The Siemens SENTRON 3VA1180-3EF32-0DC0 is a 3-pole molded case circuit breaker (MCCB) rated 80 A at 40 °C, designed for line protection in distribution panels. Its 75.6 kA breaking capacity at 240 V gives headroom for high-fault utility feeds or transformer secondaries where the available fault current is substantial. The 800 V rated insulation voltage means it can sit on 690 V line-to-line systems without derating the insulation — common in industrial 690 V networks.
Thermal derating and breaking capacity
The 80 A rating holds flat from 40 °C through 50 °C (–). Above that it derates: 78 A at 55 °C, 77 A at 60 °C, 75 A at 65 °C, and 74 A at 70 °C (–). For a panel running warm — say 55 °C inside a sealed enclosure — the breaker still carries 78 A continuous, so you don't lose a full frame step. Breaking capacity drops with voltage: 75.6 kA at 240 V, 52.5 kA at 415 V, 32 kA at 440 V, and 11.9 kA at 500 V and 690 V (–).
The 3VA1180-3EF32-0DC0 measures 70 mm deep, 76.2 mm wide, and 130 mm tall (–). That 76.2 mm width — 3 inches — is a standard MCCB footprint for 3-pole SENTRON breakers, so it drops into existing busbar or lug kits without re-drilling the backplane.