What this MCCB does and where it fits
The Siemens SENTRON 3VA2140-7KP46-0AA0 is a 4-pole molded case circuit breaker rated for 40 A continuous current with an ETU850 electronic overcurrent release. It is designed for line protection in distribution panels and switchboards, handling fault currents up to 330 kA at 240 V and 242 kA at 415 V — enough to clear high-fault scenarios without upstream coordination issues. The 4-pole configuration covers three-phase plus neutral, common in North American and European industrial feeds where a switched neutral is required.
Breaking capacity and thermal performance
The interrupting ratings are voltage-dependent: 330 kA at 240 V, 242 kA at 415 V and 440 V, 187 kA at 500 V, and 3.7 kA at 690 V. That steep drop at 690 V means this breaker is sized for 480 V / 600 V class systems, not 690 V motor circuits. The continuous current holds flat at 40 A across the full ambient range from 40 °C to 70 °C — no derating needed in a warm enclosure. Power loss is 1.6 W maximum, negligible for panel thermal budgeting.
Panel fit and environmental limits
Dimensions are 140 mm wide, 181 mm high, 86 mm deep — a standard SENTRON 3VA frame that mounts on a DIN rail or panel-mount adapter. Front protection is IP40, suitable for dry indoor enclosures. Operating range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. The ETU850 release supports communication functions for remote monitoring or trip-data retrieval.