SENTRON 3VA1180-6EF32-0AF0 — 80 A MCCB with 220 kA interrupting capacity
The Siemens SENTRON 3VA1180-6EF32-0AF0 is a 3-pole molded case circuit breaker (MCCB) rated 80 A at 40 °C, designed for line protection in distribution panels and industrial switchgear. Its headline feature is the 220 kA breaking capacity at 240 V — that means it can safely interrupt fault currents up to 220,000 A without cascading failure upstream, which is critical for high-fault installations like transformer secondaries or large motor control centers. The TM240 thermal-magnetic release provides fixed overload and short-circuit protection, with a trip indicator for visual fault confirmation. Rated insulation voltage is 800 V, and the breaker carries a 154 kA interrupting rating at 415 V, 121 kA at 440 V, and 17 kA at both 500 V and 690 V. This derating curve tells you the available fault current the breaker can handle drops significantly above 440 V — at 690 V you're limited to 17 kA, so verify the point-of-fault current at your system voltage before specifying.
Thermal derating and enclosure fit
The breaker holds its full 80 A rating from 40 °C through 50 °C, then derates to 78 A at 55 °C, 77 A at 60 °C, 75 A at 65 °C, and 74 A at 70 °C. If your panel ambient runs above 50 °C, the continuous current capability drops by roughly 1 A per 5 °C step — factor that into your load calculation. Maximum power loss is 19.2 W, which matters for heat buildup in a sealed enclosure. Physical dimensions: 130 mm height, 76.2 mm width (3 inches — standard MCCB footprint), and 70 mm depth. The 70 mm depth is the dimension from the mounting surface to the front of the breaker — check your enclosure depth clearance, especially if you're retrofitting into an existing panel with a shallower door. Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C.