The 3VA1225-1AA32-0HH0: The 250 A rating holds flat from 40 °C to 50 °C, then derates to 243 A at 55 °C, 237 A at 60 °C, 230 A at 65 °C, and 223 A at 70 °C. For a panel that runs at 55 °C ambient, the usable continuous current is 243 A — not the full 250 A. The shunt trip (STL) release accepts 12–30 V DC or 24 V AC 50/60 Hz, which is the typical trip signal from a safety relay or PLC digital output.
As a switch disconnector in MCCB design, this part isolates and disconnects loads in distribution panels, motor control centers, and industrial switchboards. It provides visible isolation for safe maintenance — no overload or short-circuit protection built in, so it pairs with an upstream protective device.
Integration notes
Dimensions: 105 mm wide, 158 mm high, 70 mm deep. The 70 mm depth is shallower than many MCCB-form disconnectors — relevant for shallow enclosures or retrofit into existing panel layouts. Main circuit connection is via busbar connection with front terminals, typical for panel-mounted distribution. Mechanical service life is 15,000 operating cycles typical. Maximum power loss is 57 W at rated current — account for this in enclosure thermal calculations if the disconnector is enclosed with other heat sources.