What this MCCB is and what it does
The Siemens SENTRON 3VA1180-3EF36-0CC0 is a 3-pole molded case circuit breaker (MCCB) rated 80 A at 40 °C, designed for line protection in industrial distribution panels. Its interrupting capacity reaches 75.6 kA at 240 V AC, 52.5 kA at 415 V, and 32 kA at 440 V — numbers that tell you it can handle high-fault scenarios typical of large motor control centers or transformer secondaries without needing an upstream current-limiting fuse. The breaker ships with an undervoltage release (UVR) and two HQ auxiliary switches integrated, so it's ready for remote status monitoring and undervoltage protection out of the box. No separate add-on kit needed for those functions. Rated insulation voltage is 800 V, and the unit dissipates a maximum of 21.7 W — a number to factor into enclosure thermal calculations if you're packing several breakers side by side.
Sizing and derating for real-world panels
The 80 A rating holds steady from 40 °C up to 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, you'll need to account for that 6 A drop at the top end. Dimensions are 130 mm high, 76.2 mm wide, 70 mm deep — a standard 3-pole MCCB footprint that fits most DIN-rail or panel-mount enclosures without surprises. The 70 mm depth is shallow enough for shallow backboxes. Operating temperature range is -25 °C to +70 °C; storage range is -40 °C to +80 °C. That storage minimum matters if the breaker sits in an unheated warehouse before install.