The Schneider Electric RM22TU23 is a monitoring relay designed to provide protection for three-phase systems by monitoring voltage, phase sequence, and phase loss. This relay is typically used in motor control centres and other industrial applications to protect motors and other equipment from damage caused by electrical faults.

The RM22TU23 relay can be used to monitor systems with a voltage range of 208-480 VAC and a frequency range of 50/60 Hz. It can detect phase loss and phase reversal and can be set to operate in either phase failure mode or phase sequence mode.
The relay is easy to set up and use, with a user-friendly interface that allows for quick and easy configuration. The RM22TU23 has an LED display that provides visual indication of the status of the relay and the monitored system, and the relay can be easily reset by pressing a button on the front of the unit.

Voltage Monitoring: The RM22TU23 can monitor voltage levels and trigger an alarm or action if they go beyond a certain threshold. This helps protect equipment from damage caused by voltage surges or drops.
Phase Sequence Monitoring: The relay can detect phase sequence errors and prevent damage to equipment caused by incorrect rotation of three-phase motors.
Phase Loss Monitoring: The RM22TU23 can detect phase loss and prevent damage to equipment caused by unbalanced loads or other electrical faults.
Easy to Use: The RM22TU23 has a user-friendly interface that allows for quick and easy configuration, and the LED display provides clear visual indication of the status of the relay and the monitored system.
Memory Function: The relay has a built-in memory function that stores the last fault detected, allowing for quick and easy diagnosis of the problem.
Wide Operating Temperature Range: The RM22TU23 can operate in a wide temperature range making it suitable for use in harsh industrial environments.
Compact Design: The relay has a compact design that allows for easy installation in motor control centres and other industrial applications.