Overview Video

DC Voltage Monitoring Relay, Under/Over Voltage, 12V/24V/48V DC

4.6 out of 5 based on 3 reviews | Write a review

$105.98

DC voltage monitoring relay with 2 C/O contacts (2 Form C or DPDT) provide protection for the equipment from undervoltage and overvoltage in DC circuit 12V, 24V, 36V or 48V, adjustable trip delay time, LED indicator for working state, DIN rail mounting, compact design, good quality and low price.

Rated Voltage *

SKU: ATO-MR-DVRD

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Overview
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This voltage monitoring relay is applied in the DC circuit for monitoring undervoltage and overvoltage of DC cabinet, battery, electric control system, etc.

Features

Compact size in DIN rail mounting
DC circuit monitoring of overvoltage and undervoltage
Adjustable overvoltage and undervoltage threshold
Adjustable trip delay time
Powered by the measuring circuit
Monitoring relay with 2 C/O contacts (2 Form C or DPDT)
2 LEDs for status indication

Specification

Model		ATO-DVRD-12	ATO-DVRD-24	ATO-DVRD-36	ATO-DVRD-48
Measuring Circuit		DC circuit
Monitoring Functions		Overvoltage, Undervoltage
Rated Voltage		DC 12V	DC 24V	DC 36V	DC 48V
Voltage Setting Range	Undervoltage	10-14V	20-28V	30-42V	40-56V
	Overvoltage	13-17V	26-34V	39-51V	52-68V
Trip Delay Time		0.1-15s adjustable
Voltage Hysteresis		3-5% fixed
Indicators		LED indicators for Normal, Trip
Output Contacts		2 C/O
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
Power Consumption		≤2W
Mounting		35mm DIN rail
Weight		130g
Dimensions (HWD)		792379mm

Wiring Diagram

DC Voltage Monitor Relay Wiring Diagram

Dimensions (Unit: mm)

DC Voltage Monitor Relay Dimension

Details

Tips: Is an AC Voltage Monitoring Relay Effective?

1. The voltage monitoring relay must be able to withstand an AC voltage above 450V.
For 3-phase 380V AC, the grid voltage sometimes has 380V-450V at zero-break, the voltage monitoring relay can be tested before installation, and the relay can be directly connected to the two fire lines for more than 4 hours to confirm whether it can withstand. Of course, it can not ignore whether the voltage monitoring relay can work normally at low voltage. You can use a voltage regulator, and adjust it to about 60V for testing.

2. The voltage monitoring relay should be able to set the trip protection value according to the rated voltage of the electrical appliance to be protected.
The setting of the trip protection value must be based on the nameplate identification or instruction manual on the electrical product. Do not set it too high or too low, otherwise the performance and life of the electrical appliance will be greatly reduced or even damaged.

3. The response speed of the voltage monitoring relay should be fast.
When the voltage is abnormal, the relay can quickly cut off the power, and the sooner the better.

4. The voltage monitoring relay should be able to set the delayed closing time according to the characteristics of the electrical appliance being protected.
This is also very important, because some electrical appliances can not be powered on immediately after power failure; then the delayed closing is a better protection for electrical appliances.

User Manual:

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.

Existing reviews of DC Voltage Monitoring Relay, Under/Over Voltage, 12V/24V/48V DC

I have some questions

What wire gauge sizes do the terminals accept? (Will the terminals allow for #14 AWG wiring?) Is the relay "energized" under normal operation, or when the relay senses an out-of-range voltage (based on the adjustable setpoints)?

From: Izefia | Date: 10/10/2024

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ATO Responded

1. The terminals support a maximum of 2.5mm² wire, and the terminals allow for #14 AWG wiring, no problem.
2. Whether the relay "energized" under normal operation under normal operation, the positive/negative terminals of the relay will be connected to the monitored circuit until an overvoltage/undervoltage is detected, triggering the relay signal.

Reliable Monitoring

The continuous monitoring of DC voltage ensures real-time awareness of the electrical system's status. In the event of voltage deviations beyond the set thresholds, the relay responds promptly, providing an added layer of protection.

From: Cassian | Date: 23/11/2023

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Looking for DC voltage monitoring relay

What is the power consumption of this DC voltage monitoring relay during normal operation and when a under voltage occurrence is in?

From: Carlos | Date: 27/11/2019

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ATO Responded

The power consumption of this relay is ≤2W during normal operation, and when the under-voltage occurs, the power consumption will be smaller than this. And you can adjust the over-voltage and under-voltage threshold in the voltage setting range as you like.

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