The SENTRON 5SQ2270-0KA15 is a 2-pole miniature circuit breaker (MCB) with a C tripping characteristic, rated 15 A at 400 V AC and 3 kA breaking capacity per EN 60898. It switches both phase and neutral conductors — the neutral conductor switching function is built in, so you don't need a separate switched neutral bar.
Installation depth is 55 mm — shallower than the 70 mm typical of SENTRON's 5SU-series RCBOs, so it leaves more wiring space behind the panel door. IP20 rated, so it's intended for enclosed distribution boards only; no washdown exposure.