The 3VA2040-8KP46-0AA0 is a Siemens SENTRON molded case circuit breaker (MCCB) rated for 40 A continuous at 40 °C, with no derating needed up to 70 °C — the full 40 A holds across the operating range. That makes it a straight drop-in for a 40 A feeder or branch circuit without recalculating ambient temperature margins. The interrupting ratings are the headline: 440 kA at 240 V, 330 kA at 415 V and 440 V, 220 kA at 500 V, and 52.5 kA at 690 V. That lets the specifying engineer coordinate selectively with downstream breakers, which is the main reason to pick this over a cheaper thermal-magnetic MCCB.
Panel integration — dimensions and mounting
Dimensions are 86 mm depth, 140 mm width, 181 mm height. Power loss is 1.2 W maximum — negligible for panel thermal calculations.