What this MCCB carries for a panel build
The Siemens 3VA1180-5EF36-0KH0 is a 3-pole SENTRON molded case circuit breaker rated 80 A at 40 °C, with a 187 kA interrupting capacity at 240 V — that figure drops to 121 kA at 415 V and 75.6 kA at 440 V, so for a 480 V panel you are working with the 415 V curve. The 800 V rated insulation voltage means the breaker is built for the full low-voltage distribution range, not just 240 V branch circuits. Power loss runs 19.2 W max, which matters for thermal coordination inside a sealed enclosure. This is a line-protection design — no ground-fault monitoring, no undervoltage release, no communication module. The auxiliary switch complement is 2 auxiliary switches plus 1 trip alarm switch HQ, and the shunt trip (STL) release is fitted for remote tripping. The 70 mm depth and 76.2 mm width fit the standard SENTRON 3VA footprint, so it drops into a panel already laid out for the series without re-drilling the mounting plate.
Thermal derating and ambient range
The breaker holds 80 A continuously from 40 °C through 50 °C. At 55 °C it derates to 78 A, at 60 °C to 77 A, at 65 °C to 75 A, and at 70 °C to 74 A. Operating ambient spans -25 °C to 70 °C; storage range is -40 °C to 80 °C. For a panel that sees 55 °C internal air, the continuous load must stay under 78 A — the spec table gives the exact curve, no guessing.