The Siemens 3VA2140-6KQ36-0AA0 is a SENTRON molded case circuit breaker (MCCB) rated for 40 A continuous current across the full ambient range from 40 °C to 70 °C — no derating needed up to that ceiling. It's a 3-pole unit built for line protection, fitted with an ETU860 electronic trip unit that gives you adjustable long-time (tr 0.5–25 s) and short-time delay (tsd up to 0.5 s) plus ground-fault monitoring via summation current formation on the L-conductor. The interrupting ratings climb to 242 kA at 240 V and stay at 187 kA through 440 V, then drop to 121 kA at 500 V and 3.8 kA at 690 V — so on a 480 V delta service you've got serious fault-current headroom.
The 3VA2140-6KQ36-0AA0 measures 105 mm wide, 181 mm tall, and 86 mm deep — that's about 4.1 by 7.1 by 3.4 inches. It mounts on a DIN rail or panel, and with the IP40 front face it's fine inside a typical enclosed panel; keep it out of washdown zones since there's no IP65 sealing on the body. The ETU860 trip unit is adjustable on the front face, so you can set the long-time and short-time delays and the ground-fault parameters without pulling the breaker out of the panel. Communication function is built in, which means it can talk to a higher-level system for monitoring or remote trip indication — useful if you're feeding data back to a PLC or SCADA.