80 A, 4-pole, 52.5 kA — the line-protection MCCB with UVR
The Siemens SENTRON 3VA1080-2ED42-0DC0 is a 4-pole molded case circuit breaker rated for 80 A continuous current (Iu) at 40 °C, with a TM210 thermal-magnetic overcurrent release. It carries a 52.5 kA breaking capacity at 240 V, stepping down to 32 kA at 415 V, 13.6 kA at 440 V, and 7.5 kA at 690 V — so it handles high fault currents on the secondary side of a distribution transformer without cascading upstream. This is the line-protection version (not motor-protection), meaning the TM210 release curve is sized for cable and busbar protection in main or sub-distribution panels. The 800 V rated insulation voltage (Ui) gives headroom for 690 V systems.
Current derating and thermal limits
The 80 A rating holds flat from 40 °C to 50 °C. Above that, derating is gradual: 76.8 A at 55 °C, 75.2 A at 60 °C, 73.6 A at 65 °C, and 72 A at 70 °C. If your panel ambient runs hot — say, a sealed enclosure next to a furnace line — you lose about 10 % of capacity at the top end. The operating range is -25 °C to 70 °C; storage range is -40 °C to 80 °C.
Integrated undervoltage release and auxiliary contacts
The 3VA1080-2ED42-0DC0 ships with an undervoltage release (UVR) fitted — part number 3VA9608-0BB25 for the release assembly. That means it trips automatically when control voltage drops below the dropout threshold, which is standard for emergency-stop circuits or mains-monitoring schemes where you want the breaker open on power loss. It also carries two HQ auxiliary switches for remote status indication.
Physical fit and panel integration
Dimensions are 130 mm height, 101.6 mm width, 70 mm depth. The 101.6 mm width is a standard 4-pole MCCB footprint — it occupies four 25.4 mm module spaces on a DIN rail or panel-mount plate. Front protection is IP40, so it's fine for general-purpose indoor panels but not washdown zones.