The Siemens SENTRON 5SP3835-2XX32 is a main miniature circuit breaker (MCB) — specifically a 3-pole unit rated 35 A with an E tripping characteristic, designed as the primary overcurrent protection in residential and infrastructure meter panels. It mounts on a 40-mm busbar system per DIN 43870 Part 2, which is the standard rail inside European meter cabinets.
The E-curve (tripping characteristic class E) is the key differentiator here — it's a specialty curve between B and C, designed for main breakers where you need a higher magnetic trip threshold to avoid nuisance trips from inrush, but not as high as a K or Z curve. The solid and stranded wire range of 2.5 to 50 mm² covers everything from a 2.5 mm² meter tail up to a 50 mm² main feeder, so you're not fighting undersized terminals on a 35 A main. The 3-pole unit is 4.5 width units wide — that's about 81 mm on the busbar, which matters when you're packing multiple meters into a single cabinet. IP40 with connected conductors is standard for enclosed meter panels; no washdown rating here, it's a dry-location part.
Mechanical and environmental specs
Rated for 20,000 mechanical switching cycles typical — that's the expected life of the mechanism, not the electrical endurance at full load (which will be lower at 35 A). Shock resistance is 30 g for 11 ms, 3 impacts minimum, and vibration per IEC 60068-2-6 at 2 g, 20 cycles from 5 to 150 Hz. The locking slide accepts padlocks, wire seals, cable ties, or Antilux seals — useful for utility-lockable meter disconnects. Switch position indicator shows OFF = green, ON = red.