Shanghai Huabang Industrial Business Network - Other relays

[Other relays]Relay for forward and reverse rotation

2026-6-14 10:58:44

TWB-NB forward and reverse relay

Featuring a 2-digit 7-segment LED digital display
Symmetrical reciprocating motion
Independent contact, capable of controlling forward or reverse rotation
Adjustable pause time in between
Adjustable operating time
It has multiple time ranges that can be combined, making it easy to use

time range		Forward/Reverse/Pause: 9.9S, 99S, 9.9M, 99M
rated voltage		100~240VAC 50/60Hz
Indicator light action		7-segment LED digital display
lose out pick up point	model	TWB-NB/TWB-YB
	Limited time 1C
	Limited time 2C	5A
	Instantaneous 1C
longevity fate	Mechanics	5×10^6 times
	Electrical	10^5 times
Return time		0.1 sec max
power consumption		3VA
Environmental temperature for use		-10��~+55��
Environmental humidity for use		45%~85%RH
weight		Approx.180g

TWB-NB forward and reverse relay wiring diagram and timing diagram

Appearance dimension diagram of TWB-NB forward and reverse relay

TWB-NB forward and reverse relay

[Other relays]G4Q-T Alternating relay

2026-6-14 10:58:34

G4Q-T Alternating Relay

Equipped with 1C contacts
Pin 3 and pin 4 are signal input terminals
After being powered on, the contacts remain in place and only switch when there is an input signal
Reset the contact after power failure

model		G4Q-T
		three-phase	single-phase
rated voltage		DC(V):24 AC(V):220,240,380,415,440,50/60Hz
Output contact		1C 5A
Indicator light action		Indication during action
longevity fate	Mechanics	5×10^6 times
	Electrical	10^5 times
Setting error		--
Return time		--
power consumption		2VA
Environmental temperature for use		-10��~+55��
Environmental humidity for use		45%~85%RH
weight		Approx.210g

G4Q-T Alternating Relay Wiring Diagram and Timing Diagram

G4Q-T Alternating Relay Appearance Dimensional Drawing

G4Q-T Alternating Relay

[Other relays]CSY Freeze defrost relay

2026-6-14 10:58:23

CSY Freeze Defrost Relay

Equipped with CMOS IC, it has high reliability and stability
Forced defrosting function during freezing
Terminate defrosting function during defrosting
Two indicator lights for freezing and defrosting, with clear and easy to monitor operation status
The time range can be specified by the customer for production

time range		12H × 30M, with a maximum duration of 24 hours, can be customized according to customer needs
rated voltage		DC(V):12,24,48 AC(V):12,24,48,110,220,240,380,415,440,50/60Hz
Indicator light action		Freezing and defrosting indicator lights
lose out pick up point	model	CSY-N/CSY-Y
	Limited time 1C	5A
	Limited time 2C
	Instantaneous 1C
longevity fate	Mechanics	5×10^6 times
	Electrical	10^5 times
Return time		0.2 sec max
power consumption		2VA
Environmental temperature for use		-10��~+55��
Environmental humidity for use		45%~85%RH
weight		Approx.210g

CSY Freeze Defrost Relay Wiring Diagram and Timing Diagram

CSY Freeze Defrost Relay Appearance Dimensional Drawing

CSY Freeze Defrost Relay

[Other relays]KJJ-1 type circuit breaker control circuit monitoring relay

2026-6-14 10:07:34

1. Application of KJJ-1 Circuit Breaker Control Circuit Monitoring Relay
In unmanned substations used to monitor the power supply for circuit breaker operation, the tripping and closing circuits are intact. When there is a malfunction in the above circuits
When there is an obstacle, a light signal can be emitted locally and an alarm signal can be sent to a distant location using an air contact.
2. Electrical principle and wiring terminal diagram
If the polarity is reversed during testing and installation, no component will be damaged within half an hour, and the positive polarity should be corrected promptly
When TWJ and HWJ are at the same time, this relay will activate and emit a signal. See the figure below.

3. Technical data of KJJ-1 circuit breaker control circuit monitoring relay
3.1 Rated voltage: 220VDC, 110VDC
3.2 Operating voltage: not exceeding 70% of the rated voltage
3.3 Return voltage: not less than 5% of rated voltage
3.4 Monitoring current for tripping and closing circuit: 10mA at rated voltage
The resistance of 3.5 TWJ and HWJ is 2.8k ��, the starting current is 8mA, and the contact breaking capacity is 220VDC, 30W.
Please refer to Appendix HK-19 for the detailed dimensions of the external openings of the 3.6 relay.

KJJ-1 type circuit breaker control circuit monitoring relay

[Other relays]YJ-80/30 oil flow relay

2026-6-14 10:04:54

YJ-80/30 oil flow relay is used to protect and supervise the operation of transformer oil pumps used in forced oil air coolers and forced oil coolers, and monitor whether the oil pumps are reversed
Check if the valve is open and if the oil flow is normal.

Working conditions:
The ambient temperature ranges from -30 �� to 45 ��.
Relative humidity: When the air temperature is+25 �� or ± 5 ��, the relative humidity should not exceed 90%. Temperature not exceeding 90 ��

[Other relays]THJ-1,2 type circuit breaker tripping and closing circuit monitoring relay

2026-6-14 10:00:53

THJ-1, The Type 2 circuit breaker tripping and closing circuit monitoring relay is used to monitor the power supply for relay operation and whether the tripping and closing circuit is intact. When a fault occurs in the above circuit, a light signal can be emitted locally. The THJ-1 type is a phase separated monitoring relay, and the THJ-2 type is a three-phase monitoring relay. When the circuit breaker is in the closed state, this relay is used to monitor the tripping circuit. When the circuit breaker is in the tripped state, this relay automatically switches to monitoring its closing circuit. When the following situations occur, this relay sends an alarm signal:

1.1 Loss of DC power supply for circuit breaker control circuit
1.2 Fault in the tripping and closing coil and its leads
1.3 Fault in auxiliary contacts of circuit breaker
1.4 The inherent fault of the relay

THJ-1, Technical data of type 2 circuit breaker tripping and closing circuit monitoring relay
2.1 Rated voltage: 220VDC, 110VDC
2.2 Operating voltage: not exceeding 70% of the rated voltage
2.3 Return voltage: not exceeding 5% of rated voltage
2.4 The monitoring current of the circuit for tripping and closing should be approximately 8mA at the rated voltage.
The contact breaking capacity of 2.5 is 220V and 30W.
3. Terminal wiring diagram of relay

[Other relays]CR-1H(T78) Industrial Control Relay

2026-6-14 9:57:38

Characteristics of CR-1H (T78) industrial control relay:
Compact structure and light weight
High current capacity
High heat resistance and extended operating voltage range
Suitable for anti-theft equipment and control
The external dimensions are 15.7 * 12.3 * 14.0

contact form	1Z (1C) 1H (1A)
contact resistance	100m�� (1A 6VDC)
Contact material
Contact material	AgSnO2
Contact load	Resistive load: 15A 14VDC


Maximum current carrying capacity
Maximum surge current	40A
Maximum switching power
Maximum switching voltage	60 VDC
Minimum load	1A 6VDC
mechanical life	1×10^seventime
electrical life	2×10^fivetime

[Other relays]TRD-N Motor starting time limiting relay

2026-6-13 21:15:50

TRD-N motor starting time limiting relay

[Other relays]ATW-Y Dedicated controller for feeding machine

2026-6-13 21:15:41

ATW-Y feeder dedicated controller

[Other relays]DRD type fuse monitoring relay

2026-6-13 19:59:27

DRD type fuse monitoring relay is used in relay protection circuits

DRD type fuse monitoring relay

[Other relays]ZZS-7G Integrated control device for monitoring and controlling the opening and closing power supply

2026-6-13 19:59:18

The ZZS-7 series comprehensive control device for opening, closing, and power monitoring is used in various automatic control circuits for DC or AC operations. It can directly control the opening and closing circuits, monitor and control the power supply, and facilitate the adjustment of closing delay and power monitoring power-off delay.

ZZS-7G Integrated Control Device for Power Supply Monitoring and Closing

[Other relays]JZ-7GY-S Port XMT Jumping and Closing Position Power Monitoring Special Relay

2026-6-13 19:59:10

This series of XMT intermediate relays is specifically designed for monitoring switch closing, tripping, power supply, and circuit breaker. This product has a very low working current and can monitor all switches and circuit breakers. The working voltage has strong universality.

Performance: Adopting high-performance sealed imported middle, moisture-proof, dustproof, uninterrupted, and highly reliable.
Accurate operating voltage, high return coefficient, no jitter, low power consumption, multiple contacts operating or returning simultaneously (100% controllability).
After the relay is activated, there is a light indicator and a power indicator.
The electrical and mechanical lifespan of relays is long.
The insulation withstand voltage level is high. The contact resistance of the contacts is small.
Good anti-interference characteristics, suitable for places with strong interference or poor power supply voltage quality.
The working current is extremely small (�� 5mA), and the working voltage range is wide from 50V to 300V (002 type) and 80V to 300V (220 type or 202 type).

JZ-7GY-S port XMT jump in position power monitoring special relay

[Other relays]JZS-7E4 Jumping and closing position monitoring power monitoring dedicated relay

2026-6-13 19:59:01

JZS-7E4 Jumping and Closing Position Monitoring Power Supply Monitoring Special Relay

[Other relays]JZS-7H type column oscillation relay

2026-6-13 19:58:43

JZS-7H type column oscillation relay

[Other relays]JZ-7 Port to Port XMS Adjustable Current Drop Type Jumping and Closing Monitoring Special Relay

2026-6-13 19:57:59

JZ-7 Port XMS Adjustable Current Voltage Drop Type Jumping and Closing Monitoring Special Relay

[Other relays]ZZS-7 Series Switching and Closing Power Supply Monitoring Integrated Control Device

2026-6-13 19:57:50

ZZS-7 series opening and closing power monitoring and comprehensive control device

[Other relays]JG-5,JG-5Q series photoelectric relay

2026-6-13 19:16:36

1. Overview:

JG-5 photoelectric relay is an electronic device used for automation control. It consists of three parts: the photoelectric relay itself, the transmitting head GTF-5, and the receiving head GTS-5. When the light beam projected by the transmitting head on the receiving head is blocked by a moving object in between, the working state of the relay changes. Therefore, it can indicate whether the workpiece being processed exists or is located. This type of photoelectric relay can be widely used in electrical transmission control systems in industries such as metallurgy, machine manufacturing, textiles, and papermaking.

2. Model parameters:
1. Power supply: AC 50HZ220V15%. (380V ± 15% available, requires separate order)
2. The relay can reliably operate within a distance of 5M between the head and receiver.
3. When the input current of the transistor amplifier is less than 30uA, the relay should not operate. When it is greater than 40uA, the relay should operate reliably.
4. This photoelectric circuit breaker provides two sets of switchable normally open and normally closed contacts, with a contact breaking capacity of DZ144 DC 100V1AJQX-4 AC 220V 3A (resistive).

JG-5, JG-5Q series photoelectric relay

[Other relays]JMX-99F type bistable relay

2026-6-13 19:15:33

Overall dimensions	39 × 30 × 20mm
contact form
(Domestic)	1H 1D
(Overseas)	1A 1B
Contact load	100A 250VAC
Contact resistance of contacts	��2.0m��
Maximum switching power	25000VA
Maximum switching voltage	500VAC
Maximum switching current	100A
mechanical life	1 × 106
electrical life	1 × 104
Coil power consumption	1W
Rated voltage of coil	9,12,24VDC
Conversion voltage Max	50%~70% rated voltage
Action Time	��20ms
Return time	��20ms
Maximum allowable voltage VDC (max) for the coil	130% rated voltage
insulation resistance	1000M�� (at 500V)
dielectric withstand
(Between contact points)	50Hz, 1500V
(Between contact coils)	50Hz, 4000V
creepage distance	8mm
impact	Stability: 10G, Strength: 100G
vibration	10~55Hz dual amplitude 1.5mm
ambient temperature	-25 ~ 70 °C
relative humidity	85% (at 40°C)
weight	33g
Model comparison	GRUNER: 704 DBJ-983

JMX-99F type bistable relay

[Other relays]JMX-94F bistable relay

2026-6-13 19:15:24

Overall dimensions	39 × 30 × 17.5mm
(Domestic)	1H 1D
(Overseas)	1A 1B
Contact load	40A. 60A. 80A/250VAC
Contact resistance of contacts	��2.0 m��
Maximum switching power	15000VA
Maximum switching voltage	300VAC
Maximum switching current	80A
mechanical life	1 × 10^six
electrical life	1 × 10^five
Coil power consumption	1W
Rated voltage of coil	9,12,24VDC
Conversion voltage Max	50%~70% rated voltage
Action Time	��20ms
Return time	��20ms
Maximum allowable voltage VDC (max) for the coil	130% rated voltage
insulation resistance	1000M�� (at 500V)
dielectric withstand
(Between contact points)	50Hz, 1500V
(Between contact coils)	50Hz, 4000V
impact	reliability��10G, intensity��100G
vibration	10 ~ 55Hz double amplitude 1.5mm
ambient temperature	-25 ~ 70 °C
relative humidity	85% (at 40°C)
weight	33g
Model comparison	GRUNER: 704 DBJ-983

JMX-94F bistable relay

[Other relays]ZJX-3A Type Shear Pin Signal Device

2026-6-13 18:49:57

ZJX-3A type shear pin signal device

[Other relays]JYB series transistor water level relay

2026-6-13 18:49:04

Main technical data of JYB series transistor water level relay

wiring diagram

Outline and installation dimension diagram

JYB series transistor water level relay

[Other relays]LSGC-1 type overcurrent breaking and closing device

2026-6-13 18:41:28

LSGC-1 type overcurrent breaking and closing device

[Other relays]YJF-2 type low-voltage load shedding device

2026-6-13 18:40:36

YJF-2 Low Voltage Load Reduction Device

[Other relays]JSY-1 Type Voltage Loss Alarm Relay

2026-6-13 18:40:18

1. Application of JSY-1 type voltage loss alarm relay

Used as an alarm component in three-phase AC voltage systems when the voltage drops sharply.

2. Characteristics
2.1 It has three structural forms;
2.2 Can distinguish between single-phase voltage loss or three-phase voltage loss;
2.3 The dynamic contact points led out by the relay can be magnetically maintained after the action;
2.4 It has manual and external reset functions;
2.5 Export can be delayed according to user needs.

3. Main technical data of JSY-1 type voltage loss alarm relay:

Rated voltage V	Rated frequency Hz	Action voltage V	Action time in milliseconds	Power consumption		Return voltage V	Auxiliary voltage V
				DC (W)	Communicating VA/Xiang
one hundred (Phase voltage 58)	fifty	10% Rated voltage: ± 0.5	0.5 times When the action value is �� 30	seven	one	forty-eight	forty-eight
						one hundred and ten	one hundred and ten
						two hundred and twenty	two hundred and twenty

JSY-1 type voltage loss alarm relay

[Other relays]JN-20 Series Reverse Current Relay

2026-6-13 18:35:03

purpose
The JN-20 series reverse current relay is used to prevent reverse current from being generated by DC power sources, such as DC motors. When used in parallel in public networks or charging batteries, the relay will activate when the direction of the power current changes.

Overview of Structure 2
The relay system is made using the principle of polarization, and it has a voltage coil and a current coil. When the current is greater than 800A, there is no current coil, and the relay is directly installed on the busbar.
Relays are divided into ten types according to their rated voltage, and the voltage coils are designed according to their rated voltage.
Relays are classified into twelve types based on their rated current, and there are three types of relay structures depending on the magnitude of the rated current.
The relay has a movable contact or a movable contact.
During installation, the shaft of the relay must be in a horizontal position with the contacts located directly above.

Technical data of JN-20 series reverse current relay
3.1 The specifications for relays are shown in Table 1

model	JN21		JN22		JN23
contact form	1. Dynamic combination	1. Dynamic interruption	1. Dynamic combination	1. Dynamic interruption	1. Dynamic combination	1. Dynamic interruption
Current specifications ��A��	6��12��25��50��100�� 150��200��300		400��600��800		one thousand and six hundred
The current specifications should be ��A��	6��12��24��30��36�� 48��50��60��110��220		6��12��24��30��36�� 48��50��60��110��220		6��12��24��30��36�� 48��50��60��110��220

The diameter of the wiring screw varies depending on the rated current (6 to 800A), as shown in Table 2

Current (A)	6��12��25��50	100��150��200��300	400��600��800
Diameter (mm)	M6	M10	M12

3.2 Action value: The relay should be able to operate when the reverse current value introduced into the relay current coil is not greater than 15% of the rated current value.
3.3 Return value: When the reverse current value entering the relay current coil is 50% of the rated current value, disconnecting the current circuit can reliably return.
In the current coil of the relay, after passing a forward surge current of 200% of the rated value for 1 second, the relay should not experience misoperation or mechanism damage.
The power consumption of the 3.5 voltage winding shall not exceed 3.5W.
When the voltage is not greater than 220V and the current is not greater than 5A, the contact breaking capacity in a DC inductive load (time constant of 5H10-3S) circuit is 100W.
When the temperature of the surrounding medium is+40 ��, the voltage coil of the relay should be able to withstand 110% of the rated voltage for a long time, and its temperature rise should not exceed 60K.
3.8 All conductive parts of the relay should withstand AC 50Hz, 1KV voltage for 1 minute without breakdown or flashover due to the dielectric strength of the casing.
The weight of the 3.9 relay is 2Kg
The appearance and installation dimensions of the 3.10 relay are shown in Figure 1, Figure 2, and Figure 3.

Figure 1 JN-21

3.10.1 JN-21 type reverse current relay is fastened to the screen board with M8 diameter screws, and its external dimensions are shown in Figure 1.
3.10.2 JN-22 type reverse current relay is connected to the cut-off of the busbar, and the outlet of the current coil is equipped with installation parts. Its external dimensions are shown in Figure 2.

Figure 2 JN-22

3.10.3 JN-23 type reverse current relay does not have a current coil and is directly installed on the busbar. Its external dimensions are shown in Figure 3. When the width of the busbar is greater than 40mm, it should be cut according to Figure 4.

Figure 3 JN-23

Figure 4: Busbar

4 Ordering Instructions
4.1 Name and model of relay.
4.2 Rated current.
4.3 Rated voltage.
4.4 Contact Form.

[Other relays]DMC-100 series magnetic lock relay

2026-6-13 18:34:55

purpose
This relay is mainly used for pulse operation. The armature of the relay has two positioning points and is a bistable component that performs various switching tasks. There is a permanent magnet between the magnetic yoke and the iron core of the relay. When the coil excitation direction is different, the magnetic field of the permanent magnet can be strengthened or weakened. Thereby changing the same breaking state of the relay.
Technical data of DMC-100 series magnetic lock relay

2.1 The classification of relay contact systems is listed in Table 1 below:

model	Number of contact points			weight
model	Dynamic combination	Dynamic interruption	transformation	relay	socket
DMC-122A			two	Not exceeding 35g	About 6g
DMC-122			two	Not exceeding 35g	About 6g
DMC-144			four	Not exceeding 35g	About 6g
DMC-160	six			Not exceeding 35g	About 6g
DMC-106		six		Not exceeding 35g	About 6g

2.2 Relay coil specifications: The rated pulse voltage is DC 6, 12, 24, and 48V.
When terminal 1 of the action coil of the relay is connected to a negative potential and terminal 4 is connected to a positive potential, the action voltage of the relay should operate within the rated voltage range of 25% -80%.
When terminal 2 of the return coil of the relay is connected to a positive potential and terminal 3 is connected to a negative potential, the return voltage of the relay should return within the rated voltage range of 15% -50%.
At rated pulse voltage, the power consumption of the relay coil should not exceed 2W.
2.6 The rated pulse voltage width of the relay shall not be less than 0.02s.
The operating time of the 2.7 relay under rated pulse voltage shall not exceed 0.02s.
When the temperature of the surrounding medium is+40 ��, the coil of the relay should be able to withstand the rated pulse voltage for a long time, and the temperature rise of the coil should not exceed 60K.
The dielectric strength of the contact spring and winding to the magnetic yoke should be able to withstand AC voltage of 50Hz and 500V, while the dielectric strength between windings should be able to withstand AC voltage of 50 or 60Hz. There should be no breakdown or flashover phenomenon after 1 minute of voltage duration.
2.10 Contact Capacity and Lifespan
2.10.1 DMC-122�� 144160106 type:
The electrical life of a resistive load with a DC voltage of 100V and a current of 0.3A is 1 million cycles.
2.10.2 DMC-122A��
When the DC voltage is 220V and the current is 0.23A, the electrical life of a resistive load is 500000 times.
When the DC voltage is 10V and the current is 5A with a resistive load, the electrical life of B is 100000 times.
The appearance and installation dimensions of the 2.11 relay are shown in the DZ-100 series relay.
3 Ordering Instructions
Please indicate when placing an order
3.1 Model and name of relay.
3.2 Quantity and delivery date of relays.
3.3 Coil voltage of relay.
Note: Currently, only DMC-122A is produced.

[Other relays]DJS-1 series trip circuit monitoring relay

2026-6-13 18:33:07

Purpose of DJS-1 series trip circuit monitoring relay:

The DJS-1/T and DJS-1/Q type trip circuit monitoring relays can continuously monitor the trip circuit in the circuit breaker. And generate an alarm for the following situations.
a) The DC power supply has disappeared.
b) The tripping coil and its leads have malfunctioned.
c) Fault in auxiliary contact of circuit breaker.
d) Monitor the malfunction of the relay itself.

DJS-1 series trip circuit monitoring relay model name:

Working Principle:
This relay consists of an electromagnetic auxiliary relay and an RC circuit that provides return delay. Connect a light emitting diode in series in the relay coil circuit, and when the trip circuit is intact, the light emitting diode will be activated (the auxiliary relay is in operation).
When the circuit breaker is in the "closed" state (see Figure 1), current flows through the light-emitting diode, auxiliary relay coil, and circuit breaker auxiliary contacts to the trip coil. Once this circuit is open or the DC power supply disappears, the auxiliary relay returns after a delay and gives an alarm signal through its contacts.
If the protective relay trips, its tripping point will short-circuit the DJS-1 relay. After a certain period of time (circuit breaker tripping time), the circuit breaker will disconnect, and its auxiliary contacts will also switch. The tripping point of the protective relay will also return and disconnect, and this relay will restore power supply through another auxiliary contact of the circuit breaker.
The auxiliary relay in this relay is in an active state during the following times:
(1) The tripping contact of the protective relay is closed until the circuit breaker trips;
(2) The auxiliary contact of the circuit breaker is switched to the tripping contact of the protective relay and disconnected.
This is achieved through an RC circuit, which delays the return of the auxiliary relay. If the circuit breaker fails, the tripping contact of the protective relay will remain closed for a longer time than the relay delay time, so DJS-1 will give an alarm signal.

Main technical parameters of DJS-1 series trip circuit monitoring relay:

4.1 Rated voltage: 220V, 110VDC.
4.2 Contact form and capacity: It has two sets of conversion contacts and one set of dynamic breaking contacts; The contact breaking capacity is DC220V, 0.4, L/R=5ms; AC220V��3A��
4.3 Delay time �� 0.3s.
4.4 The external dimensions and opening dimensions of the DJS-1/T type relay are shown in Figure 3 of the general structural system.
The external dimensions and opening dimensions of DJS-1/Q type are shown in Figure 7 of the universal structural system.
4.5 Relay Rear Wiring Diagram (see Figure 2 and Figure 3) 3 Relay Model and Meaning Relay Structure, Q represents embedded plug-in structure, T represents protruding plug-in structure. Design Number Monitoring Electromagnetic Type 4 Technical Data
4.6 Dielectric Strength
Each conductive circuit of the relay should be able to withstand an AC test voltage of 2kV (effective value), 50Hz between exposed non charged metal parts and casings, between input circuit contacts, and between different circuits for 1 minute without insulation breakdown or flashover.
4.7 Working conditions
a) The usage location does not allow explosive media, and the surrounding media should not contain corrosive metals, gases that damage insulation, or conductive media. It is not allowed to be filled with water vapor or have serious mold presence;
b) Strong vibrations and impacts are not allowed in the usage location;
c) The usage location should have facilities to defend against rain, snow, wind, and sand;
d) The usage location does not allow an external magnetic induction intensity exceeding 1.5mT.
4.8 Electrical anti-interference relays shall comply with GB7261 and GB6261 "Electrical anti-interference test for emergency protection devices of static relays".

Wiring diagram behind the relay:

DJS-1 series trip circuit monitoring relay external dimensions and opening dimensions:

The external dimensions and opening dimensions of DJS-1/T type are shown in Figure 3 of the universal structural system.
The external dimensions and opening dimensions of DJS-1/Q type are shown in Figure 7 of the universal structural system.

Ordering instructions:
5.1 Product model, name, rated voltage level, structural form, etc. (refer to Articles 3 and 4.1).
5.2 Order Quantity.
5.3 Relay matching: such as base, etc.

[Other relays]JDH-2 Motor protection relay

2026-6-13 18:32:14

Purpose:
JDH-2 motor protection relay is mainly used for the protection of small and medium-sized motors. It determines the phase of the broken wire and issues an alarm when the motor is running with a broken wire or missing phase. It can also be used for secondary line protection in power systems as a missing phase monitoring component.

Relay model name:

Working Principle:
The schematic diagram of the relay principle is as follows: (see Figure 1)
The relay measures the three-phase voltage. When one phase is missing, the relay will trigger an alarm and maintain its operating state. When the voltage returns to normal, the relay will return. If two of the three phases are disconnected or all three phases are disconnected, the relay will instantly output, but due to the loss of working power, it will return after the action.

Usage:
4.1 Installation method: A single relay is installed in a protruding manner;
4.2 Use: It should meet the working environment conditions of the product;
4.3 Maintenance: This product should be regularly inspected, starting with a visual inspection to check for any loose solder joints on the printed circuit board and any bent wires. Next, check if the DC and AC circuits are working properly.
The product should be able to work reliably under the following conditions
a) Environmental temperature: -10 �� to+50 ��;
b) Atmospheric pressure: 80kPa~110kPa;
c) Relative humidity: The average maximum relative humidity of the wettest month is 90%, and the average minimum temperature of that month is 25 ��, with no condensation on the surface. When the highest temperature is 40 ��, the average maximum relative humidity does not exceed 50%;
d) In an environment without conductive dust and corrosive gases that can damage metals and insulation;
e) In media without explosion hazard and not filled with dust (such as coal ash, abrasives, sawdust, etc.);
f) Working position: Tilt in any direction not exceeding 5 �� and without severe vibration and impact;
g) The usage location is equipped with rain, snow, wind and sand protection devices and is not filled with water vapor;
h) Places without severe mold presence;
i) Strong external magnetic induction is not allowed in the usage area.
Relay weight
The weight of the relay shall not exceed 1.25kg

Main technical parameters:
3.1 Rated voltage
a) Rated voltage: 380V, 100V
b) Rated frequency: 50Hz.
3.2 Phase indication for missing phases
After the relay is activated, it should indicate the phase of the missing phase.
3.3 The action time of the relay in the event of a phase loss action shall not exceed 50ms.
3.4 Power consumption: At rated voltage, the power consumption of the three-phase AC voltage circuit shall not exceed 5VA/phase.
3.5 Contact breaking capacity
a) DC circuit: Under the conditions of current not exceeding 1A and voltage not exceeding 250V, the external output contact can disconnect a DC inductive load of 30W with a time constant of (5ms ± 0.75ms).
b) AC circuit: Under the conditions of current not exceeding 5A and voltage not exceeding 250V, the external output contact can disconnect the load of the circuit with a power factor coso of (0.4 ± 0.1) of 250VA.
The conductive circuits of the 3.6 dielectric strength relay should be able to withstand an AC test voltage of 2kV (effective value) and 50Hz between the exposed non charged metal parts and the casing, as well as between the input circuit contacts, for a duration of 1 minute without insulation breakdown or flashover.

Wiring diagram behind the relay:
Rear wiring diagram of relay (see Figure 2)

Relay external dimensions and opening dimensions:
Structural form and external dimensions
The relay is based on a static principle and has an modular plug-in structure. The external dimensions and installation dimensions are shown in Figure 4 and Figure 8 of the protruding modular insertion structure.

Ordering instructions:
a) Product model, name, rated voltage;
b) Order quantity;
c) Supply completeness: 1 copy of product manual;
d) Relay accessories: such as base, socket, etc. (must be ordered separately)