The SENTRON 5SQ2670-0KA50 is a 4-pole miniature circuit breaker (3P+N) from the 5SQ design family, rated 50 A at 400 V AC, 50 Hz, with a C tripping characteristic and a 3 kA breaking capacity per EN 60898 and IEC 60947-2. It switches the neutral conductor (3P+N), so it fits sub-distribution boards where a switched neutral is required for isolation or selectivity.
Rated for overvoltage category 3 and energy limiting class 3, it provides adequate surge withstand and fault-energy limitation for fixed-installation sub-circuits.