The Siemens SENTRON 3VA2140-6JQ42-0AA0 is a 4-pole molded case circuit breaker (MCCB) rated for 40 A continuous current and designed for line protection. Its interrupting capacity hits 242 kA at 240 V, dropping to 187 kA at 415 V and 440 V, then 121 kA at 500 V, and 3.7 kA at 690 V — so at typical 400 V distribution it clears faults up to 187 kA without cascading upstream breakers. The insulation voltage is rated 800 V, meaning it can sit on a 690 V bus with margin.
Thermal performance and ambient derating
The breaker holds its full 40 A rating from 40 °C through 70 °C ambient — no derating curve to chase across the panel temperature range. That flat thermal profile simplifies panel sizing when the MCCB sits near transformers or drives that push enclosure temperature.
Ground-fault and communication
This variant includes ground-fault monitoring via summation current formation on L + N conductors, and a communication function for integration into a monitoring or energy-management system. The power loss is 1.6 W maximum — negligible for thermal budgeting in a crowded panel.