The majority of Kaoyi and other manufacturer's Sliding Foot Dimmers operating a 240v halogen bulb are fitted with a safety fuse that can be replaced if the short circuit protection is fused or similar problem occurs. Although a fix, the cause of the problem should be investigated before the installation of a new fuse. The fitting of any other fuse may permanently damage the Sliding Dimmer as well as invalidate any guarantee you may have on your light fitting. The fitting of genuine fuses is paramount to your guarantee.