The Schneider Electric RM17TG20 is a modular three-phase supply control relay from the Harmony Control Relays range, designed to monitor phase sequence and detect phase failure in three-phase electrical networks. It operates across a wide self-powered voltage range of 183 to 484 V AC and provides protection via two C/O output contacts rated at 5 A.
Technical specifications:
- Commercial reference: RM17TG20
- Manufacturer: Schneider Electric
- EAN: 3389119405072
- Series / range: Harmony Control Relays
- Relay name: RM17TG
- Application: Three-phase supply monitoring
- Monitored parameters: Phase sequence, phase failure detection (2 or more phases)
- Supply voltage range: 183...484 V AC (self-powered)
- Control circuit voltage: 208...440 V
- Output contacts: 2 C/O, rated 5 A
- Maximum switching voltage: 250 V AC / 250 V DC
- Switching capacity: 1250 VA
- Power consumption: 0...22 VA at 400 V AC 50 Hz
- Switch-on delay: 650 ms
- Response time on fault: <= 130 ms
- Supply frequency: 50/60 Hz +/- 10%
- Connection: Screw terminals, 1 x 0.5...4 mm² single-wire or 1 x 0.2...2.5 mm² flexible
- Mounting: 35 mm symmetrical DIN rail per IEC 60715
- IP rating: IP20 (terminals) / IP30 (housing) per IEC 60529
- Operating temperature: -20...50°C
- Storage temperature: -40...70°C
- Width: 17.5 mm
- Weight: 0.13 kg
- Electrical endurance: 10,000 cycles
- Certifications: UL, CSA, GOST, C-Tick, GL, CE
Features and benefits:
- Self-powered operation draws directly from the monitored three-phase circuit - no separate auxiliary supply required
- Detects both phase sequence errors and phase loss (2 or more phases) for comprehensive supply protection
- Fast fault response time of <= 130 ms limits downstream equipment exposure
- Yellow LED indicator provides clear local relay-on status signaling
- Compact 17.5 mm wide DIN rail housing suitable for space-constrained control panels
- High mechanical endurance of 30,000,000 cycles for long service life
Applications:
- Protection of three-phase motors against phase loss and incorrect phase sequence
- Industrial motor control centers and control panels
- HVAC and building automation systems with three-phase supply
- Process automation panels requiring continuous three-phase supply monitoring
- Pump and compressor control stations
Compliant with IEC 60255-1, IEC 60947-5-1, and EMC standards IEC 61000-6-2, IEC 61000-6-3, and IEC 61000-6-4. Part of the Schneider Electric Harmony Control Relays range.
Also known as: Schneider RM17TG20, Schneider Electric RM17TG20, phase sequence monitoring relay, three-phase control relay.