Motor Starter Circuit Breaker for High-Fault Panels
The Siemens SIRIUS 3RV2311-1JC20 is a circuit breaker designed for starter combinations — meaning it integrates motor branch protection and disconnecting means in one device, sized for a 35 mm DIN rail enclosure. Its headline figure is 100 kA breaking capacity at 400 V AC, which tells a panel builder this breaker can safely interrupt a fault current up to that level without upstream fuses needing to clear first — a key spec for high-SCCR industrial panels where the available fault current is known to be high. Mounting is via screw or snap-on onto standard 35 mm DIN rail per DIN EN 60715, and the main current circuit uses spring-loaded terminals — no screw torque to verify, just strip and push.
Dimensions and Spacing for Panel Layout
The breaker measures 45 mm wide, 106 mm tall, and 97 mm deep — a compact footprint that fits standard 45 mm module spacing on the DIN rail. Clearance requirements: 50 mm above and below, 30 mm to the side, and 0 mm forward or backward — meaning it can be mounted flush against a backplane or enclosure wall without derating.