What it is and what it does
The Siemens SENTRON 3VA1080-2ED42-0CC0 is a 4-pole molded case circuit breaker (MCCB) rated 80 A at 40 °C, designed for line protection in distribution panels. Its interrupting capacity hits 52.5 kA at 240 V and still holds 32 kA at 415 V — enough to clear high-fault industrial feeders without cascading upstream.
Ratings that matter for fit
The 80 A continuous rating holds flat from 40 °C up to 50 °C, then derates gradually to 74 A at 70 °C — so in a warm panel you still get nearly full ampacity. Breaking capacity drops with voltage: 52.5 kA at 240 V, 32 kA at 415 V, 13.6 kA at 440 V, and 7.5 kA at 500/690 V. That 7.5 kA at 690 V is the number to check if you're feeding a 690 V drive bus. Rated insulation voltage is 800 V, so the breaker is rated for 690 V systems with margin. Power loss maxes at 21.7 W — factor that into enclosure thermal calcs if you're packing several breakers side by side.
Built-in auxiliaries and releases
This variant ships with an undervoltage release (UVR) and two auxiliary switches (HQ design). The UVR trips the breaker when control voltage drops, which is standard for emergency-stop or undervoltage protection schemes. No ground-fault monitoring or communication module on this build — it's a straight line-protection MCCB.
Panel fit and mounting
Dimensions are 130 mm high, 101.6 mm wide, 70 mm deep — a standard SENTRON 3VA frame size. Mounts on DIN rail or panel-mount base; the 4-pole width (101.6 mm) matches the usual 4-module MCCB footprint. Depth of 70 mm leaves room for rear-access cable lugs in a 200 mm deep enclosure.