The Siemens 5SP3750-2KK02 is a 1-pole main miniature circuit breaker (SHU) from the SENTRON 5SP3 family, rated 50 A at 230 V AC with an E tripping characteristic and a 25 kA breaking capacity per EN 60898. It is designed for busbar mounting on a 40 mm system per DIN 43870 Part 2, typically installed in the lower section of a meter panel for residential or infrastructure service-entrance duty.
The E tripping curve is a specialty characteristic between B and C, designed for selective coordination with upstream fuses or breakers in utility metering applications; it holds through moderate overloads but trips fast on short circuits. Overvoltage category IV and a 6 kV surge voltage rating confirm it is rated for the mains entry point, not just downstream distribution.
Mounts on a 40 mm busbar system per DIN 43870 Part 2, not a standard DIN rail — verify your meter panel has the correct busbar pitch. The breaker occupies 1.5 width units and measures 151.3 mm high by 89.5 mm deep; enclosure depth is 76.3 mm. Infeed is via box terminal; outgoing feeder uses a spring-loaded terminal. Sealable with a locking slide accepting padlocks, wire seals, cable ties, or Antilux.
Environmental and mechanical specs
Rated IP40 with connected conductors. Ambient temperature range -40 to +70 °C. Shock resistance 30 g, 3 impacts at 11 ms; vibration resistance 2 g per IEC 60068-2-6. Mechanical service life 20 000 switching cycles. Switch position indicator shows OFF = green, ON = red.