80 A MCCB with real thermal derating — not just a nameplate number
The Siemens 3VA1080-4ED32-0CA0 is an 80 A SENTRON molded case circuit breaker that actually holds its full rating through 50 °C ambient — 80 A continuous at 40 °C, 45 °C, and 50 °C. Above that it derates linearly to 72 A at 70 °C. That matters when you're stuffing this into a crowded panel where ambient climbs; you don't lose headroom until the enclosure hits 55 °C. The TM210 thermal-magnetic release handles the overload and short-circuit protection curve. Three poles, line protection version — no communication function, no phase failure detection, no ground fault monitoring. This is a straight-ahead feeder or branch breaker, not a multifunction power monitor.
Interrupting capacity that covers most industrial service entrances
Interrupting ratings: 121 kA at 240 V, 75.6 kA at 415 V, 52.5 kA at 440 V, 11.9 kA at 690 V. At typical 480Y/277 V distribution, you're looking at a value between the 415 V and 440 V numbers — well above what most panelboards upstream can deliver. The 690 V figure is lower, so verify coordination if this lands on a 600 V class system. Rated insulation voltage Ui is 800 V, which puts it into IEC 60947-2 territory for industrial use. The IP40 front protection means it's fine inside a closed panel but not exposed to dripping water or dust ingress on the front face.
Active lifecycle — no end-of-life scramble
The integrated auxiliary trip is order code 3VA9608-0BB24 — that's the undervoltage release (UVR) module that ships with this breaker. If you're replacing a unit or stocking spares, make sure that UVR coil matches your control voltage; the base breaker doesn't carry an undervoltage release without that add-on module.
Panel fit — dimensions and mounting
Footprint: 130 mm height, 76.2 mm width, 70 mm depth. That 76.2 mm width is a standard 3-pole MCCB pitch — drops into most DIN-rail or screw-mount panel layouts without re-drilling. Depth of 70 mm leaves room for wiring gutters behind the breaker in a typical 200 mm deep enclosure. No auxiliary contacts onboard, no trip indicator, no voltage trigger. If you need remote status feedback, plan for an external auxiliary contact block or a separate monitoring relay.