Siemens 3RV2311-1KC10 – SIRIUS Circuit Breaker for Starter Combinations
The Siemens 3RV2311-1KC10 is a SIRIUS circuit breaker designed specifically for starter combinations, meaning it integrates directly into motor starter assemblies where short-circuit and overload protection are required in one compact package. Its 100 kA breaking capacity at 400 V AC (and 100 kA at 240 V) means it can safely interrupt high-fault-current faults without upstream fuses needing to clear first — a key spec for panels with high available short-circuit current. At 690 V the interrupting rating drops to 4 kA, so for 690 V feeders verify the available fault current is within that limit.
Mounting and Integration
Mounts via screw or snap-on onto 35 mm DIN rail per DIN EN 60715, in any orientation. Width is 45 mm, depth 97 mm, height 97 mm — fits standard panel cutouts and leaves clearance: 50 mm above and below, 30 mm to the side, zero forward or backward. Main circuit terminals are screw-type, accepting 2x (0.75–2.5 mm²) solid/stranded or 2x 4 mm².
Coordination and Ratings
For fuse backup coordination, the maximum permitted upstream fuse rating is gL/gG 63 A at 400 V, 50 A at 500 V, and 40 A at 690 V — useful when designing selective coordination with a downstream motor branch. Rated operational voltage spans 20 to 690 V, covering most low-voltage industrial supplies. Maximum switching frequency under AC-3 duty is 15 operations per hour — a reminder this is a protection device, not a contactor for frequent cycling.