What this MCCB does on the line
The Siemens 3VA2140-6KQ42-0AA0 is a SENTRON molded case circuit breaker (MCCB) sized for line protection in a 4-pole configuration, rated for a continuous current of 40 A across the full ambient range from 40 °C to 70 °C — no derating needed up to that ceiling. 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, which covers most industrial distribution panels where high fault current is a concern. This is a current-production part, so it's still a standard BOM line item, not a scavenger hunt.
The 140 mm width across four poles is standard for a 4-pole MCCB this size — fits the usual DIN-rail or panel-mount footprint in a SENTRON distribution board. The communication function (yes) means it can talk to a higher-level monitoring system, useful for a plant that tracks breaker status or load profiles. Ground-fault monitoring uses summation current formation on L + N, so it catches leakage without a separate GFCI module.