It combines a circuit breaker and a thermal-magnetic overload relay in one device, so it disconnects the motor under both short-circuit and sustained overload conditions.
Breaking capacity — the number that matters for fault coordination
At 240 V AC the rating is the same 100 kA, so it holds up across common industrial supply voltages.
Any mounting position is allowed, which simplifies panel layout — no derating for horizontal vs vertical orientation. Dimensions are 45 mm wide by 106 mm high by 97 mm deep, so it occupies a standard 45 mm module width on the rail. Clearance distances: 50 mm above and below, 30 mm to the side, and zero forward or backward — meaning it can be stacked against the back panel or enclosure wall without extra air gap. No screw torque to verify — just strip and insert.
It is still the active catalog number from Siemens for this rating and frame.