ABB ST201M-B20 Industrial Safety Relay Module

ABB ST201M-B20 is a compact, single-pole miniature circuit breaker (MCB) engineered for fast, dependable overcurrent protection in low-voltage electrical installations. Installed on DIN rails in control panels, distribution boards, and machine cabinets, it helps isolate faults quickly while minimizing nuisance trips in normal operation. The device is rated for 20 A with a B-trip characteristic and provides a short-circuit breaking capacity of 10 kA at 277 V AC, offering robust performance in commercial and light industrial environments. ABB’s ST201M-B20 uses double-clamp terminals for secure wire termination and a compact form factor that integrates into existing panel layouts without extensive rewiring, reflecting ABB’s emphasis on reliability, ease of installation, and long service life in demanding applications. Typical applications include protecting branch circuits powering motors, conveyors, lighting, and control electronics in automation systems and building installations, where a dependable, clearly identifiable protection device helps meet safety requirements and minimize downtime.