SIRIUS 3RV6321-4CC10 — motor branch circuit breaker for starter combinations
Rated 22 A in AC-3 duty at 400 V, so it handles motor loads up to that current — typical for a 7.5 kW to 11 kW induction motor depending on service factor. The instantaneous short-circuit trip fires at 286 A, clearing faults before the contactor welds. The Size S0 frame (45 mm wide, 96 mm deep, 97 mm tall) fits standard 45 mm module spacing — one slot on the rail. Screw-type terminals on top and bottom accept 2x 1–2.5 mm² solid/stranded or 2x 2.5–10 mm², with a tightening torque of 2–2.5 N·m. The magnetic short-circuit trip is non-adjustable; the thermal overload element is set by the factory to the 22 A rating.
Clearance and integration
Requires 50 mm clearance above and below the device, 30 mm at the sides, and zero forwards or backwards — so it fits tight against the backpanel or enclosure wall. Total power loss is 8 W typical. Rated insulation voltage 690 V AC at pollution degree 3, surge voltage resistance 6 kV — suitable for 400/480 V line-to-line systems with adequate clearance. Shock resistance 25g / 11 ms per IEC 60068-2-27.
RoHS compliance date is 05/01/2012. The part carries the SIRIUS brand.