What the interrupting ratings mean for your panel
The Siemens 3VA2140-5JQ32-0AA0 is a 3-pole SENTRON molded case circuit breaker rated for 40 A continuous current across the full ambient range from 40 °C to 70 °C — no derating needed up to that ceiling. Its interrupting capacity hits 187 kA at 240 V, dropping to 121 kA at 415 V and 440 V, then 75.6 kA at 500 V, and 3.7 kA at 690 V. That 187 kA figure at 240 V means it can clear a fault upstream of a high-capacity transformer or bus without cascading — critical for selective coordination in a main or feeder position.
Integration and panel fit
Mounts on a DIN rail or panel-mount base in a standard enclosure. Dimensions are 105 mm wide, 181 mm tall, and 86 mm deep — fits the 3VA2 family footprint. The front face carries an IP40 protection class, suitable for dry indoor panels where tools or fingers might contact the front but not the terminals.
Key features for line protection
Equipped with an ETU560 electronic trip unit, configurable for line protection. Includes a ground-fault monitoring function using summation current formation on the L-conductor. Communication function is built in, and a motor drive option is available for remote operation. Rated insulation voltage is 800 V. Maximum power loss is 1.6 W.