The Siemens 5SV3645-6 is a 4-pole residual current circuit breaker (RCCB) from the RCCBs family, rated 125 A with a 300 mA sensitivity, Type A, for 400 V AC systems. Type A detection means it trips on sinusoidal AC residual currents and on pulsating DC residual currents up to 6 mA — the standard for circuits feeding single-phase rectifiers, switching power supplies, or variable-speed drives where the fault waveform isn't a clean sine. The 300 mA rating suits it for fire protection or general shock prevention in distribution boards where nuisance tripping from leakage on long cable runs or filter caps needs to be avoided.
Lifecycle & Sourcing
RoHS compliance is confirmed since 02 June 2023; REACH candidate-list information is available per Article 33. Export control is straightforward — AL: N, ECCN: EAR99 — no special license required for most destinations.
Integration Notes
Four-pole (3P+N) form factor clips onto standard DIN rail inside a distribution board or sub-panel. The 125 A frame means incoming cable and busbar sizing should match — this is a main or heavy-feeder RCCB, not a branch-circuit unit. Packaged singly (1 piece), dimensions 78 x 97 x 85 mm — verify panel cutout depth before mounting.