The Siemens 3VA2040-8HN46-0AA0 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 in a warm panel. It carries 440 kA interrupting capacity at 240 V AC, stepping down to 330 kA at 415 V and 220 kA at 500 V, with a 52.5 kA floor at 690 V. That's a high-interrupting frame for a 40 A breaker, giving selectivity headroom upstream of a distribution board.
Trip unit and protection profile
The ETU350 electronic trip unit is a line-protection design — it's not a motor-protection or ground-fault variant. No undervoltage release, no voltage trigger, no communication function. The breaker is purely a thermal-magnetic replacement with electronic curve shaping for selectivity coordination on a feeder.
Panel fit and environment
Dimensions are 181 mm high, 140 mm wide, 86 mm deep — a standard 4-pole MCCB footprint for a 160 A frame. Front IP40 means it's fine in a clean indoor enclosure but not washdown-rated. Storage range from -40 °C to 80 °C, operating from -25 °C to 70 °C. Rated insulation voltage is 800 V, so it can sit on a 690 V line without a voltage derating concern.