What this MCB is and where it fits
The Siemens SENTRON 5SY4402-6CC11 is a 4-pole miniature circuit breaker with a B tripping characteristic, designed to protect branch circuits against overload and short-circuit in industrial control panels and railway applications. Rated breaking capacity hits 10 kA per EN 60898 at 400 V AC, which covers the fault-current duty of most 400 V distribution boards in mechanical engineering and factory-floor environments. The B-curve trips between 3 and 5 times rated current, so it's a good fit for resistive or lightly inductive loads where you want fast clearing on a short-circuit but don't need the inrush headroom of a C or D curve.
Sourcing and lifecycle
For volume or blanket-order inquiries, submit an RFQ. The part is a standard SENTRON catalog item, so lead times are generally consistent with Siemens distribution channels.