The SENTRON 5SQ2170-0KA16 is a 1-pole miniature circuit breaker (MCB) with a C-curve tripping characteristic, rated 16 A at 240 V AC, 50 Hz, with a 3 kA breaking capacity per EN 60898. It accepts AC or DC supply voltage and occupies a single width unit on a DIN rail, with an IP20 finger-safe enclosure.
How it fits in a panel
Snap-on DIN-rail mount, 55 mm installation depth, one width unit (roughly 18 mm). IP20 rated for enclosed panel use — no washdown rating, so keep it behind a gland plate or cabinet door. Overvoltage category 3 and energy limiting class 3, which means it coordinates well downstream of a higher-rated upstream breaker for selective coordination in a distribution board.