The Siemens SENTRON 5SP3763-2XX02 is a 1-pole main miniature circuit breaker rated 63 A at 230/400 V AC with an E tripping characteristic. The solid and stranded conductor range of 2.5 to 50 mm² covers everything from a 2.5 mm² lighting circuit tail up to a 50 mm² main feeder, so it serves as both the service entrance breaker and a branch protector in the same enclosure. Mounting is on a 40 mm busbar system per DIN 43870 Part 2, the standard spacing for European meter-panel infrastructure. The 1.5 width units (approx. 27 mm per unit) mean it occupies 40.5 mm of DIN-rail space — wider than a standard 1-pole MCB, which is typical for a main breaker with higher cross-section terminals.
Because this is a current-production SENTRON 5SP3-series part, compliance documentation (CE, RoHS, REACH) is available from Siemens on request. The overvoltage category IV rating (6 kV surge resistance) confirms it is designed for the utility-side of the meter, not just downstream distribution.
Deployment context
This breaker is built for residential and infrastructure meter panels — the 5SP3 series is Siemens' dedicated main-switch MCB line for that segment. The infeed at the box terminal and the outgoing feeder via spring-loaded terminal are both designed for the wiring sequence of a DIN 43870 meter panel: incoming supply from the utility connects at the bottom, outgoing circuits leave from the top. The switch position indicator (OFF = green, ON = red) gives a quick visual status check without needing a multimeter. The mechanical service life of 20 000 switching cycles, combined with shock resistance of 30 g (11 ms half-sine) and vibration resistance of 2 g per IEC 60068-2-6, means it holds up in a panel that sees occasional mechanical shock from contactor operation or door slams — not a continuous-vibration environment like a machine tool.