What it is and what it does
The Siemens 5SV3626-4 is a 2-pole residual current circuit breaker (RCCB) from the SENTRON family, rated 63 A at 40 °C with a 300 mA tripping fault current and Type B residual current sensitivity. Type B means it detects smooth DC residual currents, AC sinusoidal residuals, and pulsed DC — the full spectrum you get from variable-speed drives, UPS systems, and PV inverters. The short-time delayed design gives it selectivity upstream of standard RCCBs, so a downstream fault clears without taking this device out. Rated short-circuit current withstand is 10 kA per IEC 61008-1, with an I²t value of 70,000 A²·s.
Deployment context
Snaps onto a DIN rail in any mounting position, occupying 4 modular width units at 72 mm wide. Depth is 70 mm — check your enclosure depth before committing; some shallow consumer units won't clear it. IP20 with connected conductors means it's for enclosed distribution boards, not washdown areas. Rated for 50 Hz supply and overvoltage category III.
Thermal derating and ambient limits
Holds 63 A continuous from 40 °C up to 60 °C (–). At 65 °C it derates to 55 A; at 70 °C to 48 A. Operating ambient range is -25 °C to 45 °C; storage range is -40 °C to 75 °C. If you're mounting it in a hot panel near drives or transformers, factor the 65 °C derating step into your load budget.