What this MCCB delivers on the line side
The Siemens SENTRON 3VA1180-4EF42-0AA0 is a 4-pole molded case circuit breaker rated 80 A continuous at 40 °C, with a TM240 thermal-magnetic overcurrent release. It's designed for line protection — the primary disconnect and fault interrupter in a distribution panel. The interrupting rating hits 121 kA at 240 V, which gives substantial SCCR headroom for most industrial service-entrance or feeder applications. Rated insulation voltage is 800 V, so it handles 480Y/277 V and 600 V delta systems comfortably. The 19.2 W maximum power loss at rated load means panel heat buildup is manageable — no forced cooling needed in a typical enclosure with natural convection.
Interrupting capability across voltage levels
The interrupting ratings step down cleanly as voltage rises: 121 kA at 240 V, 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at both 500 V and 690 V. That 11.9 kA at 690 V is the limiting case — if your fault current at that voltage exceeds it, you need a higher-rated frame. For most 480 V panels, the 52.5 kA at 440 V is the relevant figure; derate slightly for the actual 480 V operating point.
Thermal derating and ambient conditions
The breaker holds 80 A from 40 °C up to 50 °C without derating. At 55 °C it drops to 78 A, at 60 °C to 77 A, at 65 °C to 75 A, and at 70 °C to 74 A. If your panel ambient runs above 50 °C, size the upstream conductor and load for the derated value. Operating range is -25 °C to 70 °C; storage range is -40 °C to 80 °C.
Physical fit and panel integration
Dimensions: 130 mm height, 101.6 mm width, 70 mm depth. The 4-pole width (101.6 mm) is standard for a 4-pole MCCB in this frame size — verify the mounting footprint matches your existing DIN rail or panel-mount adapter. Front protection is IP40, so it's fine for a clean indoor panel but not for washdown environments.