What it is and what it does
The Siemens 3VA2140-8HN32-0AA0 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. Three-pole construction with an ETU350 electronic trip unit, designed for line protection in distribution panels.
Breaking capacity — what the numbers mean for your panel
This MCCB carries a short-circuit breaking capacity of 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. Those are the maximum fault currents it can safely interrupt at each voltage level — critical for verifying SCCR compliance on the panel nameplate. The 800 V rated insulation voltage gives headroom for 480 V and 600 V class systems.
Panel fit and mounting
Dimensions are 86 mm deep, 105 mm wide, 181 mm tall — a standard MCCB footprint for 3-pole frames in this class. The front face carries IP40 protection, meaning it's protected against tools and small wires entering from the front but not sealed against moisture; install in a dry enclosure or behind a panel door. Power loss is a modest 1.2 W maximum, so heat buildup in a dense cabinet is minimal.