The Siemens SENTRON 3VA2040-6HN32-0AA0 is a 3-pole molded case circuit breaker (MCCB) rated for 40 A continuous current, fitted with an ETU350 electronic trip unit. Its interrupting capacity hits 242 kA at 240 V, 187 kA at 415 V, and 121 kA at 500 V — numbers that put it in the high-fault tier for line protection in industrial switchgear. The 40 A rating holds flat across the full ambient range from 40 °C to 70 °C, so no derating curve to chase when the panel runs hot.
Integration and mounting
Dimensions: 105 mm wide, 181 mm tall, 86 mm deep. That 86 mm depth is the body-only figure — factor in the handle throw and rear arc chamber clearance when laying out the gland plate. IP40 on the front face means it's protected against tools and wires but not washdown; keep it inside the enclosure. Three-pole construction, line-protection design with no undervoltage release, no ground-fault monitoring, and no communication module. Straightforward install — line in, load out, no aux wiring to pull.
Trip unit and selectivity
The ETU350 is an electronic trip unit with adjustable long-time, short-time, instantaneous, and ground-fault (when fitted) protection curves. For a 40 A frame, that means you can dial in selective coordination downstream without swapping the breaker body. Rated insulation voltage is 800 V, so it's comfortable on 480 V and 600 V class systems. Power loss maxes at 2.2 W — negligible for panel thermal budgeting, but worth noting if you're packing a dozen of these in a sealed enclosure.