Shanghai Huabang Industrial Business Network - Overvoltage absorber

[Overvoltage absorber]GS10-10 type overvoltage absorber

2026-6-14 11:11:06

GS10-10 type overvoltage absorber

[Overvoltage absorber]SOWM,SOWF series coupling capacitors for testing

2026-6-14 10:59:17

SOWM, SOWF series coupling capacitors for testing

[Overvoltage absorber]GS6-6,GS6-10 type overvoltage absorber

2026-6-14 10:59:06

GS6-6, GS6-10 type overvoltage absorber

[Overvoltage absorber]LGJ type three-phase dry-type overvoltage absorber

2026-6-14 10:46:14

The LGJ type dry-type overvoltage absorber is a new type of dry-type overvoltage absorber, mainly used in power plants and factory power supply systems to absorb operational overvoltages (including cut-off overvoltage, reignition overvoltage, etc.) generated by the opening and closing of vacuum switches and vacuum contactors, in order to protect the insulation of loads such as motors and transformers from overvoltage damage and maintain the safe and normal operation of electrical equipment.

Service conditions for LGJ type three-phase dry-type overvoltage absorber
1. Indoor use (customized for outdoor use, ceramic sleeve type)
2. Environmental temperature: -40 ��~+40 �� TH type -20 ��~+45 ��
3. The surrounding air humidity should not exceed 90%, and for TH type, it should be 95%
4. The air in the installation site should not contain corrosive gases or dust, and there should be no explosive dust.
5. The altitude should not exceed 3000m. If it exceeds 3000m, please choose G-type.
When the harmonic of the power grid exceeds the provisions of GB/T14549-93, Q-type products should be selected. When placing an order in areas with severe harmonics, it should be explained.

[Overvoltage absorber]LG12-0.2-100-1 Overvoltage Absorber

2026-6-14 10:46:03

LG12-0.2-100-1 Overvoltage Absorber

[Overvoltage absorber]GE-ZCB type transformer neutral point gap protection device

2026-6-13 21:15:32

The GE-ZCB type transformer neutral point gap protection device is a complete set of equipment that combines electrical equipment such as isolation switches, zinc oxide lightning arresters, discharge gaps, and current transformers. It has the characteristics of full functionality, small size, high reliability, and easy installation and commissioning. Lightning arresters and isolating switches can be combined and selected according to engineering needs. The operating mechanism of the isolation switch can be selected to use manual or electric mechanism according to engineering requirements.

The GE-ZJB type neutral point gap protection device can achieve two different operating modes of transformer neutral point grounding operation or ungrounded operation. In order to avoid damage to the transformer caused by the increase of neutral point voltage due to system failure. This product is widely used in fields such as power, metallurgy, petrochemicals, mining, and building environmental protection.
Features:
1. The GE-ZJB type neutral point gap protection device is equipped with electrical equipment such as discharge gaps and current transformers, and has the characteristics of small size, easy installation and debugging, and high reliability.
2. The GE-ZJB type neutral point gap protection device adopts a spherical discharge gap method, which has higher accuracy, less dispersion, and stable characteristics than the commonly used rod discharge gap discharge voltage. It has precise and effective connection with the lightning arrester characteristics and the main transformer, large heat capacity, and is not suitable for burning, improving the safety and effectiveness of protection.
3. The GE-ZJB type neutral point grounding gap complete set device can adopt spherical gap or rod-shaped gap. The technical parameters of the gap can be debugged in the factory or on-site.

GE-ZJB(1)

GE-ZCB type transformer neutral point gap protection device

[Overvoltage absorber]JKB-ZR Three phase composite overvoltage protector

2026-6-13 21:12:33

1�� Product Introduction

JKB-ZR three-phase composite overvoltage protector is a new generation of protection device designed to address the weak points of various current overvoltage protectors. The internal of this protector is an organic combination of zinc oxide valve plate and resistance capacitor, which combines the advantages of zinc oxide valve plate type protector and resistance capacitor absorber, and fundamentally overcomes the inevitable disadvantages of pure zinc oxide valve plate type protector and resistance capacitor absorber. It has ideal protection characteristics when system overvoltage occurs and is suitable for the protection of all medium voltage electrical equipment in 35KV and below systems.
1. When there is no overvoltage surge in the system, the protector is in an open circuit state, the capacitor is not connected to the system, and no additional grounding capacitor current is provided to the system, ensuring stable operation of the system.
2. When the amplitude of the system overvoltage is small, the resistance and capacitance work to absorb high-frequency overvoltage, providing true protection for the weak insulation equipment being protected.
3. When the overvoltage amplitude of the system is too large, the zinc oxide valve operates, releasing high amplitude energy to provide safety assurance for the protector and protected equipment under high current impact.
4. This product has a rigorous structure and innovative design. Adopting full integral sealing to ensure insulation, while having a comprehensive testing method, it solves the problem of similar domestic products being unable to be fully sealed due to the inability to conduct integral testing, without affecting surrounding electrical equipment.

2�� Model Description of JKB-ZR Three phase Composite Overvoltage Protector

3�� Product Features
The JKB-ZR three-phase composite overvoltage protector is a combination of resistance capacitance zinc oxide valve plates, which is commonly used for the protection of all inductive load equipment. It is a new generation replacement product for traditional zinc oxide type overvoltage protectors and resistance capacitance absorbers. Retaining the two main functions of traditional protectors:
1. Good response under low current surge (single lightning arrester insulation coordination is only suitable for high current surge), especially suitable for cabinet protection.
2. Provide phase protection (single lightning arrester does not have this function), especially suitable for overvoltage protection during circuit breaker (or switch) opening and closing operations.
3. Using zinc oxide valve plates to limit induced lightning and high amplitude operation overvoltage; Limit high-frequency cutoff and reignition overvoltage with resistance capacitance.
4. The large current of zinc oxide valve plate compensates for the problem of low energy absorption, unstable use, and unclear service life of the resistance capacitance absorber. The characteristic of better response with higher frequency of the resistance capacitance circuit compensates for the problem of poor response of the zinc oxide valve plate type protector to high-frequency overvoltage of the wavelet head to ensure system insulation.
5. Set up a special isolation device (non gap) to isolate the capacitor, and the capacitor will not be connected to the circuit under normal power frequency voltage of the system. Avoid affecting the normal operation of the system.
6. Adopting a fully sealed structure, it effectively prevents the protector from affecting surrounding electrical equipment and is easy to install.
7. By adopting a special circuit structure, users can conduct a comprehensive side test after the product leaves the factory to verify its reliability, without the need to separately test the resistance capacitance circuit and zinc oxide circuit.

4�� Main technical parameters of JKB-ZR three-phase composite overvoltage protector

1. JKB-ZR composite overvoltage protector substation, P-type for distribution; Motor used as Z; motor type 35kV does not distinguish between P and Z

5�� Appearance and installation dimensions

6�� Installation requirements

1. The composite overvoltage protector should be connected between the vacuum circuit breaker (or vacuum switch contactor) and the protected equipment (such as motor or transformer), as shown in the figure on the right.
2. The capacity of the parallel compensation capacitor protected by the composite overvoltage protector is 6KV and not more than 4500KVAR; 10KV not exceeding 7500kVAR; 35kV not exceeding 15000kVAR. The energy absorption capacity of inductive loads such as motors and transformers is 2000 �� s square wave 400A (approximately 100 times that of ordinary impedance capacitance absorbers), which can be applied to all conventional inductive loads.
3. The composite overvoltage protector should be installed horizontally.
4. The A, B, and C three-phase terminals of the composite overvoltage protector are respectively connected to the A, B, and C three-phase lines of the protected equipment, and the grounding terminals marked with grounding symbols must be reliably grounded.
5. The cross-sectional area of the wire connecting the composite overvoltage protection device should not be less than 10mm2. It is recommended to use a flexible wire connection during installation to reduce the tension on the composite overvoltage protector.

7�� Ordering Notice
Please specify the following information when placing an order:
Product name and model, if there are special requirements, please specify technical parameters and other requirements;
Order quantity and time.

[Overvoltage absorber]NC-BHQ Cable sheath protector

2026-6-13 19:56:03

NC-BHQ cable sheath protector

Ultra high voltage cables are often forced to reduce their transmission capacity due to the breakdown and damage of the outer protective layer caused by overvoltage of the metal sheath. In order to reduce the overvoltage of the sheath to ground and avoid the breakdown of the outer protective layer, voltage limiting devices, namely protective layer protectors, are commonly used to ensure the reliable operation of the cable. Cable protective layer protectors have gone through the evolution history from spark gaps, silicon carbide valve plate protective layer protectors, to metal oxide protective layer protectors. In recent years, due to improvements in raw material formulations and manufacturing processes, the performance of domestic metal oxide protective layer protectors is gradually improving, and compared with many protective layer protectors imported with cables from abroad, the level has reached or even exceeded.

Single core power cable protective layer overvoltage protection technology is used to prevent multi-point grounding faults of cable metal protective layer caused by lightning overvoltage and internal overvoltage. The cable sheath protector reduces the overvoltage of the sheath to ground, ensuring reliable transmission of large capacity cables.

The cable sheath protector is applied in single core power cable lines to limit the induced overvoltage on the metal sheath of the cable, ensuring that the insulation of the protective layer is not broken down by overvoltage. This product can be used in grounded cable lines and cross connected cable lines.

NC-BHQ cable sheath protector

[Overvoltage absorber]ZR20 series resistor capacitor overvoltage absorber

2026-6-13 19:47:53

ZR20 series resistor capacitor overvoltage absorber
Model:
ZR20-7.2(12)-0.10/100,ZR20-40.5-0.05/100

Introduction:
ZR20 resistor capacitor overvoltage absorber is a new high-tech product. This product is developed to meet the GB/T2900.16-1996 capacitor standard, known as the "protective capacitor", used as a high-voltage capacitor for absorbing impulse voltage. It is connected in series with a non inductive resistor and then connected between the load side of the switch and the ground. It can effectively suppress the instantaneous oscillation and high-frequency current of the operating overvoltage, making the waveform of the overvoltage slow down, the steepness and amplitude reduced. In addition, the damping effect of the resistor quickly attenuates the high-frequency oscillation. It is very effective for any type of load equipment, preventing insulation damage caused by overvoltage during operation and ensuring safe operation of electrical equipment.
content
ZR20 series resistor capacitor overvoltage absorber

1�� Product Usage
In the medium voltage field, vacuum switch equipment (such as vacuum circuit breakers, vacuum load switches, vacuum disconnectors, and vacuum reclosers) has the advantages of small size, light weight, high performance, high reliability, easy maintenance and repair, and suitability for frequent operation. Therefore, it quickly occupied the market It has been widely used in various fields, especially in the medium voltage field in China, where the majority of the switchgear used is vacuum switchgear.
However, vacuum switchgear, due to its strong arc extinguishing ability, is prone to overvoltage during operations such as current interruption, multiple flashovers, and synchronous disconnection when disconnecting loads from motors, transformers, reactors, and capacitors.
With the increasing importance of stable and safe power supply in the power system. The requirements for improving system reliability and security are becoming increasingly stringent. Overvoltage operation poses a great danger. It greatly affects the stability of the system. Reliability and safety. Therefore, it must be developed. Develop and produce new overvoltage protection devices to meet the above requirements.
The ZR20 type resistive capacitive overvoltage absorber is a brand new high-tech product that can fully meet the above requirements. This product is a specialized capacitor called a "protective capacitor" (a capacitor connected between the power line and the ground to absorb surge overvoltage), which is connected in series with a resistor and then connected between the load side of the switch and it. It can effectively suppress the instantaneous oscillation and high-frequency current of the operating overvoltage, and make the waveform of the overvoltage gentler, steeper, and lower in amplitude. In addition, the electric damping effect and rapid attenuation of frequency oscillations are used Very effective for any type of load equipment It is to prevent insulation damage to electrical equipment caused by overvoltage during operation An ideal overvoltage protection device that is essential for ensuring the safe operation of electrical appliances

2�� Product model and significance

3�� Product features
The ZR20 type resistive capacitive overvoltage absorber has passed all type tests in the National High Voltage Apparatus Quality Supervision and Inspection Center and the High Voltage Apparatus Laboratory of Xi'an High Voltage Apparatus Research Institute. This product uses a dry-type high-voltage capacitor with self-healing function, which is truly a "protective capacitor". Its insulation level fully meets the requirements of GB311.1Un and 1.5Ln for long-term operation, and there is no flashover or breakdown after 4 hours of connected operation at 2Un. Safe operation under temporary voltage (including power frequency voltage rise, resonant overvoltage, single-phase grounding short circuit, and intermittent) arc grounding overvoltage.
The ZR20 type resistor capacitor overvoltage absorber has undergone multiple overvoltage absorption performance tests in the laboratory, which have shown that it can absorb standard lightning impulse voltage after passing through the resistor capacitor overvoltage absorber. This voltage drops very low. Generally not exceeding twice the peak value of the relative ground voltage. According to the on-site test data provided in the article "Research on Vacuum Circuit Breaker Switching Parallel Reactor Test" published in the 4th issue of Guangdong Electric Power in August 2003, the circuit breaker is divided into
When the gate is connected, the overvoltage when connecting zinc oxide lightning protection is 3.48 times, and when connecting resistance capacitance overvoltage absorption, it is recommended to install resistance capacitance devices again. This device can reduce both the amplitude of overvoltage and the frequency of voltage. It can be seen that the impedance capacitance overvoltage absorber is the most ideal and effective device for protecting various electrical equipment from damage caused by overvoltage during operation
4�� Technical parameters
The technical parameters of ZR20 type resistive capacitive overvoltage absorber are listed in the following table

Note: The accepted 1mm power frequency withstand voltage is 75% of the factory test voltage.

5�� Usage conditions
1. Environmental air temperature: -20 �� -40 ��
2. Altitude:<3000M
3. Relative humidity:<95% (at 20 ��)
4. The air in the installation site should not contain chemically corrosive gases and vapors, non-conductive and explosive dust.
5. Earthquake intensity not exceeding 8 degrees
6. Rated frequency 50HZ or 60HZ
If the high-order harmonics of the system exceed the requirements of GB/T14549-93, it should be explained when ordering.
6�� Instructions for use

1. ZR20 type resistor capacitor overvoltage absorber is connected to the lower end of the current transformer of the circuit breaker outlet
The closer the protected electrical equipment is to the ground, the better the effect. For specific wiring, please refer to the wiring schematic diagram.
It is recommended that if the previous stage does not have a resistor capacitor overvoltage absorber installed, a resistor capacitor overvoltage absorber should also be installed on the incoming side of the circuit breaker.

2. The capacity of the ZR20 type resistor capacitor overvoltage absorber protection motor is 100-10000KW
The capacity of the protective transformer is 100-45000KVA, and the capacity of the protective capacitor is 1000-10000Kvar.

7�� Appearance and installation dimensions

8�� Transportation and Storage
1. ZR20 type resistive capacitive overvoltage absorber is packed and transported.
2. During transportation, it should be protected from rain, handled with care, kept upright, bumped, and dropped.
3. When stored, it should be kept in an upright position, with an air temperature range of -20 ° C to 40 ° C, and no flammable or explosive gases or corrosive chemicals are allowed.
9�� Acceptance and installation
1. Check the appearance quality of the impedance capacitance overvoltage absorber and the condition of the metal accessories.
2. Measure the capacitance, tan ��, and resistance values with an electric bridge to see if there are any changes from the factory values.
3. The 1-minute power frequency withstand voltage test shall be conducted at 75% of the factory test value, or a direct current voltage (twice the power frequency withstand voltage value) test can be used. During the experiment, single-phase voltage should be applied, and the other two phases should be grounded together with the grounding point. After the experiment is completed, it must be fully discharged until it is completely discharged.
4. It is best to use single or multiple copper wires for installation, and excessive tension should be avoided on the impedance capacitance overvoltage absorber. The cross-sectional area of the wire is 7.2KV and 12KV>4mm2.40.5KV>6mm2. The areas marked with grounding symbols should be reliably grounded, and the carrying surface of the grounding wire should also meet the above requirements. If a single-phase structure is used, the net distance between the charged bodies and the ground during installation should be 7.2KV>100mm, 12KV>125mm, and 40.5KV>325mm.
5. The resistor capacitor overvoltage absorber should be installed vertically upwards, and other installation forms should be specified when ordering.

10�� Usage and maintenance
1. The resistance capacitance overvoltage absorber is a maintenance free equipment. When it is removed or inspected after use, it must be fully discharged until it is completely discharged, otherwise it will endanger personal safety.
2. The resistance capacitance overvoltage absorber must undergo a preventive test once a year, and the withstand voltage test can use either power frequency or DC. The test voltage and acceptance test are the same. Measure the capacitance and tan values of capacitors (excluding resistance) using a bridge to compare with factory data. The manufacturing plant provides consulting services at any time. Practice has proven that accidents are caused by failure to conduct preventive tests in accordance with the requirements of this article, and therefore it is particularly emphasized that they must be carried out.

11�� Methods for diagnosing faults
The capacitance and tan values of the capacitance part of the impedance capacitance overvoltage absorber are measured using a high-precision capacitance bridge when the absorber is put into operation. When conducting preventive tests, the same bridge should be used to measure the capacitance and tan values. And compare with the previous measurement value to see if there is any change. If the capacitance of the 40.5KV product increases by 2.5% and the capacitance of 7.2KV and 12KV increases by more than 5%, it indicates that there is an internal fault in the capacitor and it should be replaced in a timely manner. If the measured tan&value increases significantly, it should also be replaced.
When conditions permit, a withstand voltage test can also be conducted, using either power frequency withstand voltage or DC withstand voltage. The withstand voltage value should be the same as the acceptance test, and there should be no flashover or breakdown during the test before continuing to operate. Otherwise, it must be replaced.
12�� Ordering Notice
1. When placing an order, the voltage level and quantity of the product used must be specified.
2. Please indicate the model of the switchgear where the product is installed and the name and capacity of the protected equipment when placing an order.
3. If there are special requirements, please specify them when placing an order.

[Overvoltage absorber]FGBZ,FGBS Composite Overvoltage Protector

2026-6-13 19:38:52

The FGBZ and FGBS composite overvoltage protector is currently the most advanced overvoltage protector. It is an organic combination of resistance capacitance absorber and lightning arrester, which can effectively protect against operating overvoltage and also has lightning protection function. Widely used in motors, reactors, transformers, and distribution lines for vacuum circuit breaker operation.
This product adopts a four-star three-phase combination connection method and adds a contactless self-control device. It has excellent phase to phase protection function, and at the same time, during normal operation of the power grid and single-phase grounding faults, the vulnerable capacitor part of the resistance and capacitance absorber is isolated from the power grid, avoiding the high accident rate of the resistance and capacitance absorber itself. The lightning arrester is connected to the capacitance part using a special structure, which effectively reduces the volume and makes the overall structure compact and beautiful.
The FGBZ and FGBS composite overvoltage protectors not only retain the overall technical characteristics that should be possessed by a general resistor capacitor absorber in parallel with a lightning arrester, but also have the following advantages: good phase to phase protection; There is no need to separately calculate the insulation coordination between the resistance capacitance absorber and the lightning arrester; Not affected by high-order harmonic interference from the power grid; Will not provide additional grounding capacitor current to the power grid, which is beneficial for overall electrical design; Beneficial for eliminating resonance overvoltage; Low dispersion and not affected by atmospheric conditions; A discharge action recorder can be installed to understand and monitor the operation status of the protector.

1�� Application and execution standards of FGBZ and FGBS composite overvoltage protectors
The dedicated protection equipment for overvoltage caused by vacuum switch opening and closing in AC medium voltage 3-66kV power systems is a resistance capacitance absorber, but it cannot protect against lightning and other high amplitude overvoltages. On the other hand, even with a modular design, lightning arresters still cannot achieve the ideal effect of completely preventing hazardous operating overvoltage. The product that combines the two in the correct configuration is a composite overvoltage protector (hereinafter referred to as the protector).
This protector is designed for use inside cabinets and is compatible with vacuum switches. The device combines high-frequency oscillation absorption and high amplitude valve type voltage limiting, which can effectively limit operating overvoltage and has strong lightning protection function. The composite module design eliminates the complex calculation and selection of independent design by users, greatly reducing the error rate of insulation coordination in electrical design. Adopting a four-star three-phase combination connection method, it meets the actual situation of China's power grid and has strong inter phase protection capability. Dry design, fully enclosed structure, safe and durable, compact and beautiful, effectively achieving full functionality and miniaturization.
The technical specifications for protectors are implemented according to the following standards:
GB11032-2000 "AC gapless metal oxide lightning arrester"
JB/T9672-1999 "Metal Oxide Surge Arresters with Series Gap"
GB311.1-1997 "Insulation Coordination for High Voltage Transmission and Transformation Equipment"
GB11024.1-2001 "Parallel Capacitors for Electric Power above 1kV"
GB3667-1997 "AC Motor Capacitors"
DL/T620-1997 "Overvoltage Protection and Insulation Coordination for AC Electrical Installations"

2�� Usage conditions for FGBZ and FGBS composite overvoltage protectors
*Environmental temperature: not higher than+40 ��, not lower than -40 ��;
*Altitude: not exceeding 1500m (above 1500m is a specialized high-altitude product);
*Power frequency: 50 ± 2Hz; 60 ± 2Hz;
*Seismic intensity: 7 degrees or below;
*Maximum wind speed: 35m/s;
*There is no corrosive, explosive gas or dust in the air at the installation point;
*The short-term power frequency voltage rise at the installation point shall not exceed the rated voltage of the absorber.

3�� Model Definition

[Overvoltage absorber]FURB Large capacity high-voltage current limiting fuse combination protection device

2026-6-13 19:37:14

1. Product Overview

The power branches of various electrical equipment such as transformers, mutual inductors, capacitors, etc. in the power system have a small current under normal working conditions. However, once a short circuit occurs, the impedance of the circuit is small, resulting in a particularly large short-circuit current, which will cause great difficulties in selecting disconnect protection equipment; At the same time, the traditional disconnection protection equipment has a disconnection action time of several tens of milliseconds, which cannot quickly and effectively limit the amplitude of short-circuit current. The extremely large short-circuit current will cause impact damage to the insulation of electrical equipment such as generators and transformers; In addition, higher requirements have been placed on the dynamic and thermal stability of other equipment in the system, which inevitably increases equipment investment and is unsafe.
Based on the above issues, Shanghai Songbang Electric Co., Ltd. has developed and produced a FURB high-capacity high-voltage current limiting fuse combination protection device with independent intellectual property rights. This equipment is specifically designed to solve the problems of insufficient ability to break large short-circuit currents, slow time, and lack of overvoltage protection function of traditional fuses and circuit breakers

2. Product Usage and Performance
The FURB high-capacity high-voltage current limiting fuse combination protection device is mainly suitable for circuits with large short-circuit capacity in 3-35kV power systems, such as excitation transformers, plant transformers, isolation transformers, voltage transformers, and capacitors; It can withstand frequent connection and disconnection of normal working current, and can automatically limit current and quickly and reliably disconnect and protect against overvoltage for extremely large short-circuit currents. It can also be used as phase to phase short circuit protection and backup protection for power circuits.

3. Main features of the product
The FURB high-capacity high-voltage current limiting fuse combination protection device consists of a specially designed high-voltage high breaking capacity current limiting fuse, a specially designed high-voltage high-energy zinc oxide overvoltage protector connected in parallel at both ends, and a limit signal switch combination. Once a short circuit occurs in the circuit, the high-voltage current limiting fuse quickly melts within 2mS, immediately cutting off the short-circuit current. At the same time, a specially designed high-voltage high-energy zinc oxide varistor connected in parallel at both ends of the high-voltage current limiting fuse operates to limit the operating overvoltage generated when the fuse is disconnected within the specified value, and absorbs the magnetic field energy that decays the cutoff current to zero in the system, further improving the energy absorption safety margin of the fuse; At the same time as the high-voltage current limiting fuse is opened, the limit signal switch sends an action signal, which can be connected to the load switch (or circuit breaker) for linkage or to the control room for maintenance and fault finding.
Due to the inherent ampere second characteristic of high-voltage current limiting fuses, there is no need for any external mechanical or electrical protection equipment to operate them. Therefore, the reliability of high-voltage current limiting fuses is extremely high, and there will be no refusal or misoperation. Moreover, the operating speed of high-voltage current limiting fuses is much higher than that of mechanical circuit breakers. The short-circuit current is cut off before it rises, and the current amplitude can be limited to about 15% less than the expected transient peak of the short-circuit current, with a time not exceeding 2mS. This ensures that electrical equipment such as transformers, voltage transformers, and capacitors are no longer affected by the peak short-circuit current, avoiding damage to electrical equipment caused by several cycles of high current impact; Due to the current limiting and fast nature of high-voltage current limiting fuses, I2t is very small, which can ensure that electrical equipment such as transformers, voltage transformers, and capacitors do not explode, and the busbar connection does not need to consider dynamic and thermal stability issues.

4. Main working principle of FURB high-capacity high-voltage current limiting fuse combination protection device
The high-voltage current limiting fuse combination protector mainly uses the arc voltage of the continuous current arc at the moment of fuse melting to limit and cut off short-circuit current and provide overvoltage protection. The higher the arc voltage, the better. Excessive arc voltage is a type of overvoltage that can damage the insulation of electrical equipment and expand accidents. For this purpose, we have parallel connected a specially designed high-voltage high-energy zinc oxide varistor FR at both ends of FU, and its volt ampere characteristics are shown in Figure 2. As shown in the figure, when the voltage at both ends of FR rises to the set value, FR automatically switches from cutoff to conduction, limiting the overvoltage of FU and preventing it from damaging the equipment insulation. At the same time, FR conduction reduces the energy absorbed by FU through shunt. In short, parallel FR makes the operation of the protector safer and more reliable.

Figure 1 Schematic diagram 2 Voltage current characteristics of zinc oxide varistor

FURB high-capacity high-voltage current limiting fuse combination protection device

[Overvoltage absorber]MS type single/three-phase power module surge protector

2026-6-13 19:31:22

Single/three-phase power module surge protector
B. C and D level protection, limited voltage power supply SPDB level adopts multi-stage pressure-sensitive embedded parallel technology, modular structure C and D levels adopt separate unit structure, composed of a base and pluggable protection modules, discharge current Imax: 40, 60, 80, 120 and 160kA (8/20 µ S) visual fault indication window, the working status is clear at a glance, and remote signaling contacts can be selected to achieve remote monitoring. 1-2 standard module widths, 35mm DIN rail installation can be installed in the main distribution box or floor distribution box

MS40M MS60/80/100/120/160M

Product Model	MS40M	MS80M	MS120M
Maximum continuous operating voltage (AC):	385V
Nominal discharge current 8/20 �� s	20KA	40KA	sixty
Maximum discharge current 8/20 �� s	40kA	80kA	one hundred and twenty
Voltage protection level UP	��1.8KV	��2.8KV	��3.0KV
protected mode	L-N-PE(3+1) L-N-PE(3+1)
Module width	A standard module width	Two standard module widths	Two standard module widths
remark

MS type single/three-phase power module surge protector

[Overvoltage absorber]MS single-phase power box type surge protector

2026-6-13 19:31:13

MS type single-phase power box surge protector

Product Model	MS20-1L	MS40-1L	MS60-1L	MS80-1L
Working voltage (AC)	L-N ��220V
Maximum continuous operating voltage (AC):	385V
Nominal discharge current 8/20 �� s	10KA	20KA	30KA	40KA
Maximum discharge current 8/20 �� s	20kA	40kA	60kA	80kA
Limit voltage 8/20 �� s 3KA	��1.0KV
Voltage protection level UP	��1.2KV	��1.7KV	��2.2KV	��2.7KV
protected mode	L-N��N-PE��L-PE
quality	8KG	9KG	9.5KG	11KG

Phase power (integrated) box type surge protector

Product Model	MS20B-1L	MS40B-1L	MS60B-1L	MS80B-1L
Working voltage (AC)	L-N ��220V
Maximum continuous operating voltage (AC):	385V
Nominal discharge current 8/20 �� s	10KA	20KA	30KA	40KA
Maximum discharge current 8/20 �� s	20kA	40kA	60kA	80kA
Limit voltage 8/20 �� s 3KA	��1.0KV
Voltage protection level UP	��1.2KV	��1.5KV	��2KV	��2.5KV
protected mode	L-N��N-PE��L-PE
quality	4KG	5KG	5.5KG	6.2KG

MS type single-phase power box surge protector

[Overvoltage absorber]MS type three-phase power box surge protector

2026-6-13 19:31:04

Integrated power box type surge protector

The MS type three-phase power box surge protector adopts a comprehensive protection mode of common mode and differential mode, equipped with normal/deteriorated status indicator lights and optional remote signaling contacts to achieve remote monitoring with overvoltage automatic counting function. It is suitable for various power supply systems and has multiple discharge currents to choose from according to different installation environments

Product Model	MS40B	MS60B	MS80B	MS120B
Working voltage (AC)	L-N ��220V
Maximum continuous operating voltage (AC):	385V
Nominal discharge current 8/20 �� s	20KA	30KA	40KA	60KA
Maximum discharge current 8/20 �� s	40kA	60kA	80kA	120kA
Voltage protection level UP	��1.7KV	��2.2KV	��2.7KV	��3.0KV
protected mode	L-N-PE(3+1)
quality	6KG	6.5KG	7KG	8KG

Modular power box surge protector

Using Mingshi's high-quality modular products, the box is made of high-quality steel for easy testing and replacement. It is maintenance free, easy to operate, and easy to install with load overcurrent, overheating, and failure separation devices to avoid short circuits and fire accidents. The components inside the box are connected using specially designed multi-layer copper bars, with a compact structure and equipped with normal working status/fault alarms and automatic overvoltage counting. Single phase/three-phase can be selected according to different installation environments based on the power supply system. There are multiple discharge currents to choose from

Product Model	MS40	MS60	MS80	MS100
Working voltage (AC)	L-N ��220V
Maximum continuous operating voltage (AC):	385V
Nominal discharge current 8/20 �� s	20KA	30KA	40KA	50KA
Maximum discharge current 8/20 �� s	40kA	60kA	80kA	100kA
Voltage protection level UP	��1.7KV	��2.2KV	��2.7KV	��3.0KV
protected mode	L-N-PE(3+1) L-N-PE(3+1)
quality	8KG	9KG	10KG	11KG

Product Model	MS120	MS160	MS200-100A
Working voltage (AC)	L-N ��220V
Maximum continuous operating voltage (AC):	385V
Nominal discharge current 8/20 �� s	60KA	80KA	100KA
Maximum discharge current 8/20 �� s	120kA	160kA	200kA
Voltage protection level UP	��3.0KV	��4.0KV	��1.8KV
protected mode	L-N-PE(3+1)
quality	11KG	12KG	10KG
quality	11KG	12KG	Load current: 100A

MS type three-phase power box surge protector

[Overvoltage absorber]ZR-TBP-35KV Overvoltage Resistive Capacitive Absorber

2026-6-13 19:26:59

The ZR-TBP-35KV overvoltage resistance capacitance absorber not only retains the phase to phase protection function of the TBP-35KV three-phase combination lightning arrester, but also enhances the system's ability to absorb overvoltage.

[Overvoltage absorber]TBP-150 type motor (neutral point) protector

2026-6-13 19:17:46

TBP-150 motor (neutral point) protector

[Overvoltage absorber]LCG Brake lever

2026-6-13 19:13:56

LCG brake lever

[Overvoltage absorber]LH type cable sheath protector

2026-6-13 19:13:04

LH type cable sheath protector (LH)

Medium and high voltage cables are often forced to reduce their transmission capacity due to the breakdown and damage of the outer protective layer caused by the induced voltage of the metal sheath.
In order to reduce the overvoltage of the sheath to ground and avoid the breakdown of the outer protective layer, a protective layer protector is commonly used to limit the voltage and ensure the reliable operation of the cable.

The LH cable sheath protector is applied in single core power cable lines to limit the induced overvoltage on the metal sheath of the cable, ensuring that the insulation of the protective layer is not broken down by overvoltage. This product can be used in grounded cable lines and cross connected cable lines.

Typical technical parameters table of LH cable sheath protector

Product Model	System nominal voltage (kV)	10kA lightning residual voltage (kV) peak value (Not greater than)	power frequency withstand Voltage/Time (kV)/s	DC 1-minute reference voltage (kV) (Not less than)	0.75 leakage current ��A�� (Not greater than)	200 �� s square wave current capacity ��A��
LH-10-I LU��JS��-10-I	ten	six point five	3/2	three point two five	fifty	six hundred
LH-35-I LU��JS��-35-I	thirty-five	six point five	5/3	three point two five	fifty	six hundred
LH-110-I LU��JS��-110-I	one hundred and ten	ten	5/4	five point five	fifty	six hundred
LH-110-�� LU��JS��-110-��	one hundred and ten	twenty	10/4	eleven	fifty	six hundred
LH-220-�� LU��JS��-220-��	two hundred and twenty	thirty	16/3	seventeen	fifty	six hundred

Note: JS means with counter

[Overvoltage absorber]ZRC series three-phase combined resistance capacitance absorber

2026-6-13 19:12:55

Overview of ZRC series three-phase combined resistance capacitance absorber:

The specialized protective device for overvoltage caused by the opening and closing of vacuum switches is the resistance capacitance absorber (also known as RC protector). In developed countries such as the United States and Japan, the combination of vacuum switches and resistance capacitance absorbers is a common usage method. Due to the unique characteristics of China's medium voltage (3-66kV) power grid, both imported resistance and capacitance absorption devices and domestically produced resistance and capacitance absorbers produced according to foreign standards are unable to adapt to the actual situation in China, resulting in frequent unexplained damage accidents. This has resulted in the development speed of the product being far behind that of vacuum switches in China.

But after entering 2002, with the theoretical improvement of resistance capacitance protection in medium voltage systems, the key factors causing problems were identified. At present, the resistance capacitance absorbers used in domestic power grids, produced according to the principle of correct coordination, have completely eliminated the troubles of accidents, greatly improved safety, and revitalized the product with strong vitality.
This product is a high-frequency oscillation absorption device with fast response and good response to small currents, achieving ideal compatibility with vacuum discharge tubes. Not providing additional grounding capacitor current to the power grid, designed for easy use. Adopting a four-star three-phase combination connection method, it meets the actual situation of China's power grid and has strong inter phase protection capability. Dry design, safe and durable, compact and beautiful.
Purpose and execution standards:
This product is used in AC medium voltage 3-66kV power systems, inside cabinets, and is matched with vacuum switches to absorb the current interruption overvoltage and multiple reignition overvoltage generated by the opening and closing of vacuum switches. It cannot be used for lightning protection, nor can it be used for long-term absorption of high-order harmonics in the system. Parallel use with lightning arresters yields better results.
Due to the particularity of domestic medium voltage power grids, this product does not comply with relevant foreign standards. The product technical specifications are implemented in accordance with GB311.1-1997 "Insulation Coordination of High Voltage Transmission and Transformation Equipment", GB11024.1-2001 "Parallel Capacitors for Power above 1kV", and GB3667-1997 "AC Motor Capacitors" standards. For important parameter configurations not explicitly defined in the above standards, they shall be revised and implemented in accordance with DL/T620-1997 "Overvoltage Protection and Insulation Configuration of AC Electrical Equipment".

ZRC series three-phase combined resistance capacitance absorber usage conditions:
The normal usage conditions of the product are as follows:
*Environmental temperature: not higher than+40 ��, not lower than -40 ��;
*Altitude: not exceeding 1500m (above 1500m is a specialized high-altitude product)
*Power frequency: 50 ± 2Hz; 60 ± 2Hz;
*Seismic intensity: below 7 degrees;
*Maximum wind speed: 35m/s;
*The short-term power frequency voltage rise at the installation point shall not exceed the rated voltage of the absorber.

Model definition:
The ZRC series three-phase combined resistance capacitance absorber is a high-tech product with no universal definition rules. Each production enterprise defines the model according to its own product characteristics. The product model is defined as follows:

[Overvoltage absorber]TBP-6kV Indoor Overvoltage Protector

2026-6-13 19:08:50

Main technical parameters of TBP-6kV indoor overvoltage protector

Table 1

TBP-A series (electric motor type)
Rated voltage of electric motor (kV)	valid value	six point three	ten point five
Rated voltage of protector (kV)		seven point six	twelve point seven
The power frequency discharge voltage shall not be less than (kV)		fifteen	twenty-five
DC U1mA reference voltage not less than (kV)	peak	eleven point two	eighteen point six
1.2/50 �� s impulse discharge voltage not exceeding (kV)		seventeen	twenty-nine
100A operation impulse current residual voltage not exceeding (kV)		thirteen point six	twenty-three
500A lightning impulse current residual voltage not exceeding (kV)		seventeen	twenty-nine
2000 �� s square wave impulse current (A)		four hundred	four hundred
The safe net distance shall not be less than (mm)		ninety-five	one hundred and twenty
Crawling distance along the surface shall not be less than (mm)		one hundred and forty	two hundred and thirty-five
Minimum phase to phase distance (mm)		one hundred and fifteen	one hundred and forty-five

Table 2

TBP-B series (vacuum circuit breaker, switch type)
Rated voltage of the system (kV)	valid value	six	ten	thirty-five
Rated voltage of protector (kV)	valid value	seven point six	twelve point seven	forty-two
The power frequency discharge voltage shall not be less than (kV)	peak	sixteen	twenty-six	eighty
DC U1mA reference voltage not less than (kV)		fourteen point four	twenty-four	seventy-three
1.2/50 �� s impulse discharge voltage not exceeding (kV)		twenty-four	forty-one	ninety-nine
500A lightning impulse current residual voltage not exceeding (kV)		nineteen	thirty-two	one hundred and twenty-four
2000 �� s square wave impulse current (A)		four hundred	four hundred	four hundred
The safe net distance shall not be less than (mm)		ninety-five	one hundred and twenty	two hundred and eighty-five
Crawling distance along the surface shall not be less than (mm)		one hundred and forty	two hundred and thirty-five	one thousand and twenty
Minimum phase to phase distance (mm)		one hundred and fifteen	one hundred and forty-five	four hundred and seventy

Table 3

TBP-C series (capacitor type)
Rated voltage of the system (kV)	valid value	six	ten	thirty-five
Rated voltage of protector (kV)	valid value	seven point six	twelve point seven	forty-two
The power frequency discharge voltage shall not be less than (kV)	peak	sixteen	twenty-six	eighty
DC U1mA reference voltage not less than (kV)		fourteen point four	twenty-four	seventy-three
500A operation impulse current residual voltage is not significant (kV)		nineteen	thirty-two	ninety-nine
5KA lightning impulse current residual voltage not exceeding (kV)		twenty-four	forty-one	one hundred and twenty-four
2000 �� s square wave impulse current (A)		four hundred	four hundred	four hundred
The safe net distance shall not be less than (mm)		ninety-five	one hundred and twenty	two hundred and eighty-five
Crawling distance along the surface shall not be less than (mm)		one hundred and forty	two hundred and thirty-five	one thousand and twenty
Minimum phase to phase distance (mm)		one hundred and fifteen	one hundred and forty-five	four hundred and seventy

Table 4

TBP-O series (motor neutral point type)
Rated voltage of protector Effective value (kV)	Rated voltage of motor Effective value (kV)	8/20 �� s lightning impulse current residual voltage Peak value not exceeding (kV)	DC U1mA reference voltage Peak value not less than (kV)
four point eight	six point three	twelve	six point eight
eight	ten point five	nineteen	eleven point four

TBP-6kV Indoor Overvoltage Protector

[Overvoltage absorber]LGQ series resistor capacitor overvoltage absorber

2026-6-13 18:58:06

The LGQ series resistor capacitor overvoltage absorber is suitable for use as a vacuum switch supporting device in AC 50HZ, 3KV, 5KV, and 35KV high-voltage switchgear. It is used to absorb the operating overvoltage and indoor intrusion lightning impulse overvoltage waves during switch opening and closing, and to protect electrical equipment such as motors, transformers, and switches.
Normal operating conditions for the impedance capacitance absorber:
1. The altitude shall not exceed 2500m
2. The ambient air temperature should not exceed+45 �� and should not be lower than -5 ��.
3. The relative humidity of the air should not exceed 90 ��.
4. Indoor use. Vertical installation. The inclination shall not exceed 5 degrees.
5. The distortion rate of the power grid voltage should not exceed 35KV �� 3%
3KV;5KV; 10KV��4%

Execution standards:
GB311.1-1997 Insulation Coordination for High Voltage Transmission and Transformation Equipment.
CB/T11024.1~4-2001 Parallel capacitors for AC power systems with standard voltage above 1KV

The main technical parameters of the LGQ series resistor capacitor overvoltage absorber are shown in the table:

1. Capacitors are allowed to have a deviation of ± 10%
2. Tangent value of capacitor loss angle (excluding resistance) �� 0.04%
3. The allowable resistance value is ± 10%
Model and basic parameters:
The model and meaning of the resistance capacitance absorber are as follows:

Structure, external dimensions, and wiring:
Structure:
The housing of the LGQ series resistor capacitor overvoltage absorber is made of SMC material, and the capacitor is made of high-quality polypropylene film as the solid medium, sealed and filled with flame-retardant polyurethane. The product has stable and reliable performance, and is equipped with a woven non inductive resistor with good heat dissipation performance.
The external dimensions are shown in Figure 1-4, and the wiring is shown in Figure 5

Usage, Inspection, and Maintenance:
1. The impedance capacitance overvoltage absorber should be installed vertically with a slope not exceeding 5 degrees, and it is recommended to be connected near the protected equipment, as shown in Figure 5
When the impedance capacitance overvoltage absorber is out of operation, it should be fully discharged and maintenance can only be carried out when the remaining voltage is below 40V.
3. The resistor capacitor overvoltage absorber should be inspected regularly at least once a year to determine if it is functioning properly. The method of inspection is as follows:
Before putting the impedance capacitance overvoltage absorber into operation, measure its capacity value and loss tangent value with a bridge, and record the measurement frequency and results.
When inspecting the resistance capacitance absorber after power outage or discharge, the same bridge and measurement frequency should be used to measure the capacitance value and loss tangent value. If it is found that the capacitance of the 3KV, 6KV, and 10KV resistance capacitance overvoltage absorber increases by 10%, and the capacitance of the 35KV resistance capacitance overvoltage absorber increases by 3%, the loss tangent value increases by 0.1%, indicating that there is an internal fault in the capacitor and it should be replaced in a timely manner.
4. During the factory withstand voltage test of the impedance capacitance overvoltage absorber, the test voltage shall be 75% of the value specified in Table 1.
5. As this product is designed for all working conditions, it is resistant to moisture and dirt, and only requires regular surface cleaning treatment.

LGQ series resistor capacitor overvoltage absorber

[Overvoltage absorber]HD,TBP-35kV( Outdoor overvoltage protector

2026-6-13 18:37:43

Protector model	System voltage KV	Continuous operating voltage KV	Direct current (UImA) reference voltage KV not less than	Lightning impulse residual voltage KV	2000 �� S square wave impulse current (A)
HD��TBP-B-35KV	thirty-five	forty point eight	seventy-three	one hundred and thirty-four	four hundred
HD��TBP-C-35KV	thirty-five	forty point eight	seventy	one hundred and thirty-four	four hundred

HD, TBP-35kV (outdoor) overvoltage protector

[Overvoltage absorber]HD,TBP-35kV Indoor overvoltage protector

2026-6-13 18:37:34

Protector model	System voltage KV	Continuous operating voltage KV	Direct current (UImA) reference voltage KV not less than	Lightning impulse residual voltage KV	2000 �� S square wave impulse current (A)
HD��TBP-B-35KV	thirty-five	forty point eight	seventy-three	one hundred and thirty-four	four hundred
HD��TBP-C-35KV	thirty-five	forty point eight	seventy	one hundred and thirty-four	four hundred

HD, TBP-35kV (indoor) overvoltage protector

[Overvoltage absorber]HD,TBP-3~10kV Outdoor Overvoltage Protector

2026-6-13 18:37:26

Protector model	System voltage kV	Continuous operating voltage kV	DC (U1mA) reference voltage kV not less than	Lightning impulse residual voltage kV	2000us square wave impulse current (A)
HD, TBP-A type		three point two	five point seven	nine point five	four hundred
		six point three	eleven point three	nineteen	four hundred
		ten point five	eighteen point nine	thirty-one	four hundred
HD, TBP-B type	three	four	seven point five	seventeen	four hundred
	six	eight	sixteen	thirty	four hundred
	ten	thirteen point six	sixteen	thirty	four hundred
HD, TBP-C type	three	four	seven point two	thirteen point five	four hundred
	six	eight	thirteen point eight	twenty-seven	four hundred
	ten	thirteen point six	twenty-four	forty-five	four hundred
HD, TBP-O type		three point one five	three point four	six	four hundred
		six point three	six point nine	twelve	four hundred
		ten point five	eleven point three	nineteen	four hundred

HD, TBP-3~10kV (outdoor) overvoltage protector

[Overvoltage absorber]TBP Medium high voltage combined overvoltage protector

2026-6-13 18:30:18

The TBP medium and high voltage combined overvoltage protector is a product that has been researched and developed for many years, integrating the advantages of domestic and foreign peers. In the 1990s, it was launched as the smallest, lightest, best sealed, and superior overvoltage protector in China.

The three-phase combined overvoltage protector, also known as TBP, is a new type of overvoltage protector that replaces traditional lightning arresters. It can reliably protect the protected electrical equipment from phase to ground and phase to phase overvoltage, protecting the insulation of the protected equipment from damage caused by lightning and operation overvoltage. It is incomparable to ordinary zinc oxide lightning arresters.

Selection:
Users can choose corresponding overvoltage protectors according to the different protected electrical equipment, with voltage levels including 380V, 3kV, 6kV, 10kV, 35kV and other specifications and applications for users to choose from.

Structural characteristics and installation dimensions of TBP high-voltage combined overvoltage protector:
This product structure adopts a four-star connection method, and overvoltage protectors A, B, C, and D are respectively led by high-voltage cables, greatly reducing the phase to phase distance. Due to the use of a symmetrical structure, any three of them can be connected to phases A, B, and C respectively, with the other phase grounded.

6-35kV wiring diagram:
Purpose:
TBP medium and high voltage combined overvoltage protectors are mainly used in power plants and factory electrical systems to protect electrical equipment such as transformer switches, busbars, motors, generators, lines, and capacitor banks, limit atmospheric and operational overvoltages, and provide reliable protection for electrical equipment.

Main parameters of overvoltage protector: [No W for indoor type, W for outdoor type]

Product Model	protected object rated voltage kV (Effective value)	protector rated voltage kV (Effective value)	Nominal placement electric current Lower residual pressure kV	2ms square wave inrush current tolerance A	protected object	drawing number
TBP-0.5	zero point three eight	zero point five			Gas stations, electrical equipment	one
TBP-A-3.8F	three point one five	three point eight	nine point five	two hundred	electric motor	two
TBP-A-7.6F	six point three	seven point six	twenty-five	two hundred
TBP-A-12.7F	ten point five	twelve point seven	forty-one point five	two hundred
TBP-B-7.6F	six	seven point six	twenty-five	four hundred	Generator, Transformer Voltage regulator, busbar Switches and circuits
TBP-B-12.7F	ten	twelve point seven	forty-one point five	four hundred
TBP-B-42F/200	thirty-five	forty-two	one hundred and sixty	four hundred
TBP-B-42F/400WE	thirty-five	forty-two	one hundred and sixty	four hundred		three
TBP-C-3.8F	three	three point eight	nine point five	four hundred	capacitor	two
TBP-C-7.6F	six	seven point six	twenty-seven	four hundred
TBP-C-12.7F	ten	twelve point seven	forty-five	four hundred
TBP-C-42F/200	thirty-five	forty-two	one hundred and fifty	four hundred
TBP-C-42F/400WE	thirty-five	forty-two	one hundred and fifty	four hundred		three
TBP-O-4.6F	six point three	four point six	nine point five	two hundred	Neutral point of motor	two
TBP-O-7.6F	ten point five	seven point six	twenty-five	two hundred	Neutral point of motor	two

TBP medium high voltage combined overvoltage protector