SENTRON 3VA2140-6HK42-0AA0 — 40 A MCCB with ETU340 trip
The Siemens 3VA2140-6HK42-0AA0 is a SENTRON molded case circuit breaker (MCCB) rated for 40 A continuous current, in a 4-pole configuration. It's built around the ETU340 electronic trip unit, which gives you adjustable overload and short-circuit protection curves — useful for coordinating downstream feeders in a distribution panel without swapping trip packs. Breaking capacity hits 242 kA at 240 V AC, dropping to 187 kA at 415/440 V, 121 kA at 500 V, and 3.7 kA at 690 V. That 242 kA figure at 240 V is the headline number for high-fault service-entrance or sub-distribution boards where the available fault current is serious. The 690 V rating is low — this isn't your motor-circuit breaker for 690 V drives; it's a line-protection device sized for 40 A feeders.
What the ratings mean for your panel
At 86 mm deep, 140 mm wide, and 181 mm tall, this MCCB fits the standard SENTRON 3VA2 footprint. The 140 mm width across 4 poles is typical for this class. Power loss is rated at 1.6 W maximum. That's low enough that derating for adjacent breakers in a multi-pole group is minimal, but if you're packing six of these side-by-side in a 40 °C enclosure, you still want to run a thermal calc. The continuous current holds flat at 40 A from 40 °C up to 70 °C ambient — no derating needed across that range, which is unusual and helpful for hot panels near ovens or drives.