ABB S201MUC-K20 Safety Relay Module Industrial Automation

ABB S201MUC-K20 is a 1P+N miniature circuit breaker in ABB’s System pro M compact family, engineered to protect single‑phase circuits inside industrial automation panels by interrupting overcurrents and short‑circuit faults. The device is rated for 20 A (In) and configured as a 1‑pole‑with‑neutral unit, identifiable by the S201MUC‑K20 designation. Designed for DIN rail mounting, it integrates into compact protection schemes within ABB’s modular panel systems and is compatible with System pro M compact installations. The Type K current‑limiting characteristic provides a controlled response to moderate overloads while ensuring rapid disconnection on higher fault currents, making it well suited for protecting control circuits, PLC power feeds, motor starters, and lighting circuits in automation environments. By using the S201MUC‑K20, engineers can achieve clear, codified protection within ABB’s S201M/MUC lineup, with the model number explicitly encoding In rating, pole configuration, and curve type for precise ordering and replacement. In typical applications, it serves as a dedicated single‑phase protection device in machine panels and automated control cabinets, helping to ensure reliable electrical protection in industrial environments.