The Siemens SENTRON 5SV3644-7 is a selective Type F residual-current circuit breaker (RCCB) — 4-pole, rated 40 A at AC, with a 300 mA trip threshold and a 10 kA short-circuit current rating. Selective design means it coordinates with downstream RCCBs: during a fault on a sub-circuit, this unit stays closed so only the nearest device trips, keeping the rest of the distribution board live. Type F detection handles mixed-frequency residual currents — 50 Hz fundamental plus higher harmonics from frequency converters, washing-machine drives, or EV chargers — where a standard Type A might nuisance-trip or miss the fault entirely. The 300 mA threshold is typical for fire-protection or selective main-switch applications, not personnel shock protection (30 mA is the touch-safe limit).
Any mounting position is permitted. The IP20 rating applies once the distribution board is installed with connected conductors; during panel build, keep the terminals covered. The 70 mm depth matches standard shallow enclosures — no extra gland-plate clearance needed.