Siemens 3VA1080-4ED36-0AF0 — 80 A SENTRON MCCB for Line Protection
It carries a 121 kA interrupting capacity at 240 V AC, which drops to 75.6 kA at 415 V and 52.5 kA at 440 V — enough headroom for most industrial service-entrance or feeder applications where high fault current is a concern. The TM210 thermal-magnetic trip unit provides fixed thermal and magnetic settings, so this breaker is a straight swap-in for a panel already specified around that trip curve. The auxiliary switch configuration (1 auxiliary + 1 trip alarm switch HQ) gives remote status and trip indication without needing an add-on module.
Interrupting Ratings and Thermal Derating
The interrupting capacity is specified at multiple voltages: 121 kA at 240 V, 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at both 500 V and 690 V. These are the SCCR values the breaker can clear without welding or rupturing — critical for coordination studies. Thermal derating is minimal up to 50 °C — the breaker holds its full 80 A rating. Above that it steps down: 78 A at 55 °C, 77 A at 60 °C, 75 A at 65 °C, and 74 A at 70 °C.