What it is and what the ratings mean
The Siemens SENTRON 3VA1080-3ED42-0DA0 is a 4-pole molded case circuit breaker (MCCB) rated for 80 A continuous current (Iu) at up to 50 °C ambient, with a TM210 thermal-magnetic overcurrent release. The 80 A rating holds flat from 40 °C to 50 °C, then derates to 76.8 A at 55 °C, 75.2 A at 60 °C, 73.6 A at 65 °C, and 72 A at 70 °C — so in a warm enclosure you lose about 10 % of the headroom by 70 °C. Breaking capacity is 75.6 kA at 240 V, 52.5 kA at 415 V, 32 kA at 440 V, and 7.5 kA at 690 V; that 75.6 kA at 240 V covers high-fault utility feeds, while the 7.5 kA at 690 V is the limit for 690 V line-side faults. The part is designated for line protection (cable/feeder protection), not motor or generator protection.
Deployment context and panel fit
This MCCB mounts on a DIN rail or directly to a backplate in a panel enclosure. Dimensions are 101.6 mm wide, 130 mm high, and 70 mm deep — the 101.6 mm width is a standard 4-pole MCCB footprint, so it fits existing cutouts or busbar spacing in most distribution boards. Front protection is IP40 (finger-safe, no water ingress), suitable for indoor panel mounting. The part includes an undervoltage release (UVR) as the auxiliary release design; it has no auxiliary contact, no ground fault monitoring, no phase failure detection, and no communication function — it is a pure line protection breaker with a UVR for undervoltage trip.