What this MCCB delivers for your panel
The Siemens 3VA2225-7HN32-0HH0 is a SENTRON molded case circuit breaker (MCCB) rated for 250 A continuous current at 40 °C, making it the right choice for feeding a main distribution board or a large motor control center where you need one reliable overcurrent protective device upstream. It carries a 3-pole design with an ETU350 electronic trip unit, so you get adjustable long-time, short-time, instantaneous, and ground-fault protection curves — not a fixed thermal-magnetic characteristic. That means you can coordinate selectivity downstream without swapping hardware. Breaking capacity hits 330 kA at 240 V and 242 kA at 415 V, which covers most industrial service-entrance and sub-distribution scenarios where fault current runs high. At 690 V it still clears 6.3 kA, enough for 690 V drives or transformer secondaries. The shunt trip (STL) release lets you remotely trip the breaker via a control signal — essential for emergency-stop circuits or remote shutdown from a PLC. Two auxiliary switches plus a separate trip-alarm switch (HQ) give you status feedback for the SCADA or panel indication. Rated insulation voltage is 800 V, so it's comfortable on 400/480 V systems with headroom. The 48 W maximum power loss at full load is manageable for enclosure thermal design, but worth factoring in if the panel is densely packed.
Temperature derating and real-world current
The 250 A rating holds steady from 40 °C up to 50 °C. Above that, the ETU350 derates linearly: 241 A at 55 °C, 232 A at 60 °C, 222 A at 65 °C, and 213 A at 70 °C. If your panel ambient runs hot, size the breaker for the actual temperature, not the nameplate. Operating range is -25 °C to 70 °C; storage range is -40 °C to 80 °C, so it can sit in an unheated warehouse through winter and still commission fine.
Lifecycle and sourcing reality
For a critical spare, order one now and rack it before the existing breaker ages out. The 20,000 mechanical endurance cycles mean it's built for years of service in a typical industrial panel, but having a spare in the cabinet means no sleep lost if the primary fails.
What's included and what's not
The breaker ships with the ETU350 trip unit installed and the shunt trip (STL) fitted. It also includes the basic switch (order code 3VA2225-7HN32-0AA0) and the integrated auxiliary trip module (3VA9688-0BL30). No undervoltage release, no communication module, and no ground-fault monitoring — those are separate add-ons if your application needs them. The trip indicator and voltage trigger are built in, so you get local visual status and the ability to trigger the breaker from an external voltage signal.
Panel fit and dimensions
At 105 mm wide, 181 mm tall, and 86 mm deep, this MCCB fits standard Siemens 3VA mounting footprints. It mounts directly onto the panel backplate or onto a DIN rail adapter (sold separately). The 86 mm depth includes the handle and terminals, so plan for at least 100 mm clearance behind the door.