The Siemens SENTRON 3VA2140-8KQ36-0AA0 is a 3-pole molded case circuit breaker rated for 40 A continuous current, with an adjustable thermal-magnetic trip range from 60 A minimum to 480 A maximum. Breaking capacity runs 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 — numbers that tell you this breaker handles high-fault panels without cascading upstream.
A communication function is onboard, so it can talk to a higher-level system for metering or status — useful for a panel that needs remote trip indication or load monitoring. Max power loss is 1.2 W, which keeps heat inside a crowded enclosure manageable.