The SENTRON 5SQ2670-2YA63 is a 4-pole miniature circuit breaker (3P+N) rated 63 A at 400 V AC, 50 Hz, with a C tripping characteristic and a 3 kA breaking capacity per EN 60898. It switches the neutral conductor — that 4th pole is a switched neutral, not just a solid link, so you get full isolation on all live conductors when you pull the handle. The C-curve means it holds through motor inrush up to 5–10× rated current, then trips fast on hard shorts — standard for general-purpose distribution and mixed resistive-inductive loads in commercial or light industrial panels.
DIN-rail fit and panel space
Installation depth is 55 mm, which clears most standard enclosures without forcing a deeper gland plate.