SENTRON 3VA1140-6EF32-0AB0 — 40 A MCCB for Line Protection
The Siemens SENTRON 3VA1140-6EF32-0AB0 is a 3-pole molded case circuit breaker (MCCB) rated 40 A, designed for line protection in distribution panels. It carries a 220 kA breaking capacity at 240 VAC — that is the SCCR headroom for fault clearing at that voltage level, which governs selectivity coordination with downstream breakers. At 415 VAC the interrupting rating is 154 kA, dropping to 121 kA at 440 VAC, and 17 kA at both 500 VAC and 690 VAC. These numbers define the maximum fault current the breaker can safely interrupt at each voltage; for a 480 V panel the relevant figure is the 440 V rating (121 kA), not the 240 V headline.
Thermal Derating and Continuous Current
The breaker carries a full 40 A continuously from 40 °C through 50 °C ambient. At 55 °C it derates to 39 A, holds 39 A at 60 °C, then drops to 38 A at 65 °C and 37 A at 70 °C (–). For a panel with elevated internal temperatures — say, a packed enclosure near the upper ambient limit — the 70 °C figure (37 A) is the one to size against. The overcurrent release is a TM240 thermal-magnetic type, meaning the thermal element tracks ambient; no separate adjustment is needed for the derated values listed.
Panel Integration and Dimensions
The 3VA1140-6EF32-0AB0 measures 130 mm high, 76.2 mm wide, and 70 mm deep. It mounts on a DIN rail in a standard distribution board or MCC bucket. The 3-pole footprint matches the SENTRON 3VA family; if replacing an existing 3VA1110 variant, verify the lug kit and accessory slot compatibility — the auxiliary switch design here is 2 auxiliary switches HP, which occupies the same accessory bay as the 3VA1110 series. Insulation voltage is rated 800 V, which covers 480/600 VAC systems with margin.