The Siemens SENTRON 5SP3863-2XX32 is a 3-pole main miniature circuit breaker (MCB) rated 63 A at 400 V AC, 50 Hz, with an E tripping characteristic and a 25 kA breaking capacity per EN 60898. The E curve means it is designed for selective coordination with downstream MCBs — it tolerates short-duration overloads and high inrush currents without tripping, making it suitable for main distribution in residential and infrastructure panels where selectivity with sub-circuits is required.
This breaker mounts on a 40-mm busbar system per DIN 43870 Part 2, typical for meter cabinet installations. It occupies 4.5 width units (about 81 mm) on the busbar. The incoming feed connects via box terminal at the bottom; outgoing conductors use spring-loaded terminals accepting 2.5 to 50 mm² solid or stranded wire. The locking slide accepts a padlock, wire seal, cable ties, or Antilux seal for tamper-proof isolation — useful for utility metering or rental applications where unauthorized reset must be prevented.