What this 80 A MCCB is and what it does
The Siemens 3VA1080-4ED36-0AA0 is a SENTRON-series molded case circuit breaker (MCCB) rated 80 A continuous at 40 °C, with a 3-pole configuration and a TM210 thermal-magnetic trip unit designed for line protection — meaning it handles overload and short-circuit protection on distribution feeders, not motor or generator circuits. Its breaking capacity reaches 121 kA at 240 VAC and 75.6 kA at 415 VAC, dropping to 11.9 kA at 690 VAC — figures that tell you where this breaker has the headroom for high-fault installations and where it needs upstream coordination. The TM210 overcurrent release is a fixed thermal-magnetic unit — no interchangeable rating plugs, no electronic adjustments. You set the breaker at 80 A and it stays there. That simplifies ordering but means the trip curve is baked in; if your load profile needs a wider magnetic pickup window, you step to the 3VA11 frame with an electronic trip.
Thermal derating and panel fit
At 40 °C the breaker carries a full 80 A. It holds that rating through 50 °C, then begins a gentle taper: 78 A at 55 °C, 77 A at 60 °C, 75 A at 65 °C, and 74 A at 70 °C. If your panel ambient runs above 50 °C, the continuous current you can actually pull is the derated figure — plan the load schedule accordingly. The case dimensions are 130 mm high, 76.2 mm wide, and 70 mm deep — a 3-pole MCCB that fits standard SENTRON mounting footprints. The front face carries IP40 protection, so it's fine inside a closed panel but not for washdown zones. Maximum power loss is 19.2 W per pole at rated current. That's the heat you need to evacuate in a sealed enclosure; if you're stacking multiple breakers in a small gland plate, factor the cumulative dissipation into your thermal analysis.
Breaking capacity by voltage — where it fits
The interrupting ratings span the common distribution 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. The steep drop above 500 V tells you this breaker is optimized for 240–480 V systems where fault currents are highest. At 690 V the 11.9 kA rating is adequate for most industrial loads but check your available fault current before committing the BOM line.