The Siemens SENTRON 3VA2140-5HK32-0AA0 is a 3-pole molded case circuit breaker (MCCB) rated for 40 A continuous current across the full ambient range from -25 °C to 70 °C — no derating needed up to that limit. Breaking capacity reaches 187 kA at 240 V, 121 kA at 415 V, and 75.6 kA at 500 V — figures that cover most industrial service-entrance and sub-distribution fault levels.
Power loss is listed at 1.6 W maximum, which is low enough that internal cabinet heating from this single breaker is negligible in a ventilated enclosure.
