The Siemens SENTRON 3VA2040-7HM32-0AA0 is a 3-pole molded case circuit breaker rated for 40 A continuous current with an adjustable thermal-magnetic trip unit covering 60 A to 480 A (cites:,). Its interrupting capacity peaks at 330 kA at 240 V and holds 242 kA at 415 V and 440 V, dropping to 187 kA at 500 V and 3 kA at 690 V (cites:,). The 40 A rating holds flat across the full ambient range from 40 °C to 70 °C, so no derating curve to manage in a warm enclosure (cites:,).
Line protection with ground-fault summation
This SENTRON MCCB is designated for line protection, not motor or feeder-only duty — the thermal-magnetic trip curve is shaped for cable and busbar protection in distribution panels (cite:). It includes summation-current ground-fault monitoring on the L-conductor, which means it can sense leakage from multiple downstream circuits summed through an external toroid and trip on a configurable threshold (cite:). No undervoltage release or communication function is built in (cites:,).
Panel fit and dimensions
The breaker occupies a 105 mm wide by 181 mm tall by 86 mm deep footprint (cites:,). That 86 mm depth (3.39 in) is shallow enough for most 200 mm deep wall-mount enclosures without crowding the gland plate. Mounting is via the standard SENTRON 3VA DIN-rail adapter or screw-mount kit — the same cutout pattern as the 3VA1 family, so a panel laid out for a 3VA1110-5ED32-0AA0 accepts this unit without rewiring or re-punching the backplate.