Siemens SENTRON 5SV3622-4 — Type B RCCB for Variable-Frequency Loads
The Siemens SENTRON 5SV3622-4 is a short-time delayed residual current circuit breaker (RCCB) with Type B sensitivity, rated 25 A at 40 °C with a 300 mA trip threshold and 10 kA short-circuit current rating. Type B detection covers AC, pulsating DC, smooth DC, and high-frequency residual currents up to 1 kHz — the exact profile a VFD or UPS feed creates. That makes this the RCCB to specify on drives, power supplies, or any inverter-fed branch where a standard Type A would nuisance-trip or miss a fault.
What the Ratings Mean for Panel Fit
The 300 mA residual-current threshold is deliberately high — this is not a personnel-protection device (30 mA would be). It is sized for equipment and fire protection on circuits where natural leakage from input filters and cable capacitance exceeds 30 mA. The short-time delayed characteristic prevents the RCCB from dropping out on transient inrush or surge currents up to 3 kA, which is critical when commissioning a panel full of switch-mode supplies that all hit their input caps at once. Rated 25 A continuous at 40 °C and derated to 25 A all the way up to 70 °C (–) — thermal headroom is flat across the operating band. The 10 kA SCCR and 7 500 A let-through current mean it coordinates with a 10 kA-rated upstream MCB without needing a current-limiting breaker ahead of it. Overvoltage Category III suits fixed-installation distribution panels, not plug-in portable gear.
DIN-Rail Integration and Mounting
Snaps onto standard DIN rail (REG per), 4 modular width units wide (72 mm,), 70 mm deep. Mounting position is unrestricted — horizontal, vertical, upside-down, all fine. Supply can enter from top or bottom; the SIGRES function keeps the test circuit live even when the RCCB is switched off, so the test button works in the off state. IP20 with conductors connected — enclosed panel only, no washdown exposure.