The Siemens 3VA1080-2ED36-0CA0 is a SENTRON molded case circuit breaker (MCCB) rated 80 A at 40 °C, with a 52.5 kA interrupting capacity at 240 V — that's the headline number for fault clearing on a 240 V line side.
Breaking capacity — what the voltage columns tell you
The interrupting rating drops as system voltage rises: 52.5 kA at 240 V, 32 kA at 415 V, 13.6 kA at 440 V, and 7.5 kA at 500 V and 690 V. That's typical for an MCCB — the arc extinction gets harder at higher voltages.
Thermal derating — the real-world current you can run
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 enclosure ambient runs at 55 °C, you're at 78 A continuous — still close to the nameplate, but not the full 80 A.
Panel fit — dimensions and mounting
Maximum power dissipation is 21.7 W at rated current. That's the heat the breaker dumps into the enclosure. In a sealed panel with multiple breakers side by side, that heat adds up — factor it into your thermal budget if you're running near the derating curve.