What this MCCB is and what it does
The SENTRON 3VA2325-6HN32-0HH0 is a 3-pole molded case circuit breaker (MCCB) rated for 250 A continuous current across the full ambient range from 40 °C to 70 °C — no derating needed up to that ceiling. It is designed for line protection in distribution panels, meaning its trip curve and interrupting rating are matched to feeder and main breaker duty rather than motor or generator protection. Breaking capacity is the headline here: 242 kA at 240 VAC, 187 kA at 415 V and 440 V, 121 kA at 500 V, and 7.5 kA at 690 V. That 242 kA figure at 240 V is high for a 250 A frame — it means this breaker can be installed at a service entrance or large sub-distribution board with a high available fault current without needing a current-limiting fuse upstream. The 7.5 kA at 690 V is the weak point; if your system runs 690 V with a high SCCR, this breaker alone may not suffice. The auxiliary switch configuration includes 2 auxiliary switches plus 1 trip alarm switch (HQ designation), and a shunt trip (STL) release is fitted. The shunt trip allows remote tripping via a control signal — useful for emergency-stop circuits or remote load shedding. There is no undervoltage release fitted on this variant.
Physical fit and panel integration
Dimensions: 248 mm height, 138 mm width, 110 mm depth. That 138 mm width is the standard 3-pole MCCB footprint for the 3VA2 frame — it occupies three 45 mm-wide module positions on a DIN rail or panel-mount plate. The 110 mm depth includes the rear arc chamber and terminal clearance; verify gland-plate depth if the panel is shallow. Operating temperature range is -25 °C to +70 °C, storage from -40 °C to +80 °C. That covers most indoor and sheltered outdoor enclosures in temperate and industrial climates. Maximum power loss is 37.5 W — factor that into enclosure thermal calculations if the panel is densely packed.