What this MCCB brings to a hot, dusty panel
The 3VA2225-7KP32-0DC0 is a SENTRON molded case circuit breaker (MCCB) rated for 250 A continuous current on a 3-pole frame. It carries an ETU850 electronic trip unit, which gives you adjustable long-time, short-time, instantaneous, and ground-fault protection curves — useful when coordinating downstream feeders in a cement plant or any environment where the ambient heat climbs past 50 °C. The breaker is rated for 330 kA at 240 V and 242 kA at 415 V, so it handles high available fault current without upstream fuses. At 690 V it still breaks 6.3 kA, which covers most motor circuits in a 690 V distribution. The thing is built for the heat, not the office: it delivers its full 250 A up to 50 °C, then derates to 200 A at 70 °C. That matters when the breaker lives near a kiln or in a non-conditioned switchroom.
Key ratings and what they mean for fit
The 250 A rated continuous current (Iu) is the maximum the breaker can carry without tripping in free air at 40 °C. That same rating holds at 45 °C and 50 °C — no derating needed in a warm panel. At 55 °C it drops to 238 A, at 60 °C to 225 A, at 65 °C to 213 A, and at 70 °C to 200 A. If your panel ambient runs 60 °C, you need to size the breaker for 225 A or less. The rated insulation voltage is 800 V, so the breaker is suitable for 690 V systems with margin. The ETU850 release provides communication function (likely via a communication module) and an undervoltage release is fitted as standard. Two auxiliary switches (HQ type) are integrated for status feedback to a PLC or DCS. Latching endurance is 20 000 operations — that is the mechanical life for the switching mechanism, not the electrical endurance under load.
Panel integration and dimensions
The breaker measures 105 mm wide, 181 mm high, and 86 mm deep. It mounts on a DIN rail or directly to a backplate via the frame's integral mounting points. The 3-pole design fits standard busbar systems and panel cutouts for SENTRON 3VA frames. The basic switch (the switching mechanism) is order code 3VA2225-7KP32-0AA0, and the integrated auxiliary trip is 3VA9608-0BB25 — these are the internal sub-assemblies, not field-replaceable by the end user.