SENTRON 3VA1140-3EF36-0JC0 — 40 A MCCB, Line Protection, Active Production
The Siemens SENTRON 3VA1140-3EF36-0JC0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection duty, carrying 40 A continuously at 40 °C ambient with no derating needed up to 50 °C — it holds the full 40 A through that band, then steps down to 39 A at 55 °C and 37 A at 70 °C, which is the operating maximum. Breaking capacity is 75.6 kA at 240 V, dropping to 52.5 kA at 415 V and 32 kA at 440 V — enough for most industrial distribution panels where fault current runs high on the secondary side of a 500 kVA transformer.
The breaker measures 130 mm high, 76.2 mm wide, and 70 mm deep — a standard 3-pole MCCB footprint that fits Siemens SENTRON mounting bases and most 600 V panelboards without re-drilling the backplate. Rated insulation voltage is 800 V, so it is suitable for 480/277 V and 600 V systems with margin; the maximum power loss is 10.8 W, which is modest for a 40 A frame and keeps internal panel temperature rise manageable.