The Siemens 5SP3735-2KK02 is a 1-pole SENTRON miniature circuit breaker with a 35 A rated current and a 25 kA breaking capacity at 230 V AC. It carries the E tripping characteristic, which means the magnetic trip is calibrated to operate between 10 and 20 times the rated current — a curve designed for protecting circuits with transformers, power supplies, or other loads that draw a brief inrush without nuisance tripping. On a 35 A breaker, that magnetic trip window sits between 350 A and 700 A, so it's a good fit for a distribution board feeding a mix of resistive and moderate inductive loads in a residential or infrastructure setting.
Mounting and wiring — busbar fit, wire range, and enclosure depth
This breaker mounts on a 40-mm busbar system per DIN 43870 Part 2, which is the standard for meter-panel distribution boards in European-style enclosures. It takes solid or stranded copper from 2.5 mm² up to 50 mm², so you can land a fairly heavy feeder on a single-pole device. The overall depth is 89.5 mm, and the enclosure depth allowance is 76.3 mm — that 13 mm difference tells you the busbar and terminal projection sit proud of the backplate, so factor that into your gland-plate and cover clearance.