Siemens SENTRON 3VA2140-8JP42-0AA0 — 40 A 4-Pole MCCB with ETU550 Trip Unit
The Siemens SENTRON 3VA2140-8JP42-0AA0 is a 4-pole molded case circuit breaker (MCCB) rated for a continuous current Iu of 40 A across the full ambient temperature range from 40 °C to 70 °C — no derating needed up to that ceiling. It carries an ETU550 electronic trip unit, which gives you adjustable long-time pickup and delay settings (tr min. 0.5 s, tr max. 25 s) plus adjustable N-conductor protection (OFF, 40% to 160%). Breaking capacity is 440 kA at 240 V AC, 330 kA at 415 V and 440 V, 220 kA at 500 V, and 53 kA at 690 V — figures that place it in the high-interrupting category for industrial main feeders or large sub-distribution boards where fault current levels are significant. Rated insulation voltage Ui is 800 V, and the front face carries IP40 protection — suitable for installation inside a switchboard enclosure where the front is operator-accessible but the live parts are behind the door.
Integration and Mounting
Dimensions are 181 mm high, 140 mm wide, and 86 mm deep — a 4-pole frame that fits standard Siemens 3VA switchboard mounting patterns. The unit includes communication functionality (yes) and a maximum power loss of 1.2 W, which is negligible for thermal budgeting inside a closed panel. Operating temperature range spans -40 °C to +70 °C, with storage from -40 °C to +80 °C. The ETU550 trip unit is field-adjustable for coordination studies, and the reference code per DIN EN 81346-2 is Q (protective device).