The Siemens 5SL4403-7CC is a 4-pole miniature circuit breaker from the SENTRON 5SL4 family, rated at 3 A with a C-trip characteristic and a 10 kA breaking capacity at 400 V. The C-curve means it trips between 5 and 10 times rated current — standard for protecting inductive loads like motor circuits, contactor coils, and small transformers where inrush is moderate. The 10 kA interrupting rating at 400 V AC is the fault current it can safely clear without welding contacts or cascading damage upstream; that's the figure a panel designer checks against the prospective short-circuit current at the distribution board. This breaker snaps onto a standard 35 mm DIN rail in the enclosure. Four poles in a single module width (4 MW) means it occupies the same rail space as four single-pole breakers ganged together, but with a common trip mechanism — all poles open simultaneously on a fault, which matters for three-phase loads where single-phasing must be avoided.
Sourcing
This MCB is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — the active lifecycle means there is no last-time-buy window to chase, and no risk of a sudden EOL on a BOM line that uses this code.