The Siemens SENTRON 5SL6240-7RC is a 2-pole miniature circuit breaker rated 40 A with a C tripping characteristic, breaking 7.5 kA per EN 60898. That C-curve means it handles moderate inrush — think motor starters, pump contactors, or a bank of lighting ballasts — without nuisance tripping on the magnetizing spike, but it still clears a hard fault fast enough to protect the downstream wiring. The 7.5 kA interrupting rating at 400/415 V AC tells you it can handle a bolted fault in a residential or light commercial distribution board without welding its contacts shut.
Sizing and fit
At 36 mm wide (2 modular-width units) and 76 mm deep, this breaker clips onto a standard 35 mm DIN rail in any mounting position. The 70 mm installation depth leaves room behind a flush-mount panel cover. IP20 with connected conductors means it belongs inside an enclosure — not out in the washdown zone. Rated for 50/60 Hz supply, single-phase up to 250 V AC or multi-phase up to 440 V AC. The 72 V DC maximum rating covers control-circuit applications off a rectified supply.