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Monitoring Relays
3 Phase Monitoring Relay, SPDT, Phase Failure/Undervoltage/Overvoltage
$98.89
SKU: ATO-MR-JVR
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.
DC Voltage Monitoring Relay, Under/Over Voltage, 12V/24V/48V DC
$105.98
SKU: ATO-MR-DVRD
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.
Voltage Monitoring Relay, Under/Over Voltage, 1 Phase, 110-240V AC/DC
$115.67
SKU: ATO-MR-SVR1000
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.
Multifunctional Monitoring Relay, Phase/Voltage, 3 Phase, 208-480V AC
$158.23
SKU: ATO-MR-JVR8002
Phase voltage monitoring relay, used for phase loss, phase sequence, voltage unbalance, overvoltage and undervoltage monitoring with 3 phase power supplied by 208-480V AC 50/60Hz, also with timer & counter function, 0.1-30s adjustable delay time, compact size relay with 1 CO + 1 NC contacts, real-time LCD display for voltage, fault and operation state, DIN rail mounting. High accuracy and favorable price.
Single Phase Voltage Monitoring Relay, 12V/24V DC, 110V/220V AC
$67.68
SKU: ATO-MR-GRV8
High-quality and affordable single phase voltage monitoring relay providing 12V/24V/48V DC and 110V/220V/240V AC, equipped with an LED indicator and high contact capacity. Specially designed for fixed overvoltage protection, the 1-phase voltage monitoring relay operates stably with a 1NO+1NC contact configuration. The small 12V DC relay reliably functions in ambient temperatures ranging from -20°C to +55°C. The single phase monitoring relay is the best choice for voltage monitoring applications.
Under/Over Voltage Monitoring Relay, LCD, 3 phase 3-wire/4-wire
$79.86
SKU: ATO-MR-GRV8S
Under/Over Voltage Monitoring Relay, equipped with an LCD display and is suitable for 3-phase 3-wire or 4-wire power systems. This voltage monitoring relay is exquisitely designed and powerful, aiming to provide reliable voltage monitoring and protection, ensuring the stable operation of the power system.
3 Phase Voltage Monitor Relay, 3-wire 127V-265V/4-wire 220V-460V
$68.39
SKU: ATO-MR-GRV810
The three-phase voltage monitoring relay has SPDT (2 C/O) contacts, accurate pressure measurement, and is suitable for quickly cutting off or connecting the circuit when the power supply voltage exceeds or falls below the set range for 3-wire AC 127V-265V/ 4-wire AC 220V-460V to ensure the safe and reliable operation of the power system. The 3-phase relay is equipped with LED lights to indicate the working status and is lightweight and easy to install.
Liquid Level Control Relay, Level Monitoring, SPDT, AC/DC 24-240V
$65.72
SKU: ATO-MR-GRL8
Liquid level control relay is a key automated liquid level monitoring component. The SPDT design of the liquid level control relay allows the relay to switch between two independent load circuits, such as pump start stop control or alarm signals, when the liquid level changes. This liquid level control relay is compatible with both AC and DC power sources, with a wide voltage range from 24V to 240V, making it suitable for most industrial power supply environments.
Current Monitoring Relay, Over/ Under Current, 1A/2A/5A/8A/16A, AC/DC24V-240V
$61.24
SKU: ATO-MR-GRI8
The current monitoring relay has 1 SPDT switch, suitable for rated voltage AC/DC 24V-240V range, with undercurrent/over current protection. The current limiting relay has an LED indicator to display the operating status, mainly used to monitor whether the current in the circuit exceeds the preset value and take corresponding measures when it exceeds the preset value. It has a built-in isolated current transformer, and an external current transformer can be connected to expand the monitoring current range. In addition, it can be flexibly adjusted through a potentiometer, with 6 current specifications to choose from.
Current Monitoring Relay, 2-20A Adjustable, AC/DC24V-240V
$68.51
SKU: ATO-MR-GRI805
Current Monitoring Relay, suitable for power sources ranging from AC 24V to 240V and DC 24V to 240V, making it applicable for diverse industrial and commercial applications. With an adjustable range from 2A to 20A, this current monitoring relay caters to a wide array of applications, ensuring stable and dependable current monitoring for both AC and DC power sources.
1-phase Current Monitoring Relay, 2-20A, 2×SPDT, AC/DC24V-240V
$70.92
SKU: ATO-MR-GRI806
The 1-phase current monitoring relay has 2×SPDT. It uses a remote current sensor to convert high current into low current for suitable measurement and protection equipment and can be connected to an external current sensor to extend the monitoring current range and penetrate the secondary current. The monitoring relay can provide an ultra-wide pressure range of AC/DC24V-240V to satisfy multiple scene requirements. Uses flame-retardant materials for added safety.
A monitoring relay is a protection device for phase and voltage monitoring of power system or equipment. The relay can be used to monitor important parameters in the power supply system including over-voltage, under-voltage, phase loss (phase failure), three-phase voltage imbalance, and phase sequence. Thus, it provides reliable relay protection for motors, pumps, fans, cranes, blowers, elevators, power distribution cabinet, air-conditioning system, and so on.
ATO.com offers a series of voltage monitoring relay for DC power, single-phase power and 3 phase power. The monitoring relay features compact size, easy to use, good performance, high reliability and favorable price. It is ideal choice for phase and voltage monitoring.
Monitoring Relays
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