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Voltage Monitoring Relay, Under/Over Voltage, 1 Phase, 110-240V AC/DC

5 out of 5 based on 4 reviews | Write a review

$115.67

Single phase voltage monitoring relay, suitable for undervoltage and overvoltage monitoring of DC 12V, AC/DC 24-48V or AC/DC 110V-240V, adjustable delay time, compact size relay with 1 CO & 1 NC contacts, real-time LCD for voltage, operation and fault status display, DIN rail mounting, high quality and low cost.

Rated Voltage *

SKU: ATO-MR-SVR1000

Qty:

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Delivery date: 6-12 days

The AC/DC voltage monitoring relay with LCD display is a multifunctional monitoring and protection device. The relay is applied in supply voltage of DC 12V, AC/DC 24-48V or AC/DC 110V-240V to protect the equipment or devices from undervoltage and overvoltage in the applications like air compressors, electric motors, pumps, fans, air-conditioning system, blowers, elevators, cranes, refrigeration equipment, laser equipment, industrial control system, etc.

Features

Powered by the measuring circuit
Compatible with AC and DC supply
LCD display and keypad afford precise digital setting
Compact size in DIN rail mounting
Adjustable overvoltage and undervoltage threshold
Independent adjustable delay time for overvoltage, undervoltage
Adjustable reset mode: automatic reset or manual reset
Monitoring relay with 1 CO + 1 NC contacts
Fault recording for the last 3 faults

Specification

Model		ATO-SVR1000/D12	ATO-SVR1000/AD48	ATO-SVR1000/AD220
Measuring Circuit		AC/DC circuit (A1+, A2-)
Monitoring Functions		Overvoltage, Undervoltage
Rated Voltage		DC 12V	AC/DC 24-48V 50/60Hz	AC/DC 110-240V 50/60Hz
Undervoltage Setting Range		DC 9-18V adjustable	AC/DC 20-80V adjustable	AC/DC 50-300V adjustable
Overvoltage Setting Range		DC 9-18V adjustable	AC/DC 20-80V adjustable	AC/DC 50-300V adjustable
Voltage Hysteresis		0.1-6.0V adjustable	0.1-30.0V adjustable	1.0-90.0V adjustable
Delay Time for Overvoltage & Undervoltage		0.1-999s adjustable
Reset Mode		Manual/Automatic/Automatic with power-on delay
Delay Time for Reset		0.1-999s adjustable
Indicator		LCD display indicating voltage, operation and fault status
Fault Records		The last 3 faults
Output Contacts		1 CO + 1 NC
Contact Capacity		6A, 250V AC (resistive load)
Degree of Protection		IP 20
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		130g
Dimensions (HWD)		804354mm

Wiring Diagram

Note:
1. Relay 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.
2. For DC power, the polarities must be correctly connected. Otherwise, the relay doesn't work.

Details

Tips: Under/Over 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.

The voltage monitoring relay is 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.

3-Phase Monitoring Relay Phase Failure & Phase Sequence Testing

In this video, we will give you a test of ATO 3-phase monitoring relay on phase failure and phase sequence, and the relay does the job at such these cases to protect the motor. In addition, this multi-purpose monitoring relay has other monitoring functions such as undervoltage, overvoltage, voltage unbalance, timer & counter.

Working Principles 3-Phase Monitoring Relay

3-phase Monitoring Relay Phase Failure and Sequence Test

In this video, the phase failure and sequence test of the 3-phase monitoring relay is introduced.

Electromagnetic Switches: Relays VS. Contactors

In this video we will try to clear the confusion many people have between relays and contactors by showing you how to tell the difference based on five criteria: Definition, Capacity, Structure, Contacts and Applications.

Relays vs Circuit Breakers: What’s the Difference

In this video, we've described the difference between a relay and a circuit breaker as well as explaining their basic working and operation by means of animation. If you find this video helpful, please LIKE it and SHARE with your friends. Don't forget to check out the purchase links above if any featured items're of your interest.

Existing reviews of Voltage Monitoring Relay, Under/Over Voltage, 1 Phase, 110-240V AC/DC

Screen display

I would like to know if the voltage value can be displayed on the screen.

From: Syrillic | Date: 02/04/2025

Was this review helpful? Yes No (0/0)

ATO Responded

Yes, the voltage value can be displayed on the screen.

Voltage relay unit monitor

Can the ATO-MR-SVR1000 unit monitor a 3-phase system at 30-40 amps at 480 volts?

From: sera | Date: 24/07/2023

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ATO Responded

ATO-MR-SVR1000 can only detect voltage, not current.
ATO-MR-SVR1000 can only pass a maximum current of 6A.

Can you suggest me a contactor to use with this voltage monitoring relay?

I bought SVR1000\AD220 to use to cut off my solar array as protection for my inverter when voltage is too high. My inverter limit is 260V DC. From the string, I get a max amperage of 18 to 20A. Can you suggest me a contactor to use with SVR1000\AD220 and the current I have?

From: Alston | Date: 24/05/2022

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ATO Responded

What is the voltage rating of your solar array system? The maximum voltage of our DC contactor coil is 220VDC, we recommend you to use this model ATO-DCCON-80A, plz see spec and price on: https://www.ato.com/80-amp-dc-contactor

What is the Aux. Power Supply voltage range?

Hi. For your DC under and overvoltage relay (ATO-MR-SVR1000), what is the Aux. Power Supply voltage range?

From: Raymond | Date: 24/11/2020

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ATO Responded

Hi, Raymond. There is no need for Aux. Power Supply, and the relay is directly connected to your circuit for using.

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