What it is and what it does
The Siemens 3VA2140-7HK46-0AA0 is a SENTRON molded case circuit breaker (MCCB) with a 40 A continuous current rating, four poles, and an ETU340 electronic trip unit. It's designed for line protection in commercial and industrial distribution panels — the kind of main or feeder breaker you spec when you need adjustable overload and short-circuit protection, not just a thermal-magnetic fixed curve. The 330 kA interrupting rating at 240 VAC tells you this breaker can clear a fault at that level without self-destructing. At 415 V it's still rated for 242 kA, and it holds 187 kA at 500 V. Only at 690 V does it drop to 3.7 kA — that's the voltage limit for this frame's arc extinction. For most 480/277 V distribution in North America, the 242 kA at 440 V is the figure that matters for SCCR compliance. Rated insulation voltage is 800 V. The ETU340 electronic trip unit provides adjustable protection curves.
Physical fit and panel integration
Footprint is 140 mm wide, 181 mm tall, 86 mm deep. IP40 on the front face means it's protected against tools and wires >1 mm — fine for indoor panel use, but not for washdown or outdoor exposure without an enclosure. Power loss is 1.6 W maximum at rated load. That's low enough that you don't need to derate adjacent devices in a crowded panel, but it's still real heat — keep ventilation slots clear.
What it doesn't have (and why that's fine)
No undervoltage release, no shunt trip, no communication module, no ground-fault monitoring, no voltage trigger, and no trip indicator. This is a bare-bones line-protection breaker — you add accessories externally if needed. The ETU340 handles the adjustable protection curves; everything else is a field-installable option.