Integrator's spec recap
The Siemens SENTRON 3VA1140-5EF32-0CA0 is a 3-pole molded case circuit breaker (MCCB) rated 40 A continuous at 40 °C ambient, with a thermal-magnetic overcurrent release type TM240. Breaking capacity reaches 187 kA at 240 V AC, derating to 121 kA at 415 V and 75.6 kA at 440 V — sufficient for high-fault utility feeds or transformer secondaries where upstream coordination demands full-rated interruption. The unit ships with an undervoltage release (UVR) factory-fitted; no voltage-trip or communication module on this variant.
Breaking capacity and selectivity
At 240 V the 187 kA interrupting rating places this MCCB well above typical panelboard SCCR requirements — it clears faults that would weld a standard 25 kA or 65 kA breaker closed. The 121 kA at 415 V and 75.6 kA at 440 V still cover most industrial 400 V distribution. Below 500 V the curve drops to 17 kA, so confirm the available fault current at the point of installation if running on a 690 V system. The 800 V rated insulation voltage (Ui) supports use in 690 V networks with appropriate derating.
Thermal derating and power loss
Rated 40 A from 40 °C through 50 °C ambient; at 55 °C it derates to 39 A, at 65 °C to 38 A, and at 70 °C to 37 A. Maximum power loss is 13.3 W — relevant for enclosure heat rise calculations when grouping multiple breakers. Operating temperature range is -25 °C to +70 °C; storage range -40 °C to +80 °C. Dimensions: 130 mm height, 76.2 mm width (3 inches), 70 mm depth — fits standard Siemens 3VA panel mounting footprints.