ABB CM-SFS.225 Current Monitoring Relay

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• • • 1. Product Overview

      The ABB CM-SFS.225 is a current monitoring relay designed to monitor and protect motors, transformers, or other critical loads. It detects overcurrent, undercurrent, or current imbalance, and triggers relay outputs to control alarms or equipment operation, ensuring electrical system safety and reliability. CM-SFS.225 is compact and easy to install, suitable for industrial automation and low-voltage distribution systems.

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      2. Technical Specifications

      • Model: CM-SFS.225

      • Type: Current Monitoring Relay

      • Current Detection Range: 0.1–25 A AC

      • Supply Voltage: 24–240 V AC/DC

      • Output Contact: Relay, SPDT (Single Pole Double Throw)

      • Maximum Load Current: 5 A @ 250 V AC

      • Response Time: ≤ 200 ms

      • Operating Temperature: -20°C ~ +60°C

      • Storage Temperature: -40°C ~ +85°C

      • Mounting: DIN rail

      • Display & Adjustment: Front-panel knob for current threshold adjustment; LED status indicator

      • Protection Class: IP20

      • Dimensions (H×W×D): ~90 × 22.5 × 110 mm

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      3. Features & Advantages

      1. High-precision current monitoring — Monitors equipment current in real time to prevent damage from overcurrent or undercurrent.

      2. Flexible alarm and control — Relay output can directly control alarms, indicator lights, or protection relays.

      3. Easy installation — Standard DIN rail mounting for quick deployment.

      4. Wide compatibility — Suitable for motors, pumps, compressors, and transformers.

      5. High reliability — IP20 protection, suitable for standard industrial environments with strong interference immunity.

      6. Adjustable thresholds and status indication — Front-panel knob adjusts current threshold; LED shows real-time status for monitoring and debugging.

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      4. Typical Applications

      • Motor overcurrent/undercurrent monitoring

      • Transformer current monitoring

      • Industrial automation equipment protection

      • Low-voltage distribution system monitoring

      • Fan, pump, and compressor load protection

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      5. Precautions

      • Ensure supply voltage and monitored current range match CM-SFS.225 specifications.

      • Verify correct wiring of current transformers to avoid inaccurate measurements or false trips.

      • Avoid installation in high humidity, corrosive, or strong interference environments; use protective covers if necessary.

      • Regularly inspect the relay and terminal connections to ensure reliable operation.

      • Adjust threshold according to load rated current to prevent false alarms or delayed protection.

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