The 14QBP20CFB is a 20-amp, 250-volt, fast-blow ceramic fuse commonly used in microwave ovens to protect against electrical surges and faults. Measuring 1.25 inches (31.75 mm) in length and 0.25 inches (6.35 mm) in diameter, it is designed to fit standard microwave fuse holders. 

Installation Instructions:

Safety First: Unplug the microwave and allow it to discharge for several minutes to ensure safety.

Access the Fuse: Remove the microwave's outer cover, typically secured by screws, to locate the fuse holder.

Remove the Old Fuse: Carefully extract the blown fuse from its holder using insulated tools.

Install the New Fuse: Insert the 14QBP20CFB fuse into the holder, ensuring a secure fit.

Reassemble and Test: Replace the microwave's cover, secure it with screws, and plug the appliance back in. Test the microwave to confirm proper operation.

Note: If the new fuse blows shortly after installation, there may be an underlying electrical issue requiring professional inspection.

Ensure the replacement fuse matches the original specifications to maintain safety and functionality.