The SENTRON 5SQ2270-2YA50 is a 2-pole miniature circuit breaker (MCB) rated 50 A at 400 V AC with a C tripping characteristic. The 3 kA breaking capacity per EN 60898 is the maximum fault current it can safely interrupt at 400 V; for most residential, commercial, and light industrial distribution boards this is sufficient, but verify against your panel's prospective short-circuit current (PSCC). The 55 mm installation depth fits standard distribution board cutouts; the 2 width units (36 mm per DIN 43880) occupy two module spaces on the DIN rail.
Deployment context
Snap-on DIN rail mounting, IP20 finger-safe terminals — intended for enclosed distribution boards or control panels where the breaker is not exposed to washdown or dust. The AC/DC voltage type means the same unit can be used on DC circuits up to 48 V or 60 V (derate current per manufacturer curve), though the primary rating is 400 V AC at 50 Hz.