The Siemens SENTRON 5SL6340-7RC is a 40 A, 3-pole miniature circuit breaker with a C tripping characteristic and a 7.5 kA breaking capacity rated per EN 60898 at 415 V AC. It's designed for residential and infrastructure branch-circuit protection where moderate inrush currents — typical of lighting, small motor, and general-purpose loads — need a delayed magnetic trip to avoid nuisance tripping on startup.
The 5SL6340-7RC snaps onto a DIN rail and occupies 3 modular width units (54 mm total width), with a depth of 76 mm and an installation depth of 70 mm behind the panel face.
Rated for multi-phase operation up to 440 V AC and single-phase up to 250 V AC, with a frequency range of 50/60 Hz. The C curve trips magnetically between 5 and 10 times rated current, so a 40 A breaker clears faults roughly between 200 A and 400 A instantaneously — suitable for circuits where the inrush from motors or transformers would otherwise trip a B curve. Power loss is 3.3 W per pole in hot operating state at rated current, which adds about 10 W total heat dissipation inside the enclosure — factor that into your thermal budget for a multi-breaker panel.
The breaker accepts supplementary devices (shunt trips, auxiliary contacts, alarm switches) for remote signaling or emergency-off integration. The housing is sealable — a lockable cover or lead-seal wire can be fitted to prevent unauthorized switching, which is a common requirement in metering or safety-critical circuits.