Schneider RM22TA33 Modular 3 phase supply control relay

The Schneider Electric RM22TA33 is a three-phase supply control relay in the Harmony Control Relays range, designed to monitor phase sequence, phase loss, and voltage asymmetry. It operates on 380...480 V AC, delivers 2 C/O output contacts rated at 2000 VA switching power, and features an adjustable fault time delay of 0.1...30 s for configurable protection of three-phase electrical equipment.

Technical specifications:

• Commercial reference: RM22TA33
• Manufacturer: Schneider Electric
• EAN:
• Series / range: Harmony Control Relays
• Product type: 3-phase supply control relay
• Monitored parameters: Phase sequence, phase loss, voltage asymmetry
• Supply voltage: 380...480 V AC (operating limits: 304...576 V AC)
• Output contacts: 2 C/O, max 8 A AC / 250 V AC
• Switching power: 2000 VA
• Adjustable time delay: 0.1...30 s (+/- 10% of full scale)
• Asymmetry threshold setting: 5...15% of Un
• Response time: 300 ms
• Mounting: 35 mm DIN rail per IEC 60715, any orientation
• Connection: Screw terminals, up to 2 x 2.5 mm² solid (AWG 14) / 2 x 1.5 mm² flexible (AWG 16)
• IP rating: IP40 (housing) / IP50 (front panel) per IEC 60529
• Operating temperature: -20...60°C at 50 Hz / -20...50°C at 60 Hz
• Width: 22.5 mm / Weight: 0.09 kg
• Certifications: CE, UL, CSA, CCC, EAC, RCM, GL

Features and benefits:

• Monitors phase sequence, phase loss, and voltage asymmetry simultaneously in a single compact unit
• Adjustable fault delay (0.1...30 s) reduces nuisance tripping during brief supply disturbances
• Compact 22.5 mm DIN rail design minimises space consumption in control panels
• Integrated test button allows on-site commissioning and functional verification without live fault simulation
• Cadmium-free contacts and self-extinguishing plastic housing support environmental compliance

Applications:

• Protection of three-phase motors and pumps against phase loss and voltage asymmetry
• Three-phase supply quality monitoring in industrial automation panels and switchboards
• Protection of compressors, fans, and HVAC systems sensitive to phase imbalance

Compliant with IEC 60255-1, IEC 60947-5-1, and IEC 60947-4-1. Part of the Schneider Electric Harmony Control Relays range.

Also known as: Schneider RM22TA33, Schneider Electric RM22TA33, phase asymmetry relay, three-phase monitoring relay.