ABB CM-ESN Voltage Monitoring Relay

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1. Product Overview

The ABB CM-ESN is a voltage monitoring relay designed for continuous monitoring of single-phase AC or DC voltages. It detects overvoltage and undervoltage conditions and provides an output signal for protection, alarm, or control purposes. As part of the ABB CM monitoring relay family, it offers high reliability and industrial-grade performance.

2. Technical Specifications

• Model: CM-ESN

• Product Type: Voltage Monitoring Relay

• Monitored Voltage:

  • Single-phase AC voltage

  • DC voltage (depending on version)

• Rated Voltage Range:

  • AC: approx. 24 V to 240 V AC (depending on version)

  • DC: approx. 24 V to 240 V DC (depending on version)

• Rated Frequency (AC): 50 / 60 Hz

• Monitoring Functions:

  • Undervoltage monitoring

  • Overvoltage monitoring

• Response Delay: Adjustable (typ. 0.1 s to 30 s)

• Output Contacts:

  • 1 or 2 changeover contacts (SPDT, depending on version)

• Contact Rating:

  • 250 V AC / 5 A (resistive load, typical)

• Supply: Powered by the monitored voltage

• Mounting: DIN rail mounting

• Housing Width: Approx. 22.5 mm

• Protection Degree: IP20

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

• Standards: IEC / EN industrial control standards

3. Key Advantages & Features

• Accurate Voltage Monitoring – Reliable detection of overvoltage and undervoltage.

• Wide Voltage Range – Suitable for various AC and DC applications.

• Adjustable Time Delay – Prevents nuisance tripping caused by short voltage dips.

• Compact Design – Saves space in control cabinets.

• Industrial-Grade Reliability – Designed for continuous industrial operation.

4. Typical Applications

The ABB CM-ESN is widely used in:

• Industrial automation systems

• Power supply monitoring for motors and equipment

• Voltage supervision in control and distribution panels

• PLC control and alarm circuits

• Pumps, fans, compressors, and machinery protection

• Building automation and infrastructure systems

5. Installation & Usage Notes

• Correct Selection – Ensure the monitored voltage type and range match the relay version.

• Proper Threshold Setting – Adjust over- and undervoltage limits according to system conditions.

• Time Delay Adjustment – Set an appropriate delay based on load characteristics.

• Correct Wiring – Follow terminal markings carefully for measurement and control circuits.

• Installation Environment – Install in a clean, dry, and well-ventilated control cabinet.