Shanghai Huabang Industrial Business Network - Phase failure relay

[Phase failure relay]APR-L Under reverse phase protection relay

2026-6-14 10:58:12

APR-L under reverse phase protection relay

Can confirm the phase sequence of the three-phase power supply to prevent motor reversal
Wiring according to the diagram can prevent the electromagnetic contactor from operating in case of phase loss
APR-L under reverse phase protection relay adopts voltage output mode independent of load current
Low voltage protection range 20%

model		APR-L,APR-LVM
rated voltage		AC(V):220,240,380,415,440,50/60Hz
Output contact		1C 10A
Indicator light action		Power on indication
longevity fate	Mechanics	5×10^6 times
	Electrical	10^5 times
Setting error		--
Return time		3 sec
power consumption		2VA
Environmental temperature for use		-10��~+55��
Environmental humidity for use		45%~85%RH
weight		Approx.130g

APR-L under reverse phase protection relay wiring diagram and timing diagram

Appearance dimension diagram of APR-L under reverse phase protection relay

APR-L under reverse phase protection relay

[Phase failure relay]XJ12 Phase failure and phase mismatch protection relay

2026-6-14 10:06:26

XJ12 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 higher 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
Other parameters can be found on the nameplate.

[Phase failure relay]XJ3-G Phase failure protection relay

2026-6-14 10:06:18

XJ3-G Phase Failure Protection Relay Technical Data

Dimensions: 83 × 45 × 112 (mm)
Contact capacity: AC: 5A 250V
Protection time: �� 2S
Number of contacts: 1D, 1H
Contact electrical lifespan: 105
Environmental temperature: -10 ��~+40 ��
Working voltage: AC: 50Hz 380V three-phase
Installation method: Vertical or horizontal screw mounting

Wiring diagram and installation (opening) dimension diagram

[Phase failure relay]DDX-1 series phase failure protection relay

2026-6-13 19:26:41

DDX-1 series phase failure protection relay

rated voltage	Negative sequence starting voltage (V)	contact form	Contact breaking capacity (VA)	Power consumption (VA/phase)
220V 380V 50Hz	Rated voltage 380V �� 25 Rated voltage 220V �� 20	1 set of dynamic combination and 1 set of dynamic disconnection	AC Circuit 450	380V	220V
				��10	��8.5

3. Installation dimensions:

4. Wiring diagram:

DDX-1 series phase failure protection relay

[Phase failure relay]DXJ Type Phase Breaker and Phase Sequence Protection Relay

2026-6-13 19:17:37

Overview:
DXJ phase failure and phase sequence protection relay are the protective gods of electric motors. Compact, sensitive, and reliable. It has a sustainable protective effect on electric motors during phase failure and misalignment, and can be widely used in forming machinery, packaging machinery, and various equipment that requires three-phase motors.

Features:
The DXJ type phase failure and phase sequence protection relay can prevent the motor from reversing due to phase sequence errors and prevent damage to the motor caused by phase failure.
Technical parameters:
Rated input voltage: three-phase 380V 50Hz
Allowable voltage fluctuation range: 85%~110% of rated voltage
Three phase imbalance �� 15%
Action time for phase interruption and phase mismatch sequence: �� 0.5S
Output control electric shock capacity: AC220V/5A COS Ø=1
AC220V/2A COS��=0.4
Power consumption: �� 3VA
Electrical lifespan: 5 × 104 cycles
Insulation resistance: �� 100M �� (DC500V)
Insulation strength "AC2000V 50Hz 1min
Weight "about 200g

Usage conditions:
Atmospheric pressure: 86~106kPa?? Temperature: -20~40 ��
Relative humidity �� 85% RH

Working principle
This relay samples the voltage from three phases A, B, and C, and determines the balance degree of the three phases through electronic circuits. When any phase in the three phases is disconnected or the phase sequence balance point is broken, the relay loses power and releases, and the indicator light is on. When it is working normally, the relay is activated and the working indicator light is off.

Overall dimensions:

Wiring method

one	two	three	four	five	six	seven	eight
A	B	C	empty	Dynamic combination		Dynamic interruption

Attention:
After connecting the motor and before starting, check if the power phase sequence is correctly connected;
Is the polarity connection of the electric motor appropriate;
Is the wiring of the electric motor, main circuit, and control circuit reliable.