What this MCCB delivers in a panel
The Siemens SENTRON 3VA2025-8JQ32-0AA0 is a 3-pole molded case circuit breaker rated 25 A continuous, built for line protection in distribution panels. Its ETU560 electronic trip unit gives you adjustable long-time and short-time delay settings — tr from 0.5 to 25, tsd up to 0.5 s — so you can dial in selectivity with downstream breakers without sacrificing coordination. The 440 kA interrupting rating at 240 V means this thing handles massive fault currents upstream of a main bus; at 690 V it still clears 53 kA, which covers most industrial service entrances. Rated insulation voltage is 800 V, so it's comfortable on 480 V or 600 V class systems with headroom. Front protection is IP40 — fine for a deadfront enclosure, but keep the dust and slurry out of the vents if you're mounting it in a mill MCC.
Breaking capacity — what the numbers mean for your fault duty
The interrupting ratings on this breaker aren't just bragging numbers — they govern whether it survives a bolted fault without venting or welding closed. At 240 V it's rated 440 kA, which is typical for a main on a large transformer secondary. At 415 V and 440 V it holds 330 kA. At 500 V it drops to 220 kA, and at 690 V it's still 53 kA. If your available fault current at the line side exceeds these values, you need a current-limiting upstream device or a higher-rated frame. The 25 A continuous rating is flat across the whole ambient range from 40 °C to 70 °C — no derating needed in a hot panel, which is rare and useful.
Panel fit and integration
Dimensions: 86 mm deep, 105 mm wide, 181 mm tall. The IP40 front protection means enclosed mounting. Communication function is present. Ground fault monitoring uses summation current formation on the L-conductor.
How it compares to the 3VA2125-8KQ42-0AA0
The closest functional sibling in the SENTRON line is the 3VA2125-8KQ42-0AA0. Both are 3-pole, 25 A MCCBs with ETU560 releases. The key difference: the 3VA2125-8KQ42-0AA0 carries a higher interrupting rating — 200 kA at 690 V versus this unit's 53 kA. If your available fault current at 690 V exceeds 53 kA, you need the 2125 frame. Otherwise, the 3VA2025-8JQ32-0AA0 is the same trip unit, same dimensions, same accessory compatibility. No rewiring needed if you swap between them in the same panel — just verify the SCCR on the nameplate matches your system.