The Siemens 3VA2140-8JQ46-0AA0 is a SENTRON molded case circuit breaker (MCCB) rated for 40 A continuous current across a 4-pole configuration. It carries a 440 kA interrupting capacity at 240 V, stepping down to 330 kA at 415 V and 220 kA at 500 V — numbers that tell you this breaker handles high-fault industrial service without cascading upstream. The communication function onboard means it can talk to a PLC or BMS for remote trip indication or load shedding, which saves a panel builder an aux contact block and a separate I/O point.
Ratings and what they mean for fit
The 40 A full-scale rating holds flat across the entire operating temperature range from 40 °C to 70 °C — no derating needed in a warm enclosure. That is unusual for a compact MCCB and simplifies panel thermal calculations. The 800 V rated insulation voltage covers 480 V and 600 V class systems with margin. The 4-pole design handles three-phase plus neutral, common in North American and European distribution panels where you need a switched neutral for service disconnect. Interrupting ratings are given at multiple voltages: 440 kA at 240 V, 330 kA at 415 V and 440 V, 220 kA at 500 V, and 52.5 kA at 690 V. The 690 V figure is the one to check if you are feeding a 600 V class motor control center — it still clears 52.5 kA, which is well above typical available fault current for that voltage class.