Siemens SENTRON 3VA1080-2ED42-0AH0 — 80 A 4-Pole MCCB for Line Protection
The Siemens SENTRON 3VA1080-2ED42-0AH0 is a 4-pole molded case circuit breaker (MCCB) rated 80 A, designed for line protection in distribution panels. It carries a 52.5 kA breaking capacity at 240 V, dropping to 32 kA at 415 V and 7.5 kA at 690 V — so it handles high-fault utility feeds in industrial and commercial switchboards. The TM210 thermal-magnetic release gives fixed thermal and magnetic trip settings; no adjustment needed for standard feeder or branch-circuit duty.
Thermal Derating and Breaking Capacity — What the Ratings Mean for Fit
The 80 A rating holds from 40 °C up to 50 °C ambient, then derates to 78 A at 55 °C, 77 A at 60 °C, 75 A at 65 °C, and 74 A at 70 °C. In a warm panel — say 55 °C near the top of a vertical section — you lose 2 A of headroom. The 800 V rated insulation voltage (Ui) means it can be used on 480/277 V or 600 V systems without de-rating the insulation. Breaking capacity steps down with voltage: 52.5 kA at 240 V, 32 kA at 415 V, 13.6 kA at 440 V, and 7.5 kA at both 500 V and 690 V. For a 480 V panel with 25 kA available fault current, this breaker covers it with margin.
Panel Fit and Dimensions
The breaker measures 130 mm high, 101.6 mm wide, and 70 mm deep — a 4-pole footprint that fits standard Siemens 3VA panel mounting. The 70 mm depth leaves clearance for rear-connected busbars or cable lugs in a typical 600 mm deep enclosure.