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Product Overview

The ABB CH-MSS.33S (ISVR730712R2200) is a PTC thermistor-based motor protection relay designed to monitor motor winding temperature and provide reliable over-temperature protection. When the embedded PTC sensor detects abnormal heat rise in the motor, the relay activates an alarm or disconnects the motor control circuit to prevent overheating damage.

It is compact, robust, and ideal for continuous-duty industrial applications.

Technical Specifications

Electrical

• Model: CH-MSS.33S / ISVR730712R2200

• Supply voltage: 24–240 V AC/DC

• Input type: PTC thermistor sensor (DIN 44081/44082)

• Output contact:

  • 1 NO + 1 NC changeover contact

  • Rated: 6 A / 250 V AC

• Response time: < 200 ms

• Trip resistance: approx. 2.5–2.7 kΩ

• Reset mode: Automatic or manual (depending on model)

Construction

• Mounting: DIN rail (35 mm)

• LED indicators:

  • Power indicator

  • Fault/Trip indicator

Environmental

• Operating temperature: –20°C to +60°C

• Storage temperature: –40°C to +80°C

• Protection class: IP20

Advantages & Features

⭐ High-reliability motor temperature protection

Prevents overheating damage in motors, ideal for heavy-duty or continuous applications.

⭐ Compatible with standard PTC sensors

Works with DIN-compliant thermistors used in most industrial motors.

⭐ Wide supply voltage

Allows flexible installation with 24–240 V AC/DC.

⭐ Clear LED indication & relay output

Easy integration with PLCs, contactors, and protection systems.

⭐ Compact modular design

Quick installation and easy maintenance.

Application Areas

• Pumps and motor control panels

• Fans, compressors

• Conveyor systems

• Mining and metallurgical machinery

• Paper, textile, and industrial processing equipment

• HVAC systems

• Motors in harsh or high-temperature environments

Precautions

• Ensure the PTC sensor meets DIN 44081/44082 standards

• Correct wiring is essential to avoid false alarms

• Supply voltage must remain within rated limits

• Keep the device dry and free of conductive dust

• Does not replace overload relays—use together with contactors/thermal relays

• Maintain good ventilation

• Regularly inspect relay contacts

The structure and details of the product：

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