RM35TM50MW Motor Protection | Schneider Relay for Harmony Series

Schneider RM35TM50MW Motor Temperature & Voltage Monitoring Relay

The Schneider Electric RM35TM50MW is a compact monitoring relay designed to protect three-phase motors from electrical faults and thermal overload. It supervises phase sequence, detects phase failure, and evaluates motor temperature through PTC probes with consistent accuracy. Moreover, its wide 24–240 V AC/DC supply range makes integration straightforward in modern control panels. The relay suits demanding industrial environments where consistent performance and simple installation are equally important.

The device supports voltage supervision from 208 to 480 V AC while managing both thermal and electrical risks in a single DIN-rail module. Therefore, maintenance teams can reduce downtime and extend motor lifetime with minimal configuration effort. In addition, the relay contributes to safer operation across HVAC systems, pumps, conveyors, and general-purpose machinery.

Technical Specifications

Electrical Ratings
• Control Supply Voltage: 24–240 V AC/DC, 50/60 Hz
• Operating Range: 20.4–264 V AC/DC
• Measurement Voltage (3-phase): 208–480 V AC
• Voltage Limits: 176–528 V AC
• Power Consumption: 0–4 VA (AC), 0.5 W (DC)
• Frequency Tolerance: ±10%

Motor Monitoring
• Phase Monitoring: Incorrect phase sequence and phase loss detection
• Temperature Monitoring: PTC probe input (motor winding)
• Trip Threshold: 3100 Ω ±10%
• Reset Time: 10 seconds
• Response Time: >50 ms

Output Characteristics
• Relay Contacts: 2 NO
• Nominal Output Current: 5 A AC/DC
• Switching Capacity: AC up to 1250 VA, DC up to 250 V
• Minimum Switching: 10 mA at 5 V DC

Mechanical & Environmental
• Mounting: DIN-rail
• Protection: IP20 (body), IP40 (front)
• Operating Temperature: −20 °C to +60 °C
• Storage Temperature: −40 °C to +85 °C
• Humidity: 5–95% non-condensing
• Width: 35 mm
• Net Weight: 0.13 kg

Compliance & Sustainability
• Standards: IEC 60947-5-1
• Certifications: CE, UL, CSA
• Carbon Footprint: 29 g CO₂ equivalent
• Packaging: ≥70% recycled cardboard
• Eligible for Schneider take-back program

FAQ

Q: Does the relay require an external power supply?
A: No. Its control supply accepts 24–240 V AC/DC, which simplifies panel design and reduces wiring.

Q: Can it detect both thermal and electrical motor faults simultaneously?
A: Yes. It monitors PTC probe resistance and three-phase voltage conditions at the same time.

Q: Is the relay suitable for inverter-driven motors?
A: It is typically installed on the mains side rather than the VFD output due to measurement requirements.

Q: How fast does the relay respond to abnormal conditions?
A: It reacts to electrical faults in more than 50 ms and resets 10 seconds after conditions normalize.

Q: Can it switch low-energy PLC inputs?
A: Yes. Its minimum switching current of 10 mA at 5 V DC supports most automation interfaces.