What this MCCB carries — and where it fits
The Siemens 3VA2025-8HM36-0AA0 is a SENTRON 3VA2 molded case circuit breaker configured for line protection, with three poles rated at a continuous 25 A and an ETU330 electronic trip unit. The 25 A rating holds flat from 40 °C all the way to 70 °C — no derating curve to chase across the panel ambient range. Breaking capacity runs from 440 kA at 240 V through 330 kA at 415/440 V, 220 kA at 500 V, and 52.5 kA at 690 V, so it handles high-fault utility feeds and transformer secondaries without cascading upstream. The ETU330 is a basic electronic trip unit — no communication module, no voltage trigger, no undervoltage release on this variant. Ground-fault monitoring uses summation current formation on the L-conductor, so it picks up residual current without a separate GFCI module. The front carries IP40 protection, meaning it's splash-resistant in a closed panel but not washdown-rated.
Footprint and panel fit
At 86 mm deep, 105 mm wide, and 181 mm tall, this 3-pole MCCB fits the standard SENTRON 3VA2 mounting footprint. The depth is the dimension that catches panel builders — 86 mm means it clears most 200 mm deep enclosures with room for rear busbars or wiring ducts. The optional motor drive (product extension available) adds length but stays within the same mounting hole pattern.