What it is and what it does
The Siemens 3VA1080-3ED32-0DC0 is a SENTRON molded case circuit breaker (MCCB) designed for line protection in distribution panels. Three poles, rated 80 A at 40 °C, with a breaking capacity of 75.6 kA at 240 V AC — that's the headline number for fault clearing on a 240 V line, and it steps down to 52.5 kA at 415 V and 32 kA at 440 V, so the SCCR you need for your transformer secondary or service entrance determines which voltage column you read. Rated insulation voltage is 800 V, meaning the internal creepage and clearance are sized for 690 V systems without derating the insulation base. Maximum power loss at rated load is 21.7 W — that's the heat the panel builder has to vent; it's not a selection parameter but it matters for enclosure sizing if you're stacking several of these on a DIN rail.
Ratings that decide fit
Current rating holds flat at 80 A from 40 °C through 50 °C, then tapers to 78 A at 55 °C, 77 A at 60 °C, 75 A at 65 °C, and 74 A at 70 °C. That's a gentle derating curve — you lose only 6 A over a 30 °C rise — so in a warm panel you still have most of the 80 A frame. Operating temperature range is -25 °C to +70 °C; storage range is -40 °C to +80 °C. This breaker includes an undervoltage release (UVR) as the auxiliary release type, and it comes with two auxiliary switches HQ. The trip indicator is not present, and there is no voltage trigger or communication function — it's a straightforward line-protection MCCB without ground-fault monitoring. The design of the supplied basic switch is 3VA10803ED320AA0.
Panel integration
Dimensions are 130 mm height, 76.2 mm width, 70 mm depth — a 3-pole MCCB footprint that fits standard Siemens SENTRON panel mounting. The 70 mm depth is shallow enough for most 200 mm deep enclosures; the 76.2 mm width (3 inches) is the pole pitch you'd expect for a three-pole 80 A frame.