MCCB for 250 A feeder protection
The 800 V rated insulation voltage (Ui) means this breaker is comfortable in 480 V and 600 V class systems, though the interrupting rating at 690 V drops to 6 kA, so it's not the right choice for a 690 V main. The thermal derating is honest: full 250 A from 40 °C through 50 °C, then a steady decline to 213 A at 70 °C. Maximum power loss is 48 W, which matters for enclosure ventilation when several breakers are ganged. This is a straightforward line-protection breaker, not a multifunction power-management device.
The breaker measures 105 mm wide, 181 mm high, and 86 mm deep — a standard 3-pole MCCB footprint that drops into a SENTRON 3VA mounting base or a fixed panel cutout. No DIN-rail mounting on this frame size; it's screw-fixed to the backplate or mounting plate.