What this MCCB is and where it fits
The Siemens SENTRON 3VA2140-6KQ46-0AA0 is a 4-pole molded case circuit breaker (MCCB) rated for 40 A continuous current, designed for line protection in industrial distribution panels. Its 242 kA interrupting capacity at 240 V gives you headroom for high-fault installations like transformer secondaries or large motor control centers — that rating means it clears a bolted fault without upstream fuses blowing, keeping selectivity in the panel.
Breaking capacity across voltages — what the numbers mean
This breaker delivers 242 kA at 240 V, 187 kA at both 415 V and 440 V, 121 kA at 500 V, and 3.7 kA at 690 V. The steep drop at 690 V is typical for a 40 A frame — the arc extinction limits the interrupting capability at higher voltages. For a 690 V line, you need to verify the available fault current stays under 3.7 kA, or step up to a higher-rated frame.
Ground-fault and communication built in
The 3VA2140-6KQ46-0AA0 includes ground-fault monitoring via summation current formation on L + N conductors — it detects leakage by comparing the vector sum of phase and neutral currents, so it catches ground faults without a separate GFCI module. It also has a communication function, which means it can report status and trip events over a bus, saving a trip to the panel for diagnostics.