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CM-MSS.12S

The ABB CM‑SRS.12S is a single‑phase current monitoring relay designed for industrial control applications where precise supervision of current is required. It is intended to monitor AC and DC current in a single‑phase supply and provides an output signal via a single changeover (SPDT) contact when the monitored current crosses set thresholds. The device is mounted on a standard 35 mm DIN rail and connects with screw terminals for reliable wiring. With adjustable settings and fast response, it is used in automation systems, motor protection circuits, alarms, and control logic where accurate current monitoring and switching output are necessary.

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Technical Parameters General Product Type: Current monitoring relay (single‑phase) Model: CM‑SRS.12S Mounting: DIN rail (IEC 60715) Terminal Type: Screw connection terminals Output Contact: 1 × changeover (SPDT) contact Contact Rating: Suitable for control and signal loads (e.g., up to ~250 V, typical industrial relay ratings) Monitoring & Function Monitored Current Type: AC and DC single‑phase Detection Function: Over‑ and under‑current detection based on set thresholds Output Contact Action: Changes state when monitored current exceeds or falls below the configured threshold Adjustability: Threshold and hysteresis adjustable for precise current supervision Indication: Relay output state indicates monitoring status Coil / Supply Control Supply Voltage: Typically supplied in variants such as 24 – 240 V AC/DC depending on version Voltage Type: Compatible with AC/DC supply types (model dependent) Electrical Ratings Output Contact Capacity: Suitable for switching control circuits (e.g., up to ~4 A at 250 V AC) Relay Contact Configuration: SPDT (Single Pole Double Throw) Mechanical & Physical Width: ~22.5 mm (1 module wide) Height: ~85.6 mm Depth: ~103.7 mm Housing: DIN‑rail industrial enclosure Mounting Rail: 35 mm DIN rail Performance & Response Response Time: Fast response to current changes (typically < 100 ms) Hysteresis: Adjustable to prevent chattering around threshold point Accuracy: Suitable for precise current monitoring in control systems Environmental Operating Ambient Temperature: Standard industrial ambient range Pollution Degree: Industrial environments Protection Rating: IP20 at terminal level (front/protection depends on panel installation) Applications Current monitoring in industrial control panels Motor supervision and protection circuits Alarm signalling for current thresholds Automation control logic (PLC/relay inputs) Detection of undercurrent / overcurrent conditions