Shanghai Huabang Industrial Business Network - power protector

[power protector]VJ-5 Digital voltage phase sequence relay

2026-6-18 14:43:06

VJ-5 voltage phase sequence multifunctional protector (three-phase AC protection relay)
Protection features:
Voltage display
Phase failure protection
Wrong phase protection
Overvoltage protection
Undervoltage protection
Timing and Counting
Fault Record
Dimensions: 80H × 40W × 54D

VJ5 digital voltage phase sequence relay is an intelligent multifunctional monitoring and protection instrument that integrates timing and counting functions with voltage display, overvoltage and undervoltage protection, phase loss protection, and phase sequence protection. It uses a powerful microprocessor chip and non-volatile storage technology, with a Chinese LCD display for intuitive display and easy operation. It can record operating parameters such as working time, working frequency, fault time, and fault frequency, display the power supply voltage in real time, and automatically cut off the power supply in case of overvoltage, undervoltage, phase loss, or phase error in the three-phase power supply, providing good protection.

VJ5 digital voltage phase sequence relay is suitable for real-time monitoring and protection of various frequently started equipment such as passenger and freight elevators, cranes, overhead cranes, and machine tools, accurately accumulating the number of equipment starts and running time. At the same time, it can monitor the power supply of the equipment, cut off the power supply in case of abnormal power supply, and record the number and cumulative time of power supply failures.

[power protector]JKBHQ-5 type overcurrent protector

2026-6-18 14:39:03

JKBHQ-5 overcurrent protector

[power protector]JKBHQ-5 three-phase power phase sequence protector

2026-6-18 14:38:54

JKBHQ-5 three-phase power phase sequence protector

[power protector]JQX-128MT three-phase power supply phase loss protector

2026-6-18 14:38:46

JQX-128MT three-phase power supply phase loss protector

[power protector]ABJ1-12W Phase failure and phase sequence protection relay

2026-6-18 14:38:29

ABJ1-12W phase failure and phase sequence protection relay

[power protector]ABJ1-14W Three phase AC protection relay

2026-6-18 14:38:18

The ABJ1 series three-phase AC protection relay (also known as three-phase power monitor, phase sequence protector, over-voltage protector, etc.) is mainly used for various fault detection of AC 50/60Hz, rated voltage below 460V, industrial three-phase 220V, 380V, 440V, 460V and other voltage levels. It provides relay protection for high voltage, low voltage, phase loss, reverse phase (phase sequence), three-phase voltage imbalance, etc. of the three-phase input power supply. The product is widely used in air compressors, electric motors, distribution boxes, water pumps, oil pumps, central air conditioning units, electrical control boxes, distribution cabinets, cranes, etc., such as central air conditioning compressor protection, power monitoring of various elevators, water pumps, oil pumps anti phase loss, reverse phase protection, etc. It is a maintenance equipment for industrial equipment operation. An essential protective product for normal working voltage.

ABJ1-14W three-phase AC protection relay complies with GB14085.5-2001 eqv IEC60947-1:1999 standard.
Warning! This product is generally used for sampling the power side of three-phase power supply and should not be installed on the output side of variable frequency current

[power protector]HYJ Three phase power supply monitor

2026-6-18 14:38:10

HYJ series voltage phase sequence multifunctional protector

1. Protection features
�� Dynamic phase loss and static phase loss protection: Refers to a delay of 2 seconds in action when any phase of the protected line experiences a phase failure, whether in operation or non operation. The form of the indicator light is: red light on and priority given;
�� Wrong phase protection: a protective measure to prevent the wrong phase sequence connection of L1, L2, and L3 three-phase AC, with a delay of 2 seconds. The indicator light form is: red light on;
�� Overvoltage protection: refers to the delay of 3-8S when the voltage of the protected circuit is higher than the set value. The indicator light form is: yellow light on;
�� Undervoltage protection: refers to the action of delaying 3-8S when the voltage of the protected line is lower than the set value. The indicator light is in the form of: yellow light on
�� Voltage imbalance protection: refers to a protective measure in which three-phase voltage imbalance will affect the safe operation of the line. When the voltage imbalance rate is greater than 10%, the action will be delayed for 2 seconds. The form of the indicator light is: the red light for phase loss is on, and priority is given.

2. Performance characteristics
�� The protection function of the protector is not affected by the current size of the line or load, the impact current, unbalanced current, and the nature of the load. Capable of long-term operation with full performance and all weather conditions. Power consumption not exceeding 10W;
�� There is no requirement for the motor wiring method when used for motor protection;
�� This product complies with GB/T 14048.1-2000, GB14048.5-2001 eqv IEC60947-1:1999;
�� The EMC of this product complies with the measurement methods and allowable values of radio interference characteristics in GB4343-1995.
3. Job characteristics
�� The three-phase wiring of L1, L2, and L3 is correct, the green light of the protector is on, and the internal relay is closed; If the phase sequence is connected incorrectly, the red light of the protector will light up. As long as any two phases of L1, L2, and L3 are exchanged, the protector can recognize the phase sequence and work normally. When the red light lights up and the internal relay does not close after the protected circuit is working normally, it should be considered as a phase sequence misconnection of the external circuit, and the protector has anti misconnection protection function;
�� When the three-phase overvoltage or undervoltage of L1, L2, and L3 occurs, the yellow light will turn on, the green light will not turn on, and the internal relay will release; When the voltage returns to normal, the green light is on and the internal relay is engaged;
�� L1, L2, and L3 are connected to three-phase AC voltage, while NO and COM are normally open contacts; NC and COM are normally closed contacts. Connect the wiring terminals directly using wires.
4. Installation method
�� The protector can be directly inserted into the 35mm TH standard installation track;
�� When installed in other situations, M2-M4 screws can be used to fix it.
5. Technical parameters
�� Environmental temperature: -25 ��~+55
�� Relative humidity:<90%
�� Contact voltage: 250VAC, 30VDC
�� Contact current: 6A
�� Dimensions: 79mm × 23mm × 79mm

[power protector]XJ11 Three phase AC protection relay

2026-6-18 14:38:01

XJ11 series voltage phase sequence multifunctional protector

1. Protection features
�� Dynamic phase loss and static phase loss protection: Refers to a delay of 2 seconds in action when any phase of the protected line experiences a phase failure, whether in operation or non operation. The form of the indicator light is: red light on and priority given;
�� Wrong phase protection: a protective measure to prevent the wrong phase sequence connection of L1, L2, and L3 three-phase AC, with a delay of 2 seconds. The indicator light form is: red light on;
�� Overvoltage protection: refers to the delay of 3-8S when the voltage of the protected circuit is higher than the set value. The indicator light form is: yellow light on;
�� Undervoltage protection: refers to the action of delaying 3-8S when the voltage of the protected line is lower than the set value. The indicator light form is: yellow light on;
�� Voltage imbalance protection: refers to a protective measure in which three-phase voltage imbalance will affect the safe operation of the line. Voltage imbalance rate=When 100% is higher than 10%, delay the action for 2 seconds. The form of the indicator light is: the red light for phase loss is on, and priority is given.
2. Performance characteristics
�� The protection function of the protector is not affected by the current size of the line or load, the impact current, unbalanced current, and the nature of the load. Capable of long-term operation with full performance and all weather conditions. Power consumption not exceeding 10W;
�� There is no requirement for the motor wiring method when used for motor protection;
�� This product complies with GB/T 14048.1-2000, GB14048.5-2001 eqv IEC60947-1:1999;
�� The EMC of this product complies with the measurement methods and allowable values of radio interference characteristics in GB4343-1995.
3. Job characteristics
�� The three-phase wiring of L1, L2, and L3 is correct, the green light of the protector is on, and the internal relay is closed; If the phase sequence is connected incorrectly, the red light of the protector will light up. As long as any two phases of L1, L2, and L3 are exchanged, the protector can recognize the phase sequence and work normally. When the red light lights up and the internal relay does not close after the protected circuit is working normally, it should be considered as a phase sequence misconnection of the external circuit, and the protector has anti misconnection protection function;
�� When the three-phase overvoltage or undervoltage of L1, L2, and L3 occurs, the yellow light will turn on, the green light will not turn on, and the internal relay will release; When the voltage returns to normal, the green light is on and the internal relay is engaged;
�� L1, L2, and L3 are connected to three-phase AC voltage, while NO and COM are normally open contacts; NC and COM are normally closed contacts. Connect the wiring terminals directly using wires.

[power protector]SVRD Single phase overvoltage and undervoltage protector

2026-6-18 14:37:53

Protection features:
Overvoltage protection
Undervoltage protection

Dimensions: 79H × 23W × 79D
Warning! This product is generally used for sampling the power side of single-phase power supplies and should not be installed on the output side of variable frequency currents!

Product Overview
The SVRD series single-phase overvoltage and undervoltage protector is mainly used for various fault detection of AC 50/60Hz, rated voltage below 250V, industrial single-phase 110V, 220V, 240V, 250V and other voltage levels. It provides relay protection for high and low voltage of single-phase input power supply. This product is an indispensable protection product for maintaining the normal working voltage of industrial equipment during operation. This product complies with the GB14048.5-2001 eqv IEC60947-1:1999 standard.

Voltage Range Selection Table

Contact form: Two open and two closed
Note: 1. Overvoltage and undervoltage protection will take about 3 seconds to activate
2. As this protector only protects against voltage and its phase sequence, it can be applied to devices of various powers.

structural characteristics
1. Installation method: The protector base adopts a guide rail type and is equipped with two M4 screw hole structures. It can be installed independently or on HT35 guide rails (if direct installation is used, the accessories on both sides of the bottom of the product need to be forcefully pushed out).
2. Indicator lights: Five indicator lights are used to indicate: normal, phase loss (voltage three-phase imbalance), reverse phase, overvoltage, undervoltage.
3. Dimensions: 79mm × 23mm × 79mm.

[power protector]DFY-6 Three phase power supply phase sequence protection counter

2026-6-18 14:37:44

The DFY-6 phase sequence protection counter is a multifunctional monitoring and protection instrument for three-phase power systems or three-phase electrical equipment. Integrating timing and counting, three-phase voltage display, overvoltage protection, undervoltage protection, phase loss protection (phase failure protection), and phase sequence protection (phase mismatch protection). Adopting Chinese LCD display, it has the characteristics of complete functions, stable performance, and easy operation.
The DFY-6 phase sequence protection counter can display the three-phase power supply voltage in real time, and can protect the contact control signal output by the circuit through relay output in case of overvoltage, undervoltage, phase loss, or phase error faults in the power supply, providing protection. It is a high-tech product that replaces traditional phase sequence relays and voltage relays.

Main functions
Display voltage: Display the current working voltage value.
Overvoltage protection: When the voltage is too high or too low, cut off the power supply of the equipment.
Phase loss protection: Cut off the power supply of the equipment when the three-phase power supply loses phase.
Wrong phase protection: Cut off the equipment power supply when the phase sequence of the three-phase power supply is incorrect.
Counting and timing: Record the number of times the device is started and the cumulative working time.
Fault record: Record the number of occurrences and cumulative time of faults.

Main technical parameters
Rated control voltage Us: phase voltage AC-220V, line voltage AC-380V
Power supply voltage error: -15%~+10%
Output contact capacity: 2A/250VAC
Working environment: Temperature -10C~50C
Humidity 85%, no condensation
Frequency: 50/60HZ
Weight: 85 grams
Data retention time: 10 years
Maximum counting capacity: 999999 times
Maximum timing capacity: 9999 hours and 59 minutes
Maximum counting speed: 5 times/second
Input signal: AC/DC voltage signal
Dimensions: 48 × 48 × 90mm (length × width × height)

Outline dimension diagram:

[power protector]DFY-5 Three phase power protection device (power phase sequence overvoltage/undervoltage protection device)

2026-6-18 14:37:36

DFY-5 power protector is a multifunctional monitoring and protection instrument for three-phase power systems or three-phase electrical equipment. Integrating three-phase voltage display, overvoltage protection, undervoltage protection, phase loss protection (phase failure protection), and phase sequence protection (phase mismatch protection). Adopting Chinese LCD display, it has the characteristics of complete functions, stable performance, and easy operation.
The DFY-5 power protector can display the three-phase power supply voltage in real time, and can provide users with alarm output and contact control signals for protection circuit action output through relay output in case of overvoltage, undervoltage, phase loss, or phase error faults in the power supply, playing an alarm and protection role. It is a high-tech product that replaces traditional phase sequence relays and voltage relays.

Main functions
Display voltage: Display the working voltage value
Overvoltage/undervoltage protection: When the voltage is too high or too low, cut off the power supply of the equipment.
Phase loss protection: Cut off the power supply of the equipment when there is a phase loss or severe imbalance in the three-phase power supply.
Phase sequence protection: Cut off the equipment power supply when the phase sequence of the three-phase power supply is incorrect.
Sound and light alarm: Sound and light prompts will occur when the above-mentioned faults occur.

Main technical parameters
Rated control voltage Us: phase voltage AC-220V, line voltage AC-380V
Power supply voltage error: -15%~+10%
Working environment: Temperature -10 ° C~50 ° C
Output contact capacity: 2A/250VAC
Frequency: 50/60HZ
Weight: 85 grams

Product dimension diagram:

Scope of application of the product
Mobile device control (on-site equipment, agricultural equipment, refrigerated trucks)
Central air conditioning unit
Oil pump
To protect personal safety and prevent reverse operation of equipment (such as lifting, transportation, elevators, escalators, etc.)
Prevent dangerous transmission loads (phase loss)
Normal/Emergency Power Switching

[power protector]MK1 series control and protection switchgear

2026-6-18 14:37:28

MK1 series control and protection switchgear
Product Overview
Shell current: 0.4A~100A
Rated working voltage: 50/60Hz, AC400V
Rated operating short-circuit breaking current: 35kA, 50kA
Derivative functions: leakage, isolation, communication, alarm unprotected
Start delay: adjustable from 0 to 99 seconds
Overcurrent protection: can be set on site
Undercurrent protection: adjustable on site, factory set to 60% Ie
Three phase unbalance (phase failure) protection: 20~75% adjustable, factory set to 75%

Product Features
It has three-stage protection including long delay, short circuit short delay, and short circuit instantaneous protection
It has functions such as phase failure, overcurrent, locked rotor, undercurrent, overvoltage, undervoltage, leakage, three-phase imbalance, isolation, and startup delay
Equipped with voltage display and current display functions;
Parameters can be set and queried
Equipped with fault memory function, convenient for fault query and maintenance;
Equipped with a 485 communication interface, it enables remote intelligent management.

Application scenarios
Widely applicable to distribution and motor protection and control systems in metallurgy, coal mining, steel, petrochemicals, ports, ships, railways and other fields; Motor Control Center (MMC); Lighting, power conversion, pumps, fans, air conditioning, fire protection, lighting and other electrical control and protection systems in modern buildings; Ports or railway systems (airports, railway passenger transport centers, etc.); Highway lighting or ventilation system; Fire pumps, fans, etc. for various occasions.

[power protector]JC- �� residual current operated protector

2026-6-18 14:37:18

Scope of application:
JC-II residual current action protector is a suitable product developed based on the renovation of rural low-voltage power grids. It provides comprehensive indirect protection and cuts off the power supply to ensure safety in the event of power grid faults such as wire falling into water or live wires. A leakage protection combination device consisting of a protector and an AC contactor is suitable for use in low-voltage (380V/200V) TT distribution systems where the neutral point of the power supply is directly grounded. It serves as the overall protection or sub protection for multi-level line protection.

[power protector]JDO/KBO series control and protection switchgear

2026-6-18 14:37:09

KBO is mainly used in power systems with AC 50Hz (6OHz), rated voltage up to 690V, and current ranging from 0.16A to 100A to connect, carry, and disconnect currents under normal conditions, including specified overload conditions, and to connect, carry, and disconnect currents under specified abnormal conditions (such as short-circuit currents).

3. Function:
KB0 adopts a modular single product structure, integrating the main functions of traditional circuit breakers (fuses), contactors, overload (or overcurrent, phase failure) protection relays, starters, isolators, etc. It has remote automatic control and local direct manual control functions, panel indication and electromechanical signal alarm functions, and coordinated time current protection characteristics (with inverse time limit, timed limit, and instantaneous three-stage protection characteristics). By selecting functional modules or accessories as needed, control and protection can be achieved for general (infrequent starting) motor loads, frequent starting motor loads, and distribution circuit loads.

Product type:
The configuration of KBO basic products is shown in Figure 1-3, and the electrical schematic of basic products is shown in Figure 1-4.
Reversible Control and Protection Switchgear KBON: Using KBO basic type as the main switch, combined with mechanical interlocking and electrical interlocking accessories, it forms a reversible control and protection switchgear, suitable for reversible or bidirectional control and protection of electric motors.
Dual power automatic transfer switch electrical appliance KBOS: Products with a rated current of 100A and below use the KB0 basic type as the main switch, combined with voltage relays, mechanical interlocks, electrical interlocks, and other accessories to form a CB level to PC level dual power automatic transfer switch electrical appliance ATSE; The ATSE with a rated current of 250A-630A is PC grade.
The pressure reducing starter KB0J, KB0J2, KB0Z, KB0R: KB0 is used as the main switch, combined with appropriate contactors, time relays, mechanical interlocks, electrical interlocks, and other accessories to form the Y-�� pressure reducing starter KB0J and the autotransformer pressure reducing starter KB0Z, which are suitable for pressure reducing starting control and protection of electric motors.
Dual speed controller KB0D: Using KB0 as the main switch, combined with appropriate contactors, mechanical interlocks, and electrical interlocks, it forms a dual speed controller suitable for starting control and protection of dual speed motors.
Three speed controller KB0D3: Using KB0 as the main switch, combined with appropriate contactors, mechanical interlocks, and electrical interlocks, it forms a dual speed controller suitable for starting control and protection of dual speed motors.
The protection control box XBK1: KB0 serves as the main switch and is installed in a standard protection box to form a power terminal box, suitable for outdoor and remote control and protection of individual loads.
Derivative types: fire protection type (F type), isolation type (G type), plug-in board wiring (R type), etc.

Applicable fields of KB0:
KBO has the advantages of functional integration, modular structure, small size, high protection level, high breaking capacity, short arcing distance, long service life, continuous operation, high reliability, and easy installation, use, and maintenance operation. It is particularly suitable for motor control and protection systems in metallurgy, coal mining, steel, petrochemicals, ports, ships, railways, and other fields. Electrical control and protection for lighting, power conversion, pumps, fans, air conditioning, etc. in modern buildings.
Motor Control Center (MCC), especially for intelligent electrical control systems or MCC with high breaking capacity requirements (such as distribution and protection systems that require Icu or Ics to reach 80kA). Single machine control and protection in factories or workshops (equivalent to power terminals).

Main parameters:
Two external dimensions (frame codes C and D respectively)
The number of poles in the main circuit is divided into three poles and four poles.
Rated current level of the main body; 12A 16A 18A 32A 45A63A 100A.
The setting current range covered by the overload release (controller) that can be equipped: minimum setting current 0.16A, maximum setting current 100A
Short circuit breaking capacity level: Economic type (C) 35kA. Standard type (Y) 50kA. High breaking type (H) 80kA
The expected breaking time under short-circuit current is 2-3ms, with a current limiting coefficient below 0.2.
Form of overload release:
According to the working principle, it can be divided into: thermal magnetic release (including basic and fire protection types, M P F L, etc.) intelligent controller
Electronic controllers are divided into motor protection and distribution protection according to the protected objects, and are classified into frequent operation and infrequent operation according to the operating frequency
C. The external dimensions and installation methods of the D-frame thermal magnetic release, intelligent controller, and electronic controller are completely consistent. (ID-357715118443535)

[power protector]BDS series single-phase three-phase common mode power supply protector

2026-6-18 14:37:00

Product Description
Single phase and three-phase common mode surge protectors are mainly used in places with severe power grid interference, which can effectively suppress peak interference and induced lightning waves in the power grid. They mainly provide comprehensive protection for the common mode and differential mode of phase lines, neutral lines to ground, and phase lines to neutral lines required by TT and TN-S distribution systems, and are used for first and second level protection.

Model Description

Product wiring diagram

BDS series single-phase three-phase common mode power supply protector