170M3744 is a Bussmann (Eaton) high-speed square-body semiconductor fuse rated for 200 A and 1,250 V AC, designed to protect power-electronic loads such as drives, rectifiers, and other power converters. It is an AR-class fuse with a compact square body and an interrupt rating up to 100 kA at the rated voltage, enabling fast fault clearance in high-current, high-voltage systems. Typical uses include protection for AC/DC drives, power converters/rectifiers, and variable-speed drives where rapid interruption of fault currents is required. This device is part of the Bussmann high-speed square-body family and is cataloged by Eaton for industrial power-electronics protection.
