The Siemens 3VA1080-4ED32-0AH0 is a SENTRON molded case circuit breaker (MCCB) rated for line protection. It carries 80 A continuous at 40 °C through three poles, with a TM210 thermal-magnetic overcurrent release that's fixed — no field-swap trip units here. The 121 kA breaking capacity at 240 V gives serious fault-clearing headroom for high-available-fault panelboards or transformer secondaries, and it still holds 75.6 kA at 415 V and 52.5 kA at 440 V. That's the kind of interrupting rating that keeps selectivity intact downstream without cascading upstream breakers.
Thermal derating and ambient reality
This MCCB holds its full 80 A rating from 40 °C up through 50 °C — no derating needed in a warm control room. At 55 °C it drops to 76.8 A, at 60 °C to 75.2 A, and at 65 °C to 73.6 A, bottoming at 72 A at 70 °C. That's a shallow curve; you lose only 10 % at the top of the operating range. If your panel sits near a kiln or a hot process line, you can still load it close to nameplate without oversizing. The operating temperature range spans -25 °C to 70 °C, and storage from -40 °C to 80 °C — sealed against the grit and rated for the heat, not the office.
Physical fit and panel integration
Dimensions are 130 mm high, 76.2 mm wide, 70 mm deep — a compact 3-pole footprint that fits standard MCCB panel cutouts. The front face carries IP40 protection, so it's fine in a clean indoor enclosure but not for washdown areas. It ships with 2 auxiliary switches plus 1 trip alarm switch (HQ type) already fitted, which saves a wiring pass if you need remote status or a shunt trip monitoring circuit. No undervoltage release, no ground-fault module, no communication function — this is a straight line-protection breaker with the aux contacts as the only add-on.