Siemens 5SY5150-7KK11 SENTRON MCB, 50 A, 1P, C-Curve, 10 kA

The Siemens 5SY5150-7KK11 is a SENTRON miniature circuit breaker rated 50 A with a C tripping characteristic, meaning it is designed for moderate inrush loads typical of motor circuits, lighting banks, and small transformers — the magnetic trip operates between 5 and 10 times the rated current, so it holds through a motor start without nuisance tripping on a 50 A feeder. Breaking capacity is 10 kA per EN 60898 at 400 V AC, and 10 kA per EN 60898-2 at 220 V DC — this is the standard residential and light-commercial fault level; if your available fault current exceeds 10 kA, you need to step up to a higher-rated breaker or add a current-limiting upstream device. Rated for universal current (AC/DC) with a maximum DC voltage of 250 V — note the polarity requirement: AC supply can be connected either way, but DC polarity must be observed per the marking on the device.

Integration and mounting — DIN-rail fit and conductor range