ABB ST202M-B20 Safety Relay

ABB ST202M-B20 is a 2-pole miniature circuit breaker (MCB) rated for 20 A with a B-characteristic trip curve, designed for use in ABB System pro M compact DIN-rail installations to protect electrical circuits from overcurrent. It delivers a short-circuit breaking capacity up to 10 kA and occupies a 2P footprint for protection of two conductors in a single device. The B-curve trips between 3 and 5 times the rated current, providing fast protection for typical general‑purpose loads while remaining stable under normal operating conditions. As part of ABB’s System pro M compact family, the ST202M-B20 is compatible with standard DIN-rail mounting and is meant for installation in control panels, machine enclosures, and distributed power architectures where reliable overcurrent protection is required.