MCCB for high-fault panel builds
The Siemens 3VA2225-5HN32-0AG0 is a 3-pole molded case circuit breaker from the SENTRON family, rated for 250 A continuous current (Iu) and carrying a 187 kA breaking capacity at 240 V — that's the short-circuit rating that governs whether this breaker clears a fault without upstream devices needing to coordinate. The ETU350 electronic trip unit gives you adjustable overload and short-circuit protection curves, which matters when you're feeding a motor control center or a distribution sub-panel where the load profile isn't purely resistive.
Breaking capacity across voltage levels
The interrupting rating drops as voltage rises: 187 kA at 240 V, 121 kA at both 415 V and 440 V, 79 kA at 500 V, and 5.1 kA at 690 V. That 5.1 kA figure at 690 V is the one to watch if you're feeding a 690 V drive or transformer — it's still adequate for most secondary distribution, but you'd want to verify the available fault current at that voltage before committing the BOM line.
Thermal derating and panel fill
At 40 °C through 50 °C it holds the full 250 A rating. Above that it derates: 241 A at 55 °C, 232 A at 60 °C, 222 A at 65 °C, 213 A at 70 °C. The dimensions — 86 mm deep, 105 mm wide, 181 mm tall — fit a standard MCCB footprint, and the IP40 front protection means it's suited for enclosed panel mounting where the front face is behind a door. The 48 W maximum power loss at full load needs to be factored into the panel's thermal budget, especially in a densely packed enclosure.
Trip unit and auxiliary contacts
The ETU350 electronic trip unit provides adjustable overload and short-circuit protection. The breaker ships with 1 auxiliary switch and 1 trip alarm switch (HP version) — that's the contact configuration you'll use for remote status indication to a PLC or SCADA. No undervoltage release, no ground fault monitoring, no communication module on this variant. The trip indicator is present, which helps during troubleshooting — you can visually confirm the breaker tripped on fault rather than being manually opened.