What this MCCB is and where it fits
The Siemens SENTRON 3VA1080-3ED42-0AF0 is a 4-pole molded case circuit breaker (MCCB) rated for line protection — meaning it sits at the feeder or branch level in a distribution panel, guarding cables and busbars against overload and short circuit. It carries a rated continuous current Iu of 80 A and a TM210 thermal-magnetic release, so the thermal element handles sustained overloads while the magnetic element clears high fault currents fast. The interrupting ratings climb with voltage: 75.6 kA at 240 V, 52.5 kA at 415 V, 32 kA at 440 V, and 7.5 kA at 690 V — the 240 V and 415 V figures are the ones that matter for most industrial low-voltage panels. The rated insulation voltage Ui is 800 V, which gives headroom for 690 V systems without derating the insulation path.
Thermal derating and panel integration
The 80 A rating holds flat from 40 °C to 50 °C — 80 A at each of those ambient points. Above 50 °C it begins to step down: 76.8 A at 55 °C, 75.2 A at 60 °C, 73.6 A at 65 °C, and 72 A at 70 °C. If the panel ambient runs at 60 °C, plan for 75.2 A continuous, not the full 80 A. The enclosure footprint is 130 mm high, 101.6 mm wide, and 70 mm deep — a standard MCCB slice that fits most DIN-rail or mounting-plate layouts. IP40 on the front means the breaker face is protected against tools and wires larger than 1 mm, but the body is not sealed against water; keep it inside a rated enclosure for wet or washdown areas. It ships with 1 auxiliary switch and 1 trip alarm switch (HQ type), so you get a remote status signal without adding a separate accessory block.