Schneider RM35TM50MW Motor Temperature Control Relay

Overview

The Schneider Electric RM35TM50MW is a multifunctional motor monitoring relay from the Harmony Control Relays series. It provides comprehensive protection for three-phase motors by combining voltage supervision with advanced PTC temperature monitoring. This unit is engineered to detect phase failure, incorrect phase sequence, and motor overheating—ensuring optimal performance and extending motor life in industrial automation systems.

Key Features and Benefits

• Comprehensive Protection: Monitors both motor voltage and temperature, detecting overheating, phase imbalance, or incorrect rotation sequence.

• Flexible Voltage Range: Operates across a wide control voltage input of 24–240 V AC/DC, simplifying integration into diverse electrical systems.

• Reliable PTC Monitoring: Supports direct PTC thermistor input for precise motor winding temperature detection.

• Fast Response and Reset: Quick response time above 50 ms and automatic reset after 10 seconds ensure minimal downtime.

• Durable Industrial Design: Compact 35 mm width DIN rail module with IP54 front protection and robust self-extinguishing housing for harsh environments.

• Visual Diagnostics: LED indicators provide clear real-time status for power, temperature, and phase monitoring.

Technical Specifications

Electrical Ratings

• Control Voltage Range: 24–240 V AC/DC (50/60 Hz)

• Measurement Voltage Range: 208–480 V AC

• Voltage Limits: 176–528 V AC

• Power Consumption: 0–4 VA (AC), 0.5 W (DC)

• Output Contacts: 2 NO (normally open)

• Contact Rating: 5 A at 250 V AC/DC

• Switching Capacity: 1250 VA

• Minimum Switching Current: 10 mA at 5 V DC

Temperature Monitoring

• Sensor Type: PTC thermistor

• Trip Resistance: 3100 Ω ±10%

• Reset Resistance: 1650 Ω ±10%

• Short Circuit Resistance: ≤1500 Ω

• Reset Time: 10 s

• Response Time: >50 ms

Mechanical and Environmental Data

• Mounting: 35 mm DIN rail (IEC 60715)

• Protection: IP20 (body), IP54 (front panel)

• Housing Material: Self-extinguishing plastic

• Operating Temperature: -20°C to +60°C

• Storage Temperature: -40°C to +85°C

• Weight: 0.13 kg

• Standards: IEC 60255-6, IEC 60034-11-2, UL, CSA, GL, CE

Typical Applications

The RM35TM50MW is widely used in:

• Industrial motor control systems and conveyor drives

• HVAC and pumping stations for overload prevention

• Process automation and factory machinery

• Building management systems with phase monitoring needs

• Electrical panels where voltage sequencing and thermal safety are critical

Reliability and Service

Designed for long-term industrial use, the RM35TM50MW offers an electrical durability of 10,000 cycles and a mechanical endurance exceeding 30 million operations. It meets IEC standards for vibration and shock resistance, ensuring dependable performance even in demanding environments.

FAQ

Q1: Can the RM35TM50MW operate with both AC and DC control voltages?
Yes. It supports a wide control voltage range from 24 to 240 V AC/DC, offering flexibility for various installation types.

Q2: What kind of temperature sensors can be used?
It is compatible with standard PTC thermistor probes used in motor winding protection applications.

Q3: Does it provide phase sequence detection?
Yes. The relay automatically detects incorrect phase sequence and phase loss in three-phase systems.

Q4: What is the mounting type?
It mounts directly onto a 35 mm DIN rail, conforming to IEC 60715 standards.

Q5: Is it suitable for harsh industrial environments?
Absolutely. The RM35TM50MW is designed with high immunity to electrical interference, vibration resistance, and a wide operating temperature range.