The 5SY4632-8CV is a Siemens miniature circuit breaker (MCB) with a D tripping characteristic, rated at 32 A per pole, in a 3P+N configuration — three protected poles plus a switched neutral. The headline number is the interrupting capacity: 15 kA at 400 V AC. That means this breaker can safely clear a fault current up to 15,000 A at 400 V without welding its contacts or rupturing the case, which is the figure that decides whether it holds up on a high-fault-capacity industrial panel fed by a transformer.
Deployment context
Snap-on DIN rail mount, standard 18 mm per pole width. The 3P+N unit occupies four modules (72 mm) on the rail. Rated for 400 V phase-to-phase, so it slots into a 3-phase 4-wire TN or TT distribution board feeding motor starters, small transformers, or lighting circuits where the D curve matches the load inrush.