Best Phase Monitoring Relays in 2026

PRODUCT NAME---Voltage Monitoring Relay; Protection function: over voltage, under voltage; Rated voltage: DC 12V/24V/36V/48V; Overvoltage regulation range: 13-17v; Undervoltage adjustment range: 10-14v; Contact capacity: 6A 250VAC (resistivity)

REAL-TIME MONITORING---The voltage monitoring relay could achieve real-time monitoring of dc overvoltage and undervoltage faults, and over-voltage, under-voltage value, and action time can be adjusted

MAIN FEATURES---The voltage monitoring relay is of 2 sets of normally open and normally closed contacts, 2 indicator lights indicate various working conditions, no additional auxiliary power supply is required

The Composition of This Product: Three-phase voltage protector, chronograph and counter are integrated in one relay.

Function: This voltage protection relay has overvoltage, undervoltage, phase loss, phase sequence and unbalanced three-phase voltage protection.

Practicality: This 3-phase voltage relay does not require an external power supply. Has practical functions: power delay, output test, etc

Product Type:Electronic Component

Item Package Dimension:10.921 Centimeters L X 9.906 Centimeters W X 3.048 Centimeters H

Country Of Origin: United States

2 INDICATOR LIGHT: Action time of over-voltage protection relay can be adjusted, 2 sets of normally open and normally closed contacts, 2 indicator lights indicate various working conditions

ADJUSTABLE: The overvoltage protector is not additional auxiliary power supply is required. Both over-voltage and under-voltage value can be adjusted

REAL-TIME MONITOR: The overvoltage undervoltage protector relay is convenient to use, real-time monitoring of dc overvoltage and undervoltage faults

Standard modular structure, guide rail type installation.

Ac/dc voltage universal, automatic identification of ac/dc voltage, no need to switch.

Built-in LCD Chinese display voltage value, fault status, setting parameters.

Product Type:Electronic Component

Item Package Dimension:10.414 Centimeters L X 9.144 Centimeters W X 3.048 Centimeters H

Country Of Origin: United States

Weight: 0.67lb

Product Dimensions: 8.00 x 8.00 x 7.00 inches

Condition: Used - Like New

3-Phase Sequence/Loss Monitor

Monitors 208-480 VAC

5 Amp SPDT Relay Output

Product Type:Electronic Component

Item Package Dimension:10.921 Centimeters L X 10.16 Centimeters W X 3.048 Centimeters H

Country Of Origin: United States

DPA51CM44 3-Phase monitoring relay features strong anti-interference performance.

Widely used in motor protection, elevator, air conditioning system, power system and other industries.

Maintain constant and efficient work of the motor.

3-phase protection for single side

Monitors for phase reversal, phase loss, unbalance % as a function of input voltage

Bright LED indicators for ON and FAULT

3-phase protection for single side

Monitors for phase reversal, phase loss, unbalance % as a function of input voltage

Bright LED indicators for ON and FAULT

Package Dimensions: 2.794 H x 10.414 L x 8.89 W (centimeters)

Package Weight: 0.25 pounds

Country of Origin : United States

22.5 mm wide

Can be digitally set and with LCD display

Fault memory that can be switched-in

3 PHASE

600 VAC

PHASE MONITORING RELAY

Small Size: 2021 Improved Version, This 3-Phase Monitoring Relay has a smaller compact size for easier and convenient use and install, and the size of the Monitoring Relay is 8.1 x 6.7 x 1.75 cm/3.1 x 2.6 x 0.6 inch, you can install it on any places around the room, saving a lot of place

Multi-functioanl: This DPA51CM44 3-Phase Monitoring Relay has a widely use on the electric filed, and it can be applied to motor protection, elevator, air conditioning system, power system and other industries, very helpful tool during daily life

Work Well: DPA51CM44 3-Phase Monitoring Relay features with strong anti-interference performance, so it helps maintain a constant and efficient work of the motor, it will provide an excellent performance during the working process

For line and single-phase voltage monitoring

Can be used on all line supplies around the world (from 160V to 690V) without an auxiliary voltage

Can be digitally set, with fault memory and with LCD display

Control for protection of persons and equipment against the consequences of reverse running.

Protection against the risk of a driving load(Phase failure).

Normal/emergency power supply switching.

Anti Interference Performance--DPA51CM44 3-Phase monitoring relay features strong anti-interference performance

Monitoring Phase Sequence--3-phase monitoring relay for phase sequence and phase loss

Detects Correct Sequence--Detects when all phases are present and have the correct sequence