ABB CM-PVS.41 S Three-phase monitoring relay

1. Product Overview

The ABB CM-PVS.41 S is a three-phase voltage monitoring relay designed to supervise AC power systems. It monitors phase loss, phase sequence, overvoltage, undervoltage, and phase unbalance conditions. Widely used in electrical protection, automation systems, and industrial equipment, it provides fast and reliable fault detection to safeguard critical loads.

2. Technical Specifications

General

• Model: CM-PVS.41 S

• Type: Three-phase voltage monitoring relay

• Installation: DIN rail (35 mm)

Monitoring Functions

• Phase loss detection

• Phase sequence monitoring

• Overvoltage and undervoltage detection

• Phase imbalance detection

• Adjustable trip thresholds

• Adjustable delay times (start and recovery delays)

Electrical

• Rated Voltage Range: 3 × 208–480VAC

• Frequency: 50/60 Hz

• Power Supply: Supplied directly from monitored voltage

• Output Contact: 1 × SPDT (changeover contact)

• Rated Switching Current: 6A (AC1)

• Electrical Life: >100,000 operations

Environmental

• Operating Temperature: –25°C to +60°C

• Storage Temperature: –40°C to +85°C

• Protection Class: IP20

• Industrial-grade immunity and insulation

3. Features & Advantages

1. High-precision voltage supervision.

2. Multiple protections: phase loss, phase sequence, OV/UV, imbalance.

3. Adjustable thresholds and delays for flexible configuration.

4. High reliability for industrial environments.

5. Compact design with easy DIN rail installation.

6. Strong vibration resistance for harsh conditions.

4. Application Areas

• Industrial automation systems

• Motor and pump protection

• Three-phase power monitoring

• Power distribution and control cabinets

• HVAC and compressor units

• Power plants and substations

• Elevators, conveyors, and critical load protection

• Industrial and mining electrical systems

5. Precautions & Maintenance

1. Disconnect power before installation or wiring.

2. Ensure correct three-phase wiring to avoid false alarms.

3. Set thresholds and delay times according to system requirements.

4. Avoid corrosive or high-humidity environments.

5. Regularly check for secure terminal connections.

6. Protect the device from heavy vibration or impact.

7. Install the relay in a ventilated control panel.

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