What this 80 A MCCB is for
The Siemens 3VA1080-3ED36-0AD0 is a SENTRON molded case circuit breaker rated for 80 A continuous current (Iu) in a 3-pole configuration, built for line protection in distribution panels and motor branch circuits. The TM210 thermal-magnetic trip unit handles overload and short-circuit protection without external power — the thermal element tracks load heating, the magnetic element clears fast faults. Breaking capacity hits 75.6 kA at 240 V and 52.5 kA at 415 V, so it can interrupt high-fault currents upstream of a subpanel or downstream of a transformer without the arc re-striking. The 3 auxiliary switches HQ give remote status feedback for PLC or SCADA inputs.
Breaking capacity across the voltage range
This MCCB's interrupting rating drops as system voltage rises — 75.6 kA at 240 V, 52.5 kA at 415 V, 32 kA at 440 V, and 7.5 kA at 690 V. That 7.5 kA figure at 690 V is the limiting factor for 690 V lineups; verify the available fault current at the installation point doesn't exceed it. The 52.5 kA at 415 V covers most European 400 V industrial panels with headroom for typical transformer secondary faults.
Thermal derating and ambient limits
The 80 A rating holds from 40 °C through 50 °C ambient. Above that, the thermal trip element starts to derate: 76.8 A at 55 °C, 75.2 A at 60 °C, 73.6 A at 65 °C, 72 A at 70 °C. If the panel runs hot — near a drive or transformer — factor that derating into the load calculation. Operating ambient range is -25 °C to 70 °C; storage range is -40 °C to 80 °C.
Mechanical footprint and panel fit
The 3VA1080-3ED36-0AD0 measures 130 mm high, 76.2 mm wide, and 70 mm deep. The 76.2 mm width matches a standard 3-pole MCCB footprint on DIN rail or mounting plate. IP40 on the front means it's protected against tools and wires >1 mm — fine for a closed panel, but not for washdown areas. The 3 auxiliary switches HQ are built in; no separate aux module needed.