What this 40 A MCCB delivers for your panel
The Siemens SENTRON 3VA2140-5KQ46-0AA0 is a 4-pole molded case circuit breaker rated for 40 A continuous current, designed for line protection in distribution panels. Its 187 kA interrupting rating at 240 V gives you headroom on high-fault utility feeds, while the 121 kA at 415 V and 440 V covers most European and Asian industrial supplies. At 500 V it still holds 75.6 kA, and at 690 V the rating drops to 3.7 kA — that last figure is the one to watch if you're feeding a 690 V motor drive. The 800 V rated insulation voltage means it's suitable for 690 V systems with margin.
Breaking capacity and selectivity planning
For a site electrical engineer working on coordination studies: the 3VA2140-5KQ46-0AA0 delivers 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 3.7 kA at 690 V. That 690 V figure is the constraint — if your upstream transformer can push more than 3.7 kA into a 690 V fault, you need a current-limiting upstream breaker or a fused switch ahead of this MCCB. The 40 A frame is thermally rated flat from 40 °C to 70 °C ambient, so no derating curve to calculate for typical panel internal temperatures.
Physical fit and panel integration
Dimensions are 181 mm high, 140 mm wide, 86 mm deep — a standard SENTRON 3VA frame size that mounts on a DIN rail or panel-mount plate. The 86 mm depth means it clears most 200 mm deep enclosures with room for wiring gutters. Four poles in a single compact housing; the width is the key dimension for multi-breaker row spacing in a distribution board.
Ground-fault and communication capability
This MCCB includes a ground-fault monitoring function using summation current formation on the L+N conductor — it detects leakage by comparing phase and neutral currents, not by a separate toroid. Communication function is present, so it can integrate with a building management or power monitoring system. The trip indicator is not fitted on this variant; fault status must be read via the communication interface or a visual inspection of the handle position.