Motor protection MCCB with 250 A continuous rating and 330 kA interrupting capacity
Its breaking capacity reaches 330 kA at 240 V AC, 242 kA at 415/440 V, 187 kA at 500 V, and 52.5 kA at 690 V — figures that place it in the high-interrupting class for industrial feeder and motor branch circuits. This version ships with an ETU350M electronic trip unit (overcurrent release) and an integrated shunt trip (STL) auxiliary release. Rated current holds at 250 A from 40 °C through 50 °C, then derates to 240 A at 55 °C, 235 A at 60 °C, 230 A at 65 °C, and 225 A at 70 °C. Mechanical endurance is 15,000 cycles. Maximum power loss is 37.5 W.
The 138 mm width is three pole spaces at 46 mm per pole — standard for this class of MCCB. Verify gland plate clearance for the 110 mm depth plus wiring bend radius when laying out the enclosure.