CM-SRS.21S 1SVR730841R1400_ABB_PRODUCT_吉林易择科技技术发展有限公司

Technical Parameters Parameter / Feature Specification Supply (Control) Voltage 220–240 V AC Measured Current Ranges (RMS) 3–30 mA, 10–100 mA, 0.1–1 A Functionality Over‑current monitoring and under‑current monitoring (configurable) Output Contacts 2 × changeover contacts (SPDT / 2 c/o) Contact Rating 250 V AC / 4 A (resistive load) Tripping Delay / Time Setting Instantaneous (0 s) or adjustable delay 0.1–30 s (ON) Hysteresis (Threshold Dead‑band) Adjustable: 3%–30% of threshold level Connection / Terminals Screw‑type terminals (double‑chamber/cage connection) Mounting DIN‑rail (TH35 per IEC 60715) Dimensions (W × H × D) 22.5 mm × 85.6 mm × 103.7 mm Operating Ambient Temperature –20 °C … +60 °C Storage Temperature –40 °C … +85 °C Insulation / Overvoltage / Protection Rated insulation voltage between measuring and output circuits; output circuit max 300 V; housing IP50 / terminals IP20; pollution degree 3, overvoltage category III Application Single‑phase current monitoring (AC or DC), over‑/under‑current protection in control panels, machinery or industrial installations

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DESCRIBE

The CM‑SRS.21S is a single‑phase current‑monitoring relay from ABB’s CM‑SRS series. It monitors AC and/or DC current and triggers an output when the measured current goes above or below a set threshold — providing either over‑current or under‑current protection. The device supports multiple measuring ranges for flexibility, and allows adjustment of hysteresis and tripping delay. Output is provided via dual changeover (SPDT) contacts, and the relay is designed for DIN‑rail mounting with standard screw‑type terminals.

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