The Siemens SENTRON 3VA1180-6EF36-0BC0 is a 3-pole molded case circuit breaker rated for 80 A continuous current at 40 °C, with a breaking capacity of 220 kA at 240 VAC — that's the headline number for fault clearing on a high-available-fault-current bus, like a main or tie breaker in a large distribution panel. At 415 VAC it still clears 154 kA, and at 690 VAC it holds at 17 kA.
Thermal derating — where the 80 A holds and where it drops
At 55 °C it derates to 78 A, at 60 °C to 77 A, and at 70 °C to 74 A. That's a mild slope — only 6 A lost over a 30 °C rise — meaning the breaker runs cool and the bimetal curve stays tight. For a panel that sees 55 °C ambient (common in a packed enclosure with drives upstream), you still get 78 A continuous without nuisance tripping.
The 76.2 mm width (3 inches) is standard for a 3-pole SENTRON 3VA frame; it clips onto the DIN rail or mounts with screws. No communication function, so no slot for a comm module — this is a straight line-protection device with a UVR trip coil.