SIRIUS 3RV6311-1EC10 — Motor Circuit Protector for Starter Combinations
The Siemens 3RV6311-1EC10 is a SIRIUS S00-size circuit breaker designed specifically for starter combinations — meaning it integrates overload and short-circuit protection into the motor-starting circuit, saving panel space versus separate devices. Rated 4 A operational current at AC-3 (motor duty) and 690 V, with a magnetic short-circuit trip set to respond at 52 A, it protects downstream contactors and motor windings from fault currents without nuisance tripping on normal starts.
Mounting and Panel Fit
Snaps onto 35 mm DIN rail per DIN EN 60715, or screws directly to a backplate — any mounting position accepted. At 45 mm wide and 96 mm deep, it occupies one standard 45 mm slot in a motor control center (MCC) or panel. Clearance needs: 50 mm above and below for airflow and wiring access, 30 mm at the sides.
Electrical Ratings and Coordination
Rated operational current of 4 A at AC-3 (400 V) means it handles motor loads up to that current in standard starting duty — 15 operations per hour maximum. The magnetic instantaneous trip at 52 A provides Type 2 coordination with downstream contactors, meaning the contactor won't weld under a short circuit up to the breaker's breaking capacity. Insulation voltage rated 690 V with pollution degree 3, surge withstand 6 kV — suitable for 400 V and 690 V line supplies.
Termination and Wiring
Screw-type terminals on top and bottom accept 2 x (0.75 to 2.5 mm²) solid/stranded or 2 x 4 mm², with AWG equivalents 2 x (18 to 12). Finely stranded with ferrules: 2 x (0.5 to 1.5 mm²) or 2 x (0.75 to 2.5 mm²). Torque range 0.8 to 1.2 N·m — no special tooling needed beyond a standard screwdriver.