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ABB CM-TCS.21S Temperature Monitoring Relay

1. Product Description

The ABB CM-TCS.21S is an industrial-grade temperature monitoring relay designed to monitor the temperature of equipment, pipelines, or containers using external sensors such as PT100. When the measured temperature exceeds or drops below a set threshold, the relay triggers an alarm or control output, providing device protection and process control. The compact design and DIN-rail mounting make it suitable for industrial automation, energy management, and temperature control systems.

2. Technical Specifications

• Model: CM-TCS.21S

• Supply Voltage: 24 V DC / AC ±10%

• Sensor Type: PT100 (2-wire or 3-wire)

• Monitoring Mode: Over-Temperature, Under-Temperature, Window

• Measurement Range: –50°C to +50°C

• Relay Output: 1 × 2 CO (SPDT) or 2 × 1 CO (SPDT)

• Contact Rating: 250 V AC / 4 A

• Mounting: DIN rail (35 mm)

• Dimensions: 22.5 mm × 85.6 mm × 103.7 mm

• Operating Temperature: –40°C to +60°C

• Storage Temperature: –40°C to +70°C

• Protection Rating: IP20

• Typical Lifespan: ≥10 years

3. Features & Advantages

• Multiple monitoring modes: over-temperature, under-temperature, window for versatile applications

• High-precision measurement compatible with standard PT100 sensors

• Relay output (SPDT) for alarms or direct device control

• Compact DIN-rail design saves control cabinet space

• LED status indicators for clear on-site monitoring

• Industrial-grade reliability for harsh environments

• Sensor fault detection for wire break or short-circuit

4. Application Areas

• Industrial automation temperature monitoring

• Overheat protection for motors, transformers, switchgear

• Cooling/heating system control in manufacturing equipment

• HVAC temperature control

• Temperature protection for pumps, fans, compressors

• Cold storage and warehouse temperature monitoring

• Any industrial equipment requiring temperature alarms or control

5. Precautions

1. Always disconnect power before installation for safety.

2. Use correct 2-wire or 3-wire PT100 connections to ensure measurement accuracy.

3. Avoid installing in high humidity, dusty, or corrosive environments.

4. Consider hysteresis and switching frequency when setting thresholds to prevent relay chatter.

5. Regularly inspect sensor connections and relay contacts to ensure reliable monitoring.

6. Follow ABB manuals and device operating instructions during use.

The structure and details of the product：

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