The Siemens SENTRON 3VA2140-8HL42-0AA0 is a 4-pole molded case circuit breaker (MCCB) rated for 40 A continuous current, built around the ETU320 electronic trip unit. It's designed for line protection in distribution panels and switchgear assemblies. The ETU320 trip unit provides adjustable overload and short-circuit protection curves, giving the panel builder flexibility to coordinate with downstream breakers without swapping hardware. Breaking capacity runs from 440 kA at 240 V down to 52.5 kA at 690 V — the 440 kA figure at 240 V covers most North American service-entrance fault levels, while the 330 kA at 415 V handles European industrial mains.
Physical fit and panel integration
Dimensions are 181 mm high, 140 mm wide, and 86 mm deep — a standard SENTRON 3VA2 frame size that mounts on a DIN rail or panel-mount adapter in the switchgear enclosure. IP40 protection on the front face means it's suitable for general indoor panel use where no washdown or dust ingress is expected. Power loss is just 1.2 W at rated load, so thermal derating within a crowded enclosure is minimal.
Electrical ratings and what they mean
Rated insulation voltage is 800 V. Continuous current is flat-rated at 40 A across the entire ambient range from 40 °C to 70 °C — no derating needed as the panel warms up, which simplifies panel design. Operating temperature range spans -25 °C to 70 °C, with storage from -40 °C to 80 °C, covering unheated warehouses and outdoor enclosures in temperate climates.