SIRIUS S2 motor protection circuit breaker — 3RV2031-4UB10-0BA0
It delivers 11 kW at 230 V and carries a Trip Class 20 characteristic, meaning it allows a 20-second thermal trip at 7.2× rated current — suited for motor starts with moderate inertia like pumps and compressors. Rated operational voltage spans 20 to 690 V. No ground-fault detection on this variant.
The S2 frame occupies 55 mm width, 140 mm height, 149 mm depth — a standard footprint that fits alongside SIRIUS contactors in a motor starter lineup. Mounting position is any orientation. No additional fuse is required at 240 V; at 400 V the upstream fuse is gG 125 A, at 500 V gG 100 A, at 690 V gG 80 A. Screw-type terminals for the main circuit accept 2× (1 to 25 mm²) or 1× (1 to 35 mm²) solid or stranded copper. The screwdriver shaft diameter is 5 to 6 mm, Pozidriv size 2 tip. Main contact screws are M6.