Best Phase Monitoring Relays of 2026

The SIEMENS Phase Monitoring Relay is a compact electronic component designed to keep your electrical systems safe and running smoothly. Its 22.5mm width makes it easy to install in tight spaces, while the screw terminals ensure secure and reliable connections. This relay monitors three-phase voltage and insulation, helping you detect line faults and phase sequence issues. With a delay time adjustable from 0 to 20 seconds, you can customize how it responds to electrical changes, offering you better control and protection. Plus, its wide line supply voltage range of 160 to 690 volts means it works well with various power setups.

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.

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 Walfront Voltage Protector is designed to ensure the safety of your equipment with its advanced features. It offers both automatic and manual reset options, allowing you to choose the best method based on your situation. You can easily adjust the overvoltage, undervoltage, and voltage imbalance settings to fit your specific needs, providing flexibility for various applications. Additionally, it continuously monitors your system in real-time to protect against issues like phase errors and disconnections, ensuring that your machinery operates smoothly and efficiently.

YWBL-WH Protection Relay is a single-phase monitoring relay that provides real-time monitoring of over-voltage and under-voltage faults. It has a standard modular structure and can be installed easily without requiring an additional auxiliary power supply. This relay is also equipped with an automatic identification system for AC/DC voltage, which eliminates the need for manual switching. The built-in LCD Chinese display shows voltage values, fault status, and setting parameters, making it easy to use. With its comprehensive protection functions, this relay ensures the safety of your electrical equipment. In case of any questions or concerns, their customer service is always available to assist you.

The YWBL-WH Voltage Relay is designed to help you protect and manage your equipment efficiently. It’s great for use with cranes, elevators, and refrigerated trucks, preventing damage caused by reverse connections or phase failures. The built-in LED indicator lets you easily see the relay’s status at a glance, so you know when it’s working. With high accuracy and eight adjustable voltage settings, you can be confident the relay measures voltage precisely, ensuring your equipment runs smoothly. Plus, it monitors its own operating voltage using true RMS measurement, giving you reliable and accurate performance every time.

The SIEMENS Voltage Monitoring Relay is designed to keep your electrical systems safe by monitoring three-phase voltage and insulation. Its compact size, measuring just over 3 cm in height and about 11 cm in length, allows for easy installation even in tight spaces. Weighing only 0.15 pounds, it is lightweight and convenient to handle. Made in the United States, this relay promises quality and reliability. With its precise voltage monitoring and delay settings, you can protect your equipment from voltage fluctuations effectively, making it a smart choice for maintaining stable power supply in your operations.

The SIEMENS Voltage Monitoring Relay is designed to help you keep an eye on three-phase voltage systems, ensuring your equipment runs smoothly and safely. Its compact size, measuring about 2.8 by 10.4 by 8.9 centimeters, makes it easy to fit into tight spaces. Weighing just a quarter of a pound, it’s lightweight and simple to handle during installation. Made in the United States, this relay offers reliable quality you can trust. With the SIEMENS Voltage Monitoring Relay, you get a user-friendly device that helps protect your electrical systems from voltage issues effectively.

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.

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.