Siemens SENTRON 3VA2025-7KQ46-0AA0 — 25 A 4-Pole MCCB with 330 kA Breaking Capacity
The Siemens SENTRON 3VA2025-7KQ46-0AA0 is a 4-pole molded case circuit breaker rated for 25 A continuous current, designed for line protection in industrial distribution panels. Its standout feature is the 330 kA breaking capacity at 240 V AC — that means it can safely interrupt fault currents up to 330 kA without upstream damage, which is critical for high-fault installations like transformer secondaries or large motor control centers. At 415 V and 440 V the interrupting rating is 242 kA, and at 500 V it holds at 187 kA; only at 690 V does it drop to 3 kA, so verify your system voltage against these curves.
Ratings and What They Mean for Fit
The 25 A rating holds flat from 40 °C through 70 °C ambient — no derating needed across the typical panel temperature range. The adjustable thermal-magnetic trip range is 38 A minimum to 300 A maximum, with a full-scale value of 25 A and an initial value of 15 A, giving flexibility for coordinating with downstream breakers. Insulation voltage is rated 800 V, so the breaker is suitable for 480 V and 600 V class systems with margin. Power loss is only 0.5 W maximum, negligible for enclosure thermal calculations.
Panel Integration and Deployment
Mounts on a standard DIN rail or panel-mount base. Dimensions are 86 mm depth, 140 mm width, 181 mm height — fits a standard 4-pole MCCB footprint. The design includes a communication function for remote monitoring or trip indication, and a ground-fault monitoring version using summation current formation on L + N conductor. Operating temperature range is -25 °C to 70 °C; storage from -40 °C to 80 °C. No undervoltage release or voltage trigger is built in, so if you need those, plan for external accessories.