What this MCCB carries and where it fits
The Siemens SENTRON 3VA1080-2ED42-0DA0 is a 4-pole molded case circuit breaker (MCCB) rated for 80 A continuous at 40 °C ambient, with a TM210 thermal-magnetic trip unit. It carries a 52.5 kA interrupting capacity at 240 V and 32 kA at 415 V, so it handles high-fault-current service entrance or distribution panels where the available fault current is substantial. The 800 V rated insulation voltage (Ui) tells you it is built for 480Y/277 V and 600 V systems with margin. The TM210 release means the thermal element is fixed at 80 A (the frame rating), and the magnetic pickup is 10x In — 800 A instantaneous. That is a standard motor-and-feeder curve, not a selective (short-time-delay) trip. If you need selectivity downstream, pair it with a 3VA with an electronic release; this one is for straightforward branch or feeder protection where coordination is not the primary concern. An undervoltage release (UVR) is factory-fitted. The breaker trips when control voltage drops below a threshold. The UVR coil draws from the control circuit, not the line side.
Thermal derating and panel space
The 80 A rating holds flat from 40 °C to 50 °C (–). At 55 °C it derates to 78 A, at 60 °C to 77 A, and at 70 °C to 74 A (–). If the breaker lives in a crowded enclosure with other heat sources, use the 70 °C figure for your continuous load calculation — the 6 A drop from nameplate is real. Footprint is 101.6 mm wide by 130 mm tall by 70 mm deep (–). That is a standard 4-pole MCCB width — 4 inches on the dot — so it fits existing SENTRON mounting plates and bus-bar systems without adapters. The 21.7 W max power loss is moderate for an 80 A frame; ensure ventilation slots in the enclosure cover are not blocked.