Schneider Electric RM22TR33 Harmony 8A 2CO 380-480V AC Over/Undervoltage Phase Loss 3-Phase Control Relay

The Schneider Electric RM22TR33 is a Harmony RM22-TR multifunction 3-phase control relay that monitors a 380-480 V AC supply for over/undervoltage, phase loss and phase sequence faults. It switches two 8 A changeover contacts with an adjustable 0.1-30 second fault delay, in a 22.5 mm wide DIN rail housing with a front diagnostic button.

Technical Specifications

Certifications & Standards

• GL
• CSA
• RCM
• CE
• EAC
• CCC
• UL
• IEC 60255-1

Selection Notes

RM22TR33's 380-480 V measurement range and dual 2 C/O 8 A contacts make it a hard-wired replacement for a PLC-based three-phase supply monitor in retrofit panels, with the front diagnostic button and test function cutting fault-finding time versus the simpler single-contact RM10T family. Where the monitored circuit is a single-phase 1-100 V or 15-500 V signal rather than a 3-phase line voltage, the RM22UA32MR or RM22UA33MR single-phase voltage relays in the same 22.5 mm housing are the correct siblings instead. Reliability data rates RM22TR33 at B10d = 350,000 operations and an MTTFd of 388.1 years, figures worth pulling into a mission-time calculation if the relay feeds a safety-related shutdown circuit downstream rather than just an alarm indicator. The front test button triggers each monitored condition in turn for commissioning checks without having to force an actual supply fault, cutting first-start troubleshooting time on new panel builds.