What this MCCB is and what it does
The Siemens SENTRON 3VA1080-3ED32-0AC0 is a 3-pole molded case circuit breaker (MCCB) designed for line protection in distribution panels. It carries an 80 A continuous rating at 40 °C ambient, with a TM210 thermal-magnetic overcurrent release that handles both overload and short-circuit conditions. The interrupting capacity hits 75.6 kA at 240 V and still delivers 52.5 kA at 415 V — enough for most industrial feeder and sub-feeder applications where fault current is high.
Key ratings and what they mean for fit
The 80 A frame at 40 °C is the baseline; derate to 74 A at 70 °C if the panel runs hot. The interrupting curve drops from 75.6 kA at 240 V to 32 kA at 440 V, then to 7.5 kA at 500 V and 690 V — so at higher line voltages the available fault current the breaker can clear is lower. That matters for selectivity studies: if your transformer secondary delivers 50 kA at 480 V, this breaker's 32 kA at 440 V (interpolated) may not be enough; step up to the 3VA1110 frame. Insulation voltage is rated 800 V, so the breaker is suitable for 690 V systems with margin. Power loss at full load is 19.2 W — plan for heat dissipation in a closed panel, especially if multiple breakers are ganged.