Best Phase Monitoring Relays of 2025

This monitoring relay is a three-phase voltage relay with insulation monitoring, 2 CO contacts, and off delay 0-20s delay time. It has a 160-690 line supply voltage and a compact design with screw terminals. This electronic component is made in the United States and has a small package size and weight.

This electronic component is a phase monitoring relay with insulation monitoring and delay time features. It has a compact size of 22.5mm width and screw terminals for easy installation. It operates with a line supply voltage of 160-690 and has 1 CO contact. Made in the USA, it weighs only 0.25 pounds and comes in a package with dimensions of 10.414 x 9.144 x 3.048 centimeters.

The YWBL-WH Voltage Relay is an essential tool for monitoring electrical systems. It accurately measures operating voltage with a true RMS measurement, ensuring you can trust the readings. With eight adjustable voltage settings and an accuracy of less than 1%, you can customize it to fit your specific needs. This relay not only helps prevent equipment malfunctions, such as reverse operation and phase failures, but also features an LED indicator for easy monitoring of its status. Additionally, its compact size allows for simple installation on a standard 35mm DIN rail, making it convenient for various applications.

The YWBL-WH Phase Monitoring Relay is designed to ensure the reliable operation of your equipment. With its robust anti-interference capabilities, it helps maintain continuous and efficient motor performance. This relay detects phase sequence and phase loss effectively, alerting you when any issues arise. It is ideal for various applications, from motors to central air conditioning units, making it a versatile tool for everyday use. Compact and easy to install, it fits seamlessly into any space, allowing you to monitor your systems without hassle.

The EVTSCAN Phase Monitoring Relay is designed to keep your motors running smoothly by monitoring phase sequence and loss. This ensures that your equipment operates correctly, preventing potential damage from incorrect phase setups. With its robust anti-interference performance, you can rely on it even in electrically noisy environments. This relay also helps to extend the lifespan of your motors by detecting issues early, allowing for timely interventions. Its compact size makes installation a breeze in tight spaces, giving you flexibility in various systems.

The GEYA Voltage Relay offers essential voltage protection with its adjustable features. You can easily choose the operation mode using a convenient knob, allowing for customized performance tailored to your needs. It provides accurate voltage measurements, ensuring that you are always aware of your system's status. Additionally, the LED indicator clearly shows the relay's working status, giving you peace of mind. With its compact design, measuring only 18mm in width, it fits effortlessly into tight spaces, making it a practical choice for any setup.

The YWBL-WH SVR1000 Single Phase Protection Relay is a guide rail type installation phase monitoring relay with a standard modular structure. It has automatic identification of universal AC/DC voltage, eliminating the need to switch. The built-in LCD Chinese display shows voltage value, fault status, and setting parameters. It provides real-time monitoring of single phase over-voltage and under-voltage faults without requiring additional auxiliary power supply.

The Siemens Monitoring Relay is a versatile electronic component that offers reliable three-phase voltage monitoring and insulation monitoring. With a compact design and screw terminal connection, it is easy to install in various applications. The relay features two CO contacts and a delay time function, allowing for precise control and protection of electrical systems. The wide range of line supply voltage (160-690 volts) makes it suitable for different power supply setups. Whether you need to monitor voltage levels or ensure insulation safety, the Siemens Monitoring Relay is a dependable choice that brings convenience and peace of mind to your electrical setup.

The Nannday Monitor Relay is a 3-phase circuit protection voltage monitoring relay phase failure sequence protector for motors and pumps. It has three indicators to show normal operation, phase loss (voltage three-phase unbalance), and reverse phase. This relay provides phase loss protection, which means that it can detect any phase failure that occurs during the running or non-operating state with a 2-second delay. Additionally, it also offers reverse phase protection, which prevents L1, L2, L3 three-phase AC phase sequence from being connected incorrectly with a 2-second delay. The voltage imbalance protection feature is also available, which helps protect the line from unsafe operation due to three-phase voltage imbalance. This relay is ideal for use in various devices, such as air compressors, electric motors, distribution boxes, water pumps, oil pumps, and central air conditioning units.

The Walfront Voltage Relay is designed for easy installation and reliable performance in managing voltage levels for electric motors. With three reset modes—manual, automatic, and automatic with a power-on delay—you can choose the best option for your needs. It automatically identifies whether the voltage is AC or DC, eliminating the hassle of manual switching. Additionally, the built-in LCD display shows real-time voltage values and fault statuses, making it convenient for you to monitor your system. The relay also records faults, ensuring you have a comprehensive view of any issues that arise.