What the 100 kA SCCR means for your panel
The Siemens 3RV2311-1CC20 is a SIRIUS circuit breaker designed specifically for starter combinations — meaning it integrates motor branch protection and disconnecting means in one device, not a general-purpose feeder breaker. Its headline rating is a 100 kA interrupting capacity at 400 V AC, which means it can safely clear a fault current up to 100,000 amps without welding contacts or rupturing the case. That level of SCCR lets you place this breaker downstream of a transformer or busway with high available fault current, avoiding the need for current-limiting fuses upstream in many panel designs. At 690 V the interrupting rating drops to 10 kA — still adequate for most 690 V motor circuits, but worth noting if your service entrance feeds a high-fault 690 V bus.
Mounting and wiring — panel integration
Mounts via screw or snap-on onto 35 mm DIN rail per DIN EN 60715. The 45 mm width means it occupies one standard 45 mm module slot — three of these fit in a 135 mm wide section of rail. Depth is 97 mm, height 106 mm. Clearance requirements: 50 mm above and below, 30 mm to the side, zero forward or backward. Spring-loaded terminals on the main current circuit accept 2x 0.5 to 4 mm² solid or stranded conductors — no lug torqueing, just strip to 8 mm and push in. Mounting position is any, so vertical or horizontal rail orientation works.
Coordination with upstream protection
For selective coordination with a feeder breaker or fuse, the 3RV2311-1CC20 requires a gL/gG backup fuse sized at 25 A for 400 V and 500 V systems, and 20 A at 690 V. That fuse is not included — it's the upstream device that ensures the breaker's 100 kA SCCR is maintained. If you're replacing a 3RV2011-0BA20 in an existing panel, check the fuse sizing: the 3RV2011-0BA20 may have different backup requirements. The 3RV2311-1CC20's spring-loaded terminals also differ from the screw terminals on the 3RV2011-0BA20, so verify the conductor type and ferrule compatibility before swapping.