The Siemens 5SP3850-2XX32 is a SENTRON 5SP3 main miniature circuit breaker — a 3-pole, 50 A unit with an E tripping characteristic and a 25 kA breaking capacity rated per EN 60898. It's designed to mount on a 40-mm busbar system per DIN 43870 Part 2, inside a meter cabinet or residential/infrastructure panel.
The E curve (tripping characteristic class E) is a specific SENTRON offering — it sits between a standard C curve and a K curve in magnetic trip threshold, designed for transformer or motor-start loads that need a higher inrush headroom without going to a full motor-protective breaker. Terminals accept solid or stranded conductors from 2.5 mm² up to 50 mm² — that's a wide range, covering everything from a 2.5 mm² lighting circuit tail up to a 50 mm² main feeder. The box-terminal infeed and spring-loaded outgoing terminals make wiring straightforward in a meter-panel layout. That means it's rated for the main distribution point, not just sub-panel duty. Mechanical service life is 20 000 switching cycles typical. The switch-position indicator shows OFF = green, ON = red.
Integration notes
Mounts on a 40-mm busbar system per DIN 43870 Part 2, inside a meter cabinet. The design is a main miniature circuit breaker (SHU) — 3 x 1-pole units ganged, occupying 4.5 width units. The locking slide accepts a padlock, wire seal, cable ties, or Antilux seal for utility-meter security. The power supply cord position is stipulated for installation in the lower section of the meter panel.