Shanghai Huabang Industrial Business Network - Phase relay

[Phase relay]APR-V4 Under reverse phase protection relay

2026-6-14 10:58:00

APR-V4 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
This protective relay adopts a voltage output method that is independent of the load current
Low voltage protection range 20%
Three phase four wire type

model		APR-V4
rated voltage		AC(V):220,380,50/60Hz
Output contact		1C 5A
Indicator light action		TRIP-UP two indicator lights
longevity fate	Mechanics	5×10^6 times
	Electrical	10^5 times
Setting error		--
Return time		300~600 msec
power consumption		2VA
Environmental temperature for use		-10��~+55��
Environmental humidity for use		45%~85%RH
weight		Approx.130g

APR-V4 under reverse phase protection relay wiring diagram and timing diagram

Appearance dimension diagram of APR-V4 under reverse phase protection relay

APR-V4 under reverse phase protection relay

[Phase relay]APR-4,APR-4L Under reverse phase protection relay

2026-6-14 10:57:50

model		APR-4, APR-4VM	APR-4L

rated voltage		AC(V):220,240,380,415,440,480,50/60Hz	AC(V):110~480V,50/60Hz
Output contact		1C 5A
Indicator light action		Power on indication	Two indicator lights
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-4, APR-4L under reverse phase protection relay wiring diagram and timing diagram

Appearance dimension diagram of APR-4, APR-4L under reverse phase protection relay

APR-4, APR-4L under reverse phase protection relay

[Phase relay]LXB-1E Type Current Phase Comparison Relay

2026-6-14 10:01:35

The LXB-1E current phase comparison relay is used as a selection element in phase comparison bus differential protection circuits.

Technical requirements for LXB-1E current phase comparison relay
1. The rated current IH is 1A, 5A, and the rated frequency is 50-60Hz.
When Ic and Im are greater than IH and less than 30IH, the action zone is 140o~180o, with no repeated action zone.
3. The maximum sensitivity angle is 0o ± 4o, 180o ± 4o.
Under the condition of maximum sensitivity angle, when any current changes within 30IH, the starting current shall not exceed 0.5IH.
5. Under the condition of maximum sensitivity angle, when Ic, Im, is not less than IH, the action time shall not exceed 40ms.
When Ic and Im are both IH, the total power consumption of the relay shall not exceed 1.5VA.
In a DC inductive load circuit with a voltage not exceeding 220V and a current not exceeding 0.2A (time constant of 5 × 10-3S), the contact breaking capacity is 10W; in an AC circuit, it is 20VA.
The weight of the relay is approximately 2.1kg.

LXB-1E type current phase comparison relay

[Phase relay]LXB-4 Type Current Phase Comparison Relay

2026-6-14 10:01:27

1. Purpose:
The LXB-4 current phase comparison relay is used as a selection element in phase comparison type bus differential protection devices.
2. Structural characteristics
Principle of rectification type absolute value comparison formula.

3. Main technical data of LXB-4 current phase comparison relay

rated

current

Action Zone

maximum

sensitive

corner

start

current

(A)

action

time

(s)

power

consume

(VA)

Contact breakage

Open capacity

(W)

weight

(kg)

Overall dimensions

(max) Length x

width × height

(mm)

(50Hz)

Ic and Im>

In��20In

Time>140^o��180^oNo repetitive action area

0^o±

ten^o

one hundred and eighty^o

±10^o

Maximum sensitivity

Under the corner, when

Any current

In 20in

Internal changes

one point five

Ic��Im��

5A, Ic, and

Im phase

The difference is 0^oand

one hundred and eighty^o

��0.035

The current is

5A��2

DC has

Sensing circuit

fifteen

About 4

226×124

×200

4. Principle wiring diagram of LXB-4 current phase comparison relay

[Phase relay]DHC-X series phase loss and phase sequence protection relay

2026-6-13 19:41:11

The DHC X series phase loss and phase sequence protection relay is used in conjunction with an AC contactor for the phase mismatch of three-phase power supplies in AC 380V Lack of phase Motor protection against phase voltage imbalance and overvoltage/undervoltage

Adopting voltage sampling method It is independent of the power of the motor
Series products There are multiple different functions to choose from To achieve different protection purposes
Installation method of guide rail International standard installation dimensions
SMT process
Reliable performance Beautiful appearance High performance price ratio

function	DHC1X Phase sequence protector (RSTC)	DHC2X 3-phase 3-wire phase sequence protector for phase loss	DHC2X-T 3-phase 3-wire phase sequence protector for phase loss	DHC2X-N 3-phase 4-wire phase sequence protector with missing phase	DHC1X-T Phase voltage phase sequence protector (RSTB)

Phase sequence error	Immediate action	Immediate action	Immediate action	Immediate action	Immediate action
Failed to start due to phase loss	��	��	��	��	��
Phase loss and disconnection		��	��	��	��
10% overvoltage/undervoltage detection					�� Voltage fine-tuning is available
3 phases and 3 wires	��	��	��		��
3 phases and 4 wires				��
Sensitivity adjustment		10% fixed	5%~20%	5%~20%
action delay	0.1S	3S	1-10S	0.2S	1-10S
Applicable to	Phase sequence error protection. It can also be used for three-phase phase loss protection of motors that start frequently	It is a simplified version of DHC2X-T's features	Phase sequence error protection and phase loss protection for 3-phase 3-wire motors	Phase sequence error protection and phase loss protection for 3-phase 4-wire motors	Three phase imbalance, undervoltage, overvoltage, and undervoltage and overvoltage protection for each phase. And phase loss protection

[Phase relay]LXB-2A Current phase comparison relay

2026-6-13 19:16:53

LXB-2A Current Phase Comparison Relay

rated value		Angle characteristics		Starting current (A)	Action time (s)	power Consumption (VA)	Contact disconnection Capacity DC (W)	return coefficient	weight (kg)
(A)	(Hz)	rated current Action Zone	50 or 100 A Time Zone
five one	fifty	��140°	��180°	�� 0.2 times rated current	��0.035	��2	twenty	��0.035	six

LXB-2A Current Phase Comparison Relay

[Phase relay]LXB-1A Type Current Phase Comparison Relay

2026-6-13 19:16:45

LXB-1A Type Current Phase Comparison Relay

rated value			Minimum operating current (A)		Action time (ms)	contact form	Contact breaking capacity (W)	power consumption
AC voltage (V)	AC current (A)	DC voltage (V)	lz=0 Uz=0	lz=0 Uz=100V	Action time (ms)	contact form	Contact breaking capacity (W)	AC Circuit (VA)	DC circuit (W)
one hundred fifty-seven (50Hz)	five one	two hundred and twenty one hundred and ten forty-eight	2.4-2.7	7-9	When lz=0 Uz=0 When ld �� 8A �� 30	2 pairs of dynamic combination	DC inductive circuit 25W AC circuit 30VA	Each current circuit �� 1 and voltage circuit �� 0.5	220V,6 110V,4 48V,2

LXB-1A Type Current Phase Comparison Relay

[Phase relay]BXX-2 Type Phase Sequence Relay

2026-6-13 18:49:21

BXX-2 phase sequence relay is mainly used for phase sequence detection or phase failure protection. When the phase sequence is correct, the relay operates to obtain output; When the phase sequence is incorrect or any phase of the AC circuit is disconnected, the relay will lock.
2. Structure and Working Principle
The relay adopts JK-11K, H, and Q type housing, and its external dimensions, rear terminals, and installation opening diagram are shown in Appendix 3. The back terminal is shown in Figure 1.

Figure 1 Rear terminal wiring
The relay consists of a small sealed relay, bridge rectifier, integrated block, transistor, voltage regulator, resistor, capacitor and other components.
3. Technical requirements
1. Rated value
The rated line voltage of the relay is 380V, and the rated frequency is 50Hz.
2. Voltage fluctuations
The allowable fluctuation range of relay voltage is 80% to 110% of the rated value.
3. Phase sequence judgment
When the phase sequence is correct, the relay operates. When the phase sequence is incorrect, the relay locks. When any phase in the three phases is disconnected, the relay locks and the LED lights up.
4. Power consumption
The total power consumption of the three phases shall not exceed 4VA.
5. The insulation resistance should not be less than 300M ��.
6. Dielectric strength
Under standard test atmospheric conditions, the conductive circuits of the relay should be able to withstand a test voltage of 2kV (effective value) AC for 1 minute without insulation breakdown or flashover between the exposed non charged metal parts and the casing, as well as between the AC circuit and the contact circuit.
7. Contact performance
In the DC inductive (��=5ms) circuit, U �� 250V, I �� 0.2A, 30W; in the AC (cos ��=0.4) circuit, U��250V��I��0.5A�� It is 100VA.
8. The long-term allowable closing current of the contact is 1A.
The electrical lifespan of the relay is 5 × 103 times, and the mechanical lifespan is 104 times.
The weight of the relay is approximately 0.7kg.
4. Ordering Notice
Please specify the product model, name, rated line voltage, and installation method when placing an order.