The Siemens 3VA1180-3EE32-0KH0 is a SENTRON molded case circuit breaker (MCCB) rated 80 A continuous at 40 °C, with a 75.6 kA interrupting capacity at 240 V — that's the number that tells you it'll clear a hard fault downstream without welding its contacts shut. It's a 3-pole unit built for line protection, meaning it guards the feeder, not a specific motor or load. That auxiliary stack gives you remote status — open/closed and tripped — without adding a separate module. The shunt trip lets you drop the breaker remotely via a control signal, which is handy for emergency-off circuits or PLC-driven load shedding.
Breaking capacity across voltages — the selectivity story
At 240 V it interrupts 75.6 kA; at 415 V that drops to 52.5 kA; at 440 V it's 32 kA; at 500 V and 690 V it holds at 11.9 kA. Those numbers govern your selectivity study — if your upstream transformer can push 65 kA at 480 V, this breaker at 32 kA (440 V) won't coordinate unless you step up to a higher-rated frame upstream. For a 240 V delta panel or a 400 V wye with moderate fault current, it's a solid fit.
Thermal derating and ambient reality
At 55 °C it's 78 A, at 60 °C it's 77 A, at 65 °C it's 75 A, and at 70 °C it's 74 A. The max power loss is 19.2 W, which matters for enclosure heat calc if you're stacking several breakers.