What this MCCB carries — and what it means on the critical path
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. It's a 3-pole unit with a TM210 thermal-magnetic release, meaning the thermal element handles overloads and the magnetic element handles short circuits, no electronic adjustment. The undervoltage release (UVR) is built in, so if control voltage drops below the dropout threshold, the breaker trips — standard for safety circuits that need to drop a load on loss of control power.
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. If your panel's available fault current at the line terminals is, say, 25 kA at 415 V, this breaker clears it with headroom. At 690 V the 7.5 kA rating is the limit; don't put it on a bus with higher prospective fault current at that voltage.
Thermal derating — the real-world current you can run
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 enclosure ambient runs at 55 °C, you're at 78 A continuous — still close to the nameplate, but not the full 80 A. The operating temperature range is -25 °C to 70 °C, storage from -40 °C to 80 °C.
Panel fit — dimensions and mounting
The breaker measures 130 mm high, 76.2 mm wide, 70 mm deep. That's a standard 3-pole MCCB footprint for the SENTRON 3VA platform — mounts on a DIN rail or directly to a backplate via the integral mounting slots. The 70 mm depth means it clears most 200 mm deep enclosures with room for wiring channels behind it.
Power loss and thermal management
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.