3 Phase Monitoring Relay, SPDT, Phase Failure/Undervoltage/Overvoltage

3 Phase Monitoring Relay, SPDT, Phase Failure/Undervoltage/Overvoltage

Low price 3 phase voltage monitoring relay with SPDT (1 C/O) contact, used for monitoring phase failure/loss, phase sequence, phase unbalance, overvoltage and undervoltage at the rated voltage of AC 220V, 380V, 440V, 460V, or 480V 50/60Hz, LED lights indicating working state, compact size and DIN rail mounting, provide a safe protection for electric motors, air compressors, pumps and other equipment or devices.

SKU: CCHN-MR-JVR

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Delivery date: 6-25 days

Overview

Three phase monitoring relay with SPDT (1 C/O) contact, performs the monitoring functions including phase loss, phase sequence, phase unbalance, overvoltage and undervoltage in the 3 phase AC power system of 220V AC, 380V AC, 440V AC, 460V AC, or 480V AC 50/60Hz. The phase failure/voltage monitoring relay is widely applied in air compressors, electric motors, pumps, fans, air-conditioning system, blowers, lifts, elevators, cranes, refrigeration units, mining excavators and conveyors, etc.

Features

Compact size in DIN rail mounting
Three-phase monitoring of phase sequence, phase loss (phase failure), phase unbalance, overvoltage and undervoltage
Powered by the measuring circuit
Monitoring relay with 1 C/O (SPDT) contacts
5 LED lights for status indication

Specification

Model		CCHN-JVR
Measuring Circuit		3-Phase AC: L1, L2, L3
Monitoring Functions		Phase Sequence (Reversal), Phase Loss (Failure), Phase Unbalance Overvolatege, Undervoltage
Rated Voltage (line voltage) (Optional)		220V AC, 380V AC, 440V AC, 460V AC, 480V AC 50/60Hz
Voltage Setting Range (Optional)		Model Suffix	Undervoltage	Overvolatege
		Blank	-15%	+15%
		A	-10%	+10%
		B	-10%	+12.5%
		C	-12.5%	+15%
Voltage Unbalance Threshold		15% fixed
Delay Time for Undervoltage & Overvoltage		5-8s fixed
Delay Time for Phase Loss, Phase Unbalance, Phase Sequence		1-2s fixed
Reset Time		0.5s fixed
Indicator		LED indicating phase sequence, phase loss, overvolatege, undervoltage, and normal status
Output Contacts		1 C/O (SPDT or 1 Form C)
Contact Capacity		3A, 250V AC (resistive load)
Degree of Protection		IP 20
Certification		CE
Working Conditions	Operating Temperature	-25℃~65℃
	Humidity	≤85%RH, non-condensing
Mechanical Durability		1,000,000 cycles
Dielectric Strength		＞2kVAC 1min
Mounting		35mm DIN rail
Weight		110g
Dimensions (HWD)		683076mm

Wiring Diagram

Monitoring relay contacts position shown in "Power-off" condition

Dimensions (Unit: mm)

Details

Tips: Working Principle of Phase Sequence Monitoring Relay

Sampling three-phase power supply for processing, when the phase sequence of the power supply matches the phase sequence of the input of the phase sequence monitoring relay, the output of the relay is turned on, and the main control circuit of the device is turned on.

When the phase sequence of the power supply changes, the phase sequence does not match, and the output of the phase sequence monitoring relay cannot be turned on, thereby protecting the device and avoiding accidents. The other type of phase monitoring relay uses digital micro-core technology products, which can realize automatic phase sequence identification and automatic phase sequence conversion to ensure that the motor rotates in a constant phase sequence.

The three-phase power supply is connected to the U, V, W (some are R, S, T or L1, L2, L3) of the monitoring relay in sequence. The phase sequence monitoring relay generally have one normally open and one normally closed auxiliary contacts. For the connection to the control loop, the specific connection of normally open or normally closed contacts should be based on the control principle or wiring diagram. When the phase sequence is wrong or the phase is losing, the auxiliary contact of the relay acts from normally open to normally closed, and normally closed to normally open.