ABB CM-PVS.41S Voltage Monitoring Relay

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1. Overview

The ABB CM-PVS.41S is a three-phase voltage monitoring relay designed to monitor and protect three-phase power systems. It detects overvoltage, undervoltage, incorrect phase sequence, phase loss, and phase unbalance. This device ensures stable operation of electrical equipment and improves safety and reliability in industrial environments.

2. Technical Specifications

• Model: CM-PVS.41S

• Monitoring Type: Three-phase voltage monitoring (without neutral)

• Rated Voltage Range: 208…480 V AC

• Frequency: 50 / 60 Hz

• Monitoring Functions:

  • Overvoltage

  • Undervoltage

  • Phase sequence

  • Phase loss

  • Phase unbalance

• Response Delay: Adjustable 0.1…30 s

• Reset Delay: Adjustable 0.1…30 s

• Output: 1 × SPDT relay output

• Contact Rating: 250 V AC / 6 A

• Operating Temperature: –25 ℃ to +60 ℃

• Electrical Life: 100,000 switching cycles (typical)

• Mounting: 35 mm DIN rail

• Protection Rating: IP20

• Certifications: CE, UL, CSA

3. Advantages & Features

1. Comprehensive Voltage Protection

   • Monitors overvoltage, undervoltage, phase sequence, phase loss, and unbalance.

2. High Precision and Reliability

   • Fast and accurate monitoring ensures rapid protection response.

3. Adjustable Time Delays

   • Prevents false trips caused by transient power fluctuations.

4. Wide Voltage Range

   • Suitable for a broad range of three-phase power systems (208–480V).

5. Easy Installation

   • Standard DIN-rail mounting simplifies wiring and replacement.

6. Industrial-grade Performance

   • Stable operation under harsh and continuously changing conditions.

4. Application Areas

• Industrial power distribution systems

• Motor and VFD protection

• Pumps, compressors, and fans

• Elevators and lifting equipment

• Industrial automation control systems

• UPS, HVAC, and power supply monitoring

• Any equipment requiring three-phase voltage protection

5. Precautions & Recommendations

1. Set the voltage range correctly

   • Adjust according to the actual grid voltage.

2. Mount inside a control panel

   • Avoid moisture and dust to extend service life.

3. Do not overload the relay contacts

   • Use an intermediate relay for heavy loads.

4. Check phase sequence before powering on

   • Incorrect sequence may cause false alarms.

5. Disconnect power before wiring

   • Ensures personnel safety and prevents equipment damage.

6. Regular inspection

   • Check indicator LEDs and relay output periodically.

The structure and details of the product：

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