Panel fit and breaking capacity
The Siemens SIRIUS 3RV2311-4AC20-0BA0 is a circuit breaker designed specifically for starter combinations — meaning it pairs directly with a contactor to provide coordinated motor protection in a single panel footprint. Size S00 keeps the width to 45 mm, so it fits standard 35 mm DIN rail (screw and snap-on mounting per DIN EN 60715) and leaves room for adjacent devices. Depth is 97 mm; clearance requirements are 50 mm upwards and downwards, 30 mm at the sides, and zero forwards or backwards — useful when laying out a dense enclosure. Breaking capacity tells you the fault current it can safely interrupt. At 240 V AC it's rated 100 kA; at 400 V AC it's 55 kA; at 500 V AC it's 10 kA; at 690 V AC it's 4 kA. Those are the AC figures — the ultimate breaking capacity at 400 V is 30 kA, at 690 V it's 2 kA. For backup fuse coordination, the spec calls for gG fuses: 80 A at 240 V, 63 A at 400 V, 50 A at 500 V, 40 A at 690 V. That means the fuse clears the high fault energy while the breaker handles the overload and low-level short — standard Type 2 coordination for a motor branch.
Termination and operating conditions
Main current circuit uses spring-loaded terminals — no screw torque to check, just strip and push. Accepts 2x (0.5 to 4 mm²) solid or stranded. The screwdriver shaft for the auxiliary terminals needs a 3 mm diameter tip, 3.0 x 0.5 mm. Mounting position is any, which simplifies panel layout. Operating temperature range is -50 to +60 °C; storage and transport go to -50 to +80 °C.