The Limitron KTK-10 is a dual-element fuse with a current rating of 10 amps. It is used to protect electrical circuits from overloading or short-circuiting. The dual-element design allows for both time delay and fast-acting protection. The time-delay feature helps to prevent nuisance tripping, while the fast-acting element quickly responds to dangerous overcurrents. This fuse is typically used in industrial and commercial applications.