The Siemens 3VA1180-3EF32-0KC0 is a SENTRON molded case circuit breaker (MCCB) rated for 80 A continuous current at 40 °C, built for line protection in three-phase distribution panels. The 3-pole frame carries a TM240 thermal-magnetic release — the thermal element handles overloads, the magnetic element clears short circuits — and the interrupting ratings climb to 75.6 kA at 240 V, 52.5 kA at 415 V, and 32 kA at 440 V. That 52.5 kA at 415 V is the number that matters for most industrial 400 VAC switchgear: it tells you this breaker can safely interrupt a fault up to that level without upstream fuses needing to clear first, which buys you selectivity headroom in a distribution board.
Ratings and fit
The 80 A frame holds its full rating from 40 °C through 50 °C — no derating needed in a warm panel. At 55 °C it steps down to 76.8 A, then 75.2 A at 60 °C, 73.6 A at 65 °C, and 72 A at 70 °C. If your panel ambient runs over 50 °C, the 80 A continuous current is still good for about 72 A at the top end of the operating range. The rated insulation voltage is 800 V, so it's comfortable on 480 V and 600 V class systems as well. The breaker includes two auxiliary switches (HQ type) for remote status feedback — one normally open, one normally closed — and a shunt trip (STL) for remote tripping. The shunt trip coil part number is 3VA9688-0BL33. There is no undervoltage release, no ground-fault monitoring, no phase-failure detection, and no communication function. This is a straightforward line-protection breaker: thermal-magnetic, manually operated, with a voltage-trip option for emergency-off circuits.
Physical integration
The breaker measures 130 mm high, 76.2 mm wide, and 70 mm deep. It mounts on a DIN rail or screws directly into a panel backplate. The front face carries an IP40 rating — protected against tools and small wires, but not sealed against dust ingress or washdown. Keep it inside a cabinet, not out on the floor.