What this 250 A MCCB delivers
The Siemens 3VA2225-7HN32-0DH0 is a SENTRON molded case circuit breaker rated for 250 A continuous current (Iu) across a 3-pole configuration. The ETU350 electronic trip unit provides line protection with adjustable settings, and the breaker carries a rated insulation voltage (Ui) of 800 V. Breaking capacity reaches 330 kA at 240 V, 242 kA at 415 V and 440 V, 187 kA at 500 V, and 6.3 kA at 690 V — the 690 V figure is the ceiling for this frame, so verify your system voltage against that curve.
Thermal derating and panel fit
At 40 °C, 45 °C, and 50 °C the breaker holds its full 250 A rating. Derating begins at 55 °C (241 A), dropping to 232 A at 60 °C, 222 A at 65 °C, and 213 A at 70 °C. Maximum power loss is 50.5 W — account for that heat in your enclosure sizing. Dimensions are 181 mm height, 105 mm width, 86 mm depth. The 105 mm width is standard for this frame class; confirm your DIN-rail or mounting-plate spacing against that dimension.
Auxiliary and undervoltage release
This variant includes an undervoltage release (UVR) as the auxiliary release type, plus 2 auxiliary switches and 1 trip alarm switch (HQ configuration). The integrated auxiliary trip order code is 3VA9608-0BB25; the basic switch assembly is 3VA2225-7HN32-0AA0. Mechanical endurance is rated at 20 000 operations — suitable for switching duty in distribution panels where the breaker sees regular manual or remote opening.