The Siemens SENTRON 5SL4440-7CC is a 4-pole miniature circuit breaker rated 40 A with a C tripping characteristic, designed for 400 V AC systems and a 10 kA breaking capacity per EN 60898. It occupies 4 modular width units (72 mm) on a DIN rail, making it a direct fit for residential and infrastructure distribution boards where a 4-pole C-curve MCB at this rating is specified.
The C-curve trips between 5 and 10 times rated current (200–400 A magnetic release), which suits moderate inrush loads like lighting banks, small transformers, and motor starters in residential or light commercial panels. The 10 kA breaking capacity at 400 V AC (per EN 60898) means it safely clears a fault up to that prospective short-circuit current without welding contacts or cascading failure upstream — adequate for most final subcircuits in buildings where the fault level at the board is below 10 kA.
Depth is 76 mm, installation depth 70 mm; the 72 mm width (4 MW units) means it occupies four 18 mm slots in a distribution board. The terminals accept the usual copper conductors for a 40 A circuit; sealable covers are available for tamper-proofing.