The Siemens SENTRON 3VA1140-6EF36-0BC0 is a 3-pole molded case circuit breaker (MCCB) rated 40 A at 40 °C, designed for line protection. Its interrupting capacity reaches 220 kA at 240 V, 154 kA at 415 V, and 121 kA at 440 V — figures that place it in the high-breaking class for industrial feeder and distribution panels. The breaker includes an undervoltage release (UVR) and two auxiliary switches (HQ type), so it can be wired into safety or remote-trip circuits without an external relay.
Ratings and thermal behaviour
The 40 A rating holds steady from 40 °C to 50 °C, then derates to 39 A at 55 °C and 60 °C, 38 A at 65 °C, and 37 A at 70 °C. That means in a warm panel — say 55 °C ambient — the breaker still handles 39 A continuous without nuisance tripping. Rated insulation voltage is 800 V, and maximum power loss is 13.3 W.
Integration and mounting
Dimensions are 130 mm high, 76.2 mm wide, 70 mm deep — fits standard 3-pole MCCB panel cutouts. Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. The supplied basic switch is 3VA11406EF360AA0. No communication function or ground-fault monitoring is built in, so external modules are needed for those features.