What it is and what it does
This is a Siemens SENTRON 3VA1080-4ED42-0HH0 molded case circuit breaker (MCCB) built for line protection in power distribution panels. It's a 4-pole unit rated 80 A continuous at 40 °C, with a breaking capacity of 121 kA at 240 V AC — that's the fault current it can safely interrupt without welding contacts or venting plasma. At 415 V AC it still handles 75.6 kA, so it's sized for industrial switchboards where high available fault current is common. The insulation voltage is rated 800 V, which means the internal clearances and creepage distances are designed for 690 V systems with margin. Power loss at full load runs 19.2 W — not trivial in a sealed enclosure, so factor that into thermal calculations.
What the ratings mean for fit
The 80 A rating holds from 40 °C through 50 °C, then derates gently: 78 A at 55 °C, 77 A at 60 °C, 75 A at 65 °C, 74 A at 70 °C. That's a shallow slope — you don't lose much headroom in a warm panel. The operating range is -25 °C to 70 °C, storage from -40 °C to 80 °C, so it's fine for unheated electrical rooms. Breaking capacity drops as voltage climbs: 52.5 kA at 440 V, 11.9 kA at 500 V and stays at 11.9 kA at 690 V. That's typical for an 80 A frame — the arc energy scales with voltage, so the same mechanism can't quench as high a current. For 400 V class systems (415 V nominal), you've got 75.6 kA, which covers most industrial service entrances.
Panel integration and accessories
It ships with a shunt trip (STL) as the auxiliary release, plus two auxiliary switches and one trip alarm switch (HQ configuration). That's enough for remote tripping and status feedback — common for E-stops or PLC-driven load shedding. No undervoltage release fitted, no ground-fault monitoring module, no communication function. If you need those, the 3VA family supports field-installable accessory kits, but this order code comes bare of those options. Dimensions: 130 mm high, 101.6 mm wide, 70 mm deep. The trip indicator and voltage trigger are present.