What this MCCB does and where it fits
The Siemens SENTRON 3VA2225-7HN32-0KH0 is a 3-pole molded case circuit breaker (MCCB) rated for 250 A continuous current, designed for line protection in distribution panels and industrial switchboards. It carries a 330 kA breaking capacity at 240 V AC, dropping to 242 kA at 415 V and 440 V, then to 187 kA at 500 V, and 4.5 kA at 690 V — so the interrupting rating is voltage-dependent and the part is sized for high-fault-capacity main or feeder circuits up to 690 V. The 250 A rating holds from 40 °C up to 50 °C without derating; above that it steps down to 241 A at 55 °C, 232 A at 60 °C, 222 A at 65 °C, and 213 A at 70 °C, which matters for tightly packed enclosures or high-ambient machine bays.
Panel integration and physical fit
Dimensions are 181 mm high, 105 mm wide, and 86 mm deep. The 105 mm width is the standard 3-pole MCCB footprint for this current class — it fits a typical DIN-rail or panel-mount cutout without surprises. The 86 mm depth (3.39 in) leaves clearance for rear-connected busbars or cable lugs in a standard 200 mm deep enclosure. Maximum power loss is 48 W, so thermal planning inside the cabinet should account for that dissipation at full load.
Auxiliary switching and releases
The breaker ships with 2 auxiliary switches plus 1 trip alarm switch (HQ configuration) and a shunt trip release (STL) for remote tripping. There is no undervoltage release on this variant, and no ground-fault monitoring module. The basic switch core is order code 3VA2225-7HN32-0AA0. A voltage trigger and trip indicator are present on the front face for local fault indication.