Allen-Bradley 1771-FD Fuse

The Allen-Bradley 1771-FD fuse kit is a replacement fuse assembly designed to accompany the 1771-WHF fused field wiring arm in Rockwell Automation’s 1771 I/O family. It provides replaceable fuses and fuse holders that protect the 1771-WHF field wiring arm and the attached I/O modules from overcurrent events, enabling safe maintenance and quick fuse replacement in the field. The kit is intended to be used with the 1771-WHF Field Wiring Arm and uses 2AG cartridge fuses. Documented variants exist within the 1771-FD family; notably, the 1771-FD2 is specified as including two fuse holders and eight 2AG fuses, while manuals for the 1771-WHF configuration reference a 3 A fuse from the Fuse Pak as the standard protection in this setup. As a piece of the AB 1771 system, the 1771-FD kit addresses field-side protection in legacy PLC-5-era I/O installations, offering a targeted replace-and-protect solution for 1771-WHF wiring harnesses in industrial control panels.