What the ratings mean for fit
The Siemens SENTRON 3VA1080-4ED42-0DH0 is a 4-pole molded case circuit breaker (MCCB) rated 80 A at 40 °C, with a thermal derating curve that holds 80 A up to 50 °C, then drops to 78 A at 55 °C, 77 A at 60 °C, 75 A at 65 °C, and 74 A at 70 °C — so in a warm panel near the top of a 40 °C ambient you still get full rated current, but above 50 °C you lose 2–6 A per step. Interrupting capacity is 121 kA at 240 V, 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at 500 V and 690 V — that 121 kA figure at 240 V means it safely clears a fault on a 240 VAC line even if the available fault current is very high, typical of large transformer-fed panels. Rated insulation voltage is 800 V, so the breaker is rated for use on 480/277 V and 600 V systems with margin to spare.
Panel integration and wiring
The 3VA1080-4ED42-0DH0 measures 101.6 mm wide, 130 mm tall, 70 mm deep — the 101.6 mm width is a standard 4-inch footprint that fits most DIN-rail or panel-mount MCCB cutouts without re-drilling the gland plate. It ships with an undervoltage release (UVR) as the auxiliary release type, plus 2 auxiliary switches and 1 trip alarm switch (HQ) — the UVR drops the breaker on loss of control voltage, which is standard for safety circuits that need a guaranteed disconnect if the control supply fails. Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C — the storage range is wider because the breaker isn't carrying load current during storage.