Monitoring Relays

ATO offers high quality single phase voltage, 3 phase voltage, DC coltage monitoring relay and SPDT DIN rail mount phase failure relay. 12V, 24V, 36V, 48V, 110V and 240V rated voltage can be chosen. As a manufacturer for more than ten years in China, we can provide you with wholesale and bulk price for monitoring relay.

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15+
Years in Relay Manufacturing

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6,000+
Relays Produced Each Month

Monitoring Relays

A monitoring relay is a protection device for phase and voltage monitoring of power system or equipment. ATO as a vendor offers high quality single phase voltage, 3 phase voltage, DC coltage monitoring relay and SPDT DIN rail mount phase failure relay. 12V, 24V, 36V, 48V, 110V and 240V rated voltage can be chosen. Monitoring relay with LCD display and keypad afford precise digital setting. Voltage monitoring relay provides reliable relay protection for motors, pumps, fans, cranes, blowers, elevators, power distribution cabinet, air-conditioning system and so on.

Single Phase Monitoring Relay

Single phase voltage monitoring relay is suitable for undervoltage and overvoltage, compact size relay with 1 CO & 1 NC contacts. It can be used in the electric motors and pumps.

3 Phase Voltage Monitoring Relay

3 phase voltage monitoring relay is used to monitor phase loss, phase sequence and voltage unbalance. Overvoltage and undervoltage in the 3-phase power supply of 208-480V AC 50 / 60Hz.

DC Voltage Monitoring Relay

DC voltage monitoring relay is applied in the DC circuit for monitoring undervoltage and overvoltage of DC cabinet and battery. Relay with 2 C/O contacts provide protection for the equipment.

SPDT DIN Rail Mount Phase Failure Relay

DIN rail mount phase failure relay with SPDT (1 C/O) contact, performs the monitoring functions including phase loss and phase sequence in the 3 phase AC power system.

Voltage Monitoring Relay Function:

The under/over voltage monitoring relay is used to automatically disconnect the circuit when the overvoltage and undervoltage in the line exceed the specified value and can automatically detect the line voltage, and it can automatically connect the circuit when the voltage in the line returns to normal, so as to protect our electricity safety.
Voltage monitoring relay provided mainly used to protect the insulation of electrical equipment such as generators, transformers, vacuum switches, busbars, and motors from damage by overvoltage. When the power supply line has overvoltage and under voltage, the voltage monitoring relay can quickly and safely cut off the circuit under continuous high-voltage impact to avoid the occurrence of accidents caused by abnormal voltage being sent to the terminal appliances.
When the voltage returns to the normal value, the monitoring relay will automatically connect the circuit within the specified time to ensure that the terminal appliances are in normal operation under unattended duty.

Wire Diagram of Voltage Monitoring Relay:

The 3 phase monitoring relay can be mounted on 35 mm DIN Rail. When the proper three phase line voltage is applied to the unit and the phase sequence is correct, the monitoring relay is energized after the restart delay is completed. For the wholesale monitoring relay, it contacts position shown in "Power-on" (Healthy) condition. If power is off or any fault occurs, the relay contacts will be opposite to the diagram. For DC power, the polarities must be correctly connected. Otherwise, the voltage monitoring relay doesn't work.