80 A MCCB for line protection — active, spec'd out
The Siemens 3VA1080-3ED36-0JH0 is an active-production SENTRON molded case circuit breaker rated for 80 A continuous at 40 °C ambient, 3-pole, built for line protection duty. Breaking capacity hits 75.6 kA at 240 V, dropping to 52.5 kA at 415 V and 32 kA at 440 V — enough for most industrial distribution panels fed by a medium-voltage transformer. Insulation voltage is rated 800 V, so it's comfortable on 480/277 V or 400/230 V systems without de-rating the insulation. This is not a motor-protection breaker — the product design is explicitly "line protection," meaning it's sized for feeder and branch-circuit overcurrent protection, not for overload relay coordination on a motor start profile. If you're replacing a breaker on a pump or compressor feeder, this fits; if you need a combination motor starter, look at the 3VA1 with electronic trip for motor applications.
DIN-rail footprint and thermal derating
Dimensions are 76.2 mm wide (3 in), 130 mm tall (5.12 in), 70 mm deep (2.76 in). The depth is 70 mm. Thermal derating is published stepwise: 80 A flat from 40 °C through 50 °C, then 78 A at 55 °C, 77 A at 60 °C, 75 A at 65 °C, 74 A at 70 °C. If your panel ambient runs 55 °C+ (tightly packed enclosure, no forced air), you lose 2–6 A off the nameplate. Operating range is -25 °C to 70 °C; storage from -40 °C to 80 °C.
Auxiliaries and accessories onboard
Factory-fitted with a shunt trip (STL) release and a configuration of 2 auxiliary switches plus 1 trip alarm switch (HQ). That's enough for remote trip indication and status feedback to a PLC or SCADA — no need to buy an add-on accessory block for basic signaling. The base switch is order code 3VA10803ED360AA0, so if you ever need a bare breaker without auxiliaries, that's the stripped variant. Power loss is listed at 19.2 W maximum — not negligible in a sealed enclosure with other heat sources. Account for it in the thermal budget if the panel is borderline.