What this MCCB is and what it does
The Siemens 3VA2025-8HN32-0AA0 is a SENTRON 3VA2 molded case circuit breaker (MCCB) rated for 25 A continuous current on a 3-pole configuration. It uses the ETU350 electronic trip unit, which gives you adjustable overload and short-circuit protection curves — not a fixed thermal-magnetic response. The 440 kA interrupting rating at 240 V AC means this breaker can safely clear very high fault currents without rupturing, which is what you need for transformer secondaries or large busway feeds where available fault current is high.
Key ratings and what they mean for your panel
Rated insulation voltage is 800 V, so the breaker is rated for 480/277 V and 600 V systems with margin. The 25 A rating holds flat from 40 °C up to 70 °C ambient — no derating needed in a warm enclosure. Breaking capacity steps down as system voltage rises: 440 kA at 240 V, 330 kA at 415/440 V, 220 kA at 500 V, and 52.5 kA at 690 V. For a 480 V panel, the relevant figure is the 415/440 V column at 330 kA, which covers virtually any North American industrial service. The front face carries IP40 protection — fine for a closed panel, but not for washdown areas.
Physical fit and panel integration
Dimensions are 86 mm deep, 105 mm wide, and 181 mm tall. It mounts on a DIN rail or directly to a panel backplate via the screw terminals. The 3-pole footprint matches the standard SENTRON 3VA2 cutout; if you are swapping from a different MCCB family, check the mounting hole pattern against your existing bus bars. No undervoltage release, no communication module, no ground-fault monitoring on this variant — it is a straight line-protection breaker with the ETU350 trip unit.