MCCB for line protection — 40 A, 3-pole, ETU350 trip unit
The Siemens SENTRON 3VA2140-7HN36-0AA0 is a 3-pole molded case circuit breaker rated for 40 A continuous current, designed for line protection duty in distribution panels and industrial switchboards. Its interrupting capacity reaches 330 kA at 240 V, 242 kA at 415 V and 440 V, 187 kA at 500 V, and 3.7 kA at 690 V — figures that place it in the high-breaking-capacity class, suited for installations with high prospective fault current. The ETU350 electronic trip unit provides adjustable overload and short-circuit protection curves, giving the specifying engineer flexibility to coordinate with downstream breakers.
Panel fit and operating conditions
Dimensions are 105 mm wide, 181 mm high, and 86 mm deep — a standard SENTRON 3VA frame size that drops into existing Siemens switchboard cutouts without panel modification. Rated insulation voltage is 800 V, and the breaker operates from -25 °C to 70 °C ambient, with no derating of the 40 A continuous current across the full temperature range up to 70 °C. Front face carries IP40 protection — suitable for enclosed panel mounting where no water ingress is expected.