The Siemens 3VA1080-4ED42-0KC0 is a SENTRON molded case circuit breaker (MCCB) designed for line protection in distribution panels. It's a 4-pole unit rated 80 A at 40 °C, with an interrupting capacity of 121 kA at 240 V and 75.6 kA at 415 V — high enough for most main or feeder applications behind a transformer.
Ratings and what they mean for fit
The 80 A continuous rating holds across 40 °C to 50 °C, then derates to 74 A at 70 °C — useful if the breaker sits in a warm enclosure or near other heat sources. The 121 kA interrupting rating at 240 V means it can clear a bolted fault at that level without rupturing; at 415 V the rating drops to 75.6 kA, and at 690 V to 11.9 kA. For a 480 V panel, the 75.6 kA at 415 V is the closest published figure — typically sufficient for a service entrance or large feeder if the available fault current stays under that curve. Rated insulation voltage is 800 V, so the breaker can be used in 690 V systems with appropriate coordination. The 4-pole design covers three-phase plus neutral switching, common in North American and European panel builds.
Panel integration
The breaker measures 101.6 mm wide, 130 mm tall, and 70 mm deep — a standard MCCB footprint that fits most DIN-rail or panel-mount enclosures without re-drilling. It ships with a shunt trip (STL) auxiliary release and two auxiliary switches HQ, so you can integrate remote tripping and status feedback into the control circuit without adding external relays.