Its headline rating is 40 A continuous current at 40 °C, with a massive 220 kA breaking capacity at 240 VAC — that means it can safely interrupt a fault current up to 220 kA without welding its contacts or cascading the fault upstream. At 415 V it still holds 154 kA, and at 500 V and 690 V it's rated 17 kA. This is not a motor-protective breaker — its design is explicitly for line protection, meaning it guards cable and busbar feeders against short-circuit and overload.
The UVR means the breaker trips automatically when supply voltage drops below a threshold — typical for safety circuits where a machine must stop on power loss. The auxiliary switches give remote status feedback (open/closed/tripped) to a PLC or indicator lamp.
The breaker occupies a 76.2 mm wide by 130 mm tall by 70 mm deep footprint — standard for a 3-pole SENTRON MCCB in this frame size. The undervoltage release coil wiring and auxiliary switch terminals are accessible from the front; no special panel cutout needed beyond the width allowance.