Siemens 3VA1140-3EF32-0KC0 — SENTRON MCCB, 40 A, 3-Pole, Line Protection
The Siemens 3VA1140-3EF32-0KC0 is a SENTRON molded case circuit breaker (MCCB) rated for 40 A continuous current across the 40 to 50 °C ambient range, with a 3-pole construction designed for line protection duty. Breaking capacity reaches 75.6 kA at 240 V, stepping down to 52.5 kA at 415 V, 32 kA at 440 V, and 11.9 kA at both 500 V and 690 V — a curve that tells you this breaker is sized for high-fault commercial and light industrial panels where the available fault current at the secondary of a 480 V transformer can exceed 50 kA.
At 55 °C the continuous rating drops to 39 A; at 65 °C to 38 A; at 70 °C to 37 A. The 10.8 W maximum power loss is manageable but should be factored into the enclosure thermal budget if several breakers are ganged.
Built-in Shunt Trip and Auxiliary Switches
The auxiliary switches are rated for the control circuit voltage; wire them to a digital input module to confirm breaker position without relying on a panel indicator light.