What this MCCB delivers — and the rating that decides fit
The Siemens SENTRON 3VM1080-3ED32-0AA0 is a 3-pole molded case circuit breaker (MCCB) with a TM210 thermal-magnetic release, rated 80 A at 40 °C. That 80 A is the continuous current it can carry in a 40 °C ambient — the figure you size your feeder cable and upstream protection against. The interrupting ratings climb to 76 kA at 240 V AC, 53 kA at 415 V, and 32 kA at 440 V, so it handles high-fault utility feeds common in North American and European distribution panels. The TM210 designation means a fixed thermal trip and a magnetic (short-circuit) trip that is not field-adjustable — set-and-forget line protection. No undervoltage release, no shunt trip, no ground-fault monitoring built in. If your panel requires those functions, you add them externally or step to the 3VA series. Rated insulation voltage is 800 V. Front-face protection is IP40.
Physical fit — panel integration
Dimensions: 130 mm height, 76.2 mm width (3 inches), 70 mm depth. The 3-inch width is standard for a 3-pole MCCB in a Siemens panelboard or separate enclosure. Depth of 70 mm leaves clearance for rear-connected bus bars or cable lugs in a typical 8-inch deep enclosure. Power loss is 26 W maximum at rated load — factor that into enclosure ventilation if you pack multiple breakers in a small cabinet.
Thermal derating — what the ambient curve tells you
The 80 A rating holds from 40 °C through 50 °C. Above that, it derates: 78 A at 55 °C, 77 A at 60 °C, 75 A at 65 °C, 74 A at 70 °C. If your panel ambient runs hot (near a drive cabinet or in a sun-exposed enclosure), apply the 70 °C value — 74 A — as your continuous current limit.