What this MCCB is and where it fits
The Siemens 3VA1140-6EF32-0BA0 is a SENTRON molded case circuit breaker (MCCB) designed for line protection in distribution panels. Its 40 A rating at 40 °C and 220 kA interrupting capacity at 240 V make it a strong candidate for high-fault-current service entrance or sub-feed applications where selectivity with downstream breakers matters. Rated insulation voltage is 800 V, so it handles 480 V and 600 V class systems with margin. The 3-pole construction with undervoltage release (UVR) means it can be wired to drop the load automatically on loss of control power — a common safety requirement for conveyors, pumps, or machine-tool feeds.
Breaking capacity across voltage levels
At 240 V the breaker clears 220 kA — enough for most North American service-entrance panels. At 415 V it still holds 154 kA; at 440 V, 121 kA. Above 500 V the rating drops to 17 kA, so for 690 V systems verify the available fault current stays under that threshold.
Thermal derating and power loss
Full 40 A rating holds through 50 °C ambient. At 55 °C it derates to 39 A, at 70 °C to 37 A. Maximum power loss is 13.3 W — useful to know for enclosure heat-rise calculations when the panel runs multiple breakers near their limits.
Panel fit and environmental limits
Width is 76.2 mm, depth 70 mm, height 130 mm — a standard 3-pole MCCB footprint that drops into most SENTRON or third-party distribution panels without re-drilling. Operating range is -25 °C to 70 °C; storage from -40 °C to 80 °C.