What this MCCB delivers — and where it holds the zone
The Siemens SENTRON 3VA1080-4ED42-0HC0 is a 4-pole molded case circuit breaker rated for 80 A continuous current at 40 °C, with a TM210 thermal-magnetic overcurrent release and an integrated shunt trip (STL) for remote tripping. Its interrupting capacity hits 121 kA at 240 V and 75.6 kA at 415 V — numbers that matter when you're coordinating downstream protection in a distribution panel and need the main breaker to hold through a fault without cascading upstream. The TM210 release means the thermal element handles overloads on a time curve, the magnetic element clears short-circuits instantly. No communication module, no phase-failure detection, no ground-fault monitoring — this is a straight line-protection breaker, sized for a feeder or a large motor branch where you don't need the extra diagnostics.
Derating and panel fit — the numbers that decide the BOM line
At 55 °C the continuous current derates to 76.8 A; at 70 °C it drops to 72 A. If your enclosure runs hot — say a packed panel with drives or transformers — the 80 A nameplate only holds below 50 °C. The 70 mm depth and 101.6 mm width fit a standard MCCB footprint on the DIN rail or mounting plate, but the IP40 front face means the breaker needs an enclosure door or cover to keep dust and tools out. Two auxiliary switches (HQ version) are built in for status feedback to the PLC or panel lamps. The shunt trip (STL) coil lets a safety relay or E-stop circuit drop the breaker remotely — wired correctly, it's the difference between a controlled stop and a man running to the handle.