What the interrupting ratings mean for your panel
The Siemens 3VA1080-4ED36-0AH0 is a SENTRON molded case circuit breaker (MCCB) built for line protection in distribution panels. It carries 80 A continuously at 40 °C through 50 °C, then derates to 74 A at 70 °C — so if your panel ambient runs hot, you still have headroom at the 80 A frame. The interrupting ratings are where this part earns its keep: 121 kA at 240 V, 75.6 kA at 415 V, and 52.5 kA at 440 V. That means it can clear a bolted fault at those levels without the arc re-striking or the case rupturing, which is the difference between a coordinated trip and a cascading failure upstream. At 690 V it still holds 11.9 kA, so it handles industrial 480Y/277 V or 600 V class systems without a second thought.
Footprint and panel integration
The 3VA1080-4ED36-0AH0 measures 130 mm tall, 76.2 mm wide, and 70 mm deep. That 3-inch width is standard for a 3-pole MCCB in the SENTRON 3VA frame — it drops into the same DIN-rail or screw-mount footprint as other 3VA breakers of the same pole count. The auxiliary switch configuration (2 aux + 1 trip alarm HQ) is factory-fitted, so you don't need to add a side-mount accessory later. Rated insulation voltage is 800 V, and the operating range is -25 °C to 70 °C, with storage from -40 °C to 80 °C.