What the Ratings Mean for Fit
The 3VA2225-5HL42-0KH0: The 250 A continuous rating holds at 40, 45, and 50 °C ambient — no derating needed up to that point. At 55 °C it derates to 241 A, at 60 °C to 232 A, at 65 °C to 222 A, and at 70 °C to 213 A. If your panel ambient runs above 50 °C, size up or account for the reduced ampacity. The 4-pole configuration means it switches all three phases plus neutral, typical for TN-S or TT systems where the neutral needs overcurrent protection. The unit includes a shunt trip release (STL) and comes fitted with 2 auxiliary switches plus 1 trip alarm switch (HQ) — these are factory-installed, so you don't need to add them in the field.
Integration into the Panel
The breaker measures 181 mm high by 140 mm wide by 86 mm deep — that's 7.13 by 5.51 by 3.39 inches. It's a SENTRON 3VA frame, designed for DIN-rail or screw-mount installation in standard distribution panels. The 86 mm depth is the key dimension for gland-plate clearance and door swing; verify your enclosure depth before committing the BOM line. The shunt trip (STL) allows remote tripping from an emergency-stop circuit or a PLC digital output — useful for safety disconnects or automated shutdown sequences.