The Siemens 5SP3716-2KK01 is a 1-pole SENTRON miniature circuit breaker rated 16 A at 230 V AC, 50 Hz, with an E tripping characteristic and a 25 kA breaking capacity per EN 60898. It mounts on a 40-mm busbar system per DIN 43870 Part 2, which is the standard meter-panel busbar pitch in European residential and infrastructure installations. The 1.5 width units (roughly 27 mm) keep the footprint tight in a multi-pole distribution board. Infeed is via box terminal at the top; outgoing is through a spring-loaded terminal, so no screw torque is needed on the load side — just strip and push.
Where it goes and what it protects
This breaker is designed for residential buildings and infrastructure — think apartment distribution boards, light commercial sub-panels, or meter cabinets. The E characteristic is less common than B or C in general-purpose circuits, but it's specified where the load has a known high inrush that would trip a C curve on energisation: small transformers, power supplies, or capacitor banks. The enclosure depth is 76.3 mm, and the overall depth including terminals is 89.5 mm — that's the dimension to check against a shallow meter-panel lid.