ABB CM-MPS.21S 1SVR730885R3300 Three-phase monitoring relay

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Product Overview / Function

The CM-MPS.21S is a three-phase monitoring relay from ABB, designed to monitor three-phase electrical systems in real time. It detects phase sequence, phase loss, phase voltage imbalance, and over/under voltage conditions. When an abnormality occurs, the relay triggers an alarm or disconnects the load, protecting motors, transformers, and other critical equipment from electrical faults. It is suitable for industrial control panels, power distribution systems, and automated production lines.

Key Technical Specifications

• Product type: Three-phase Monitoring Relay

• Model: CM-MPS.21S

• Rated voltage: Three-phase AC 380–480 V

• Monitoring functions: Phase sequence, phase loss, over/under voltage, phase imbalance

• Output contacts: 1 NO + 1 NC

• Response time: ≤ 200 ms

• Mounting method: DIN rail

• Environmental suitability: Industrial-grade, resistant to high temperature, humidity, and vibration

• Rated insulation voltage: 690 V AC

• Power consumption: ≤ 3 VA

Advantages & Features

1. Comprehensive three-phase monitoring: Detects phase sequence, phase loss, over/under voltage, and phase imbalance for equipment protection

2. Fast response: Immediate action during abnormal conditions to reduce risk of equipment damage

3. Compact installation: DIN rail mounting saves control cabinet space

4. High reliability: Industrial-grade design for harsh environments

5. Easy integration: Suitable for distribution systems, motor protection, and automation control

Typical Application Areas

• Three-phase motor protection and monitoring

• Distribution systems and industrial control panels

• Automated production lines and factory electrical monitoring

• Transformer and power equipment protection

• Power, chemical, petrochemical, and industrial manufacturing industries

Precautions

• Power off before installation or maintenance

• Ensure input voltage matches system voltage

• Avoid exposure to high humidity or corrosive environments

• Regularly check relay operation and contact connections

• Do not exceed rated contact load current

The structure and details of the product：

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