A Fusetron FRS-R-9 fuse is an electrical safety device that is designed to protect electrical circuits from overcurrent conditions. It is a type of fuse that is made by the Fusetron brand and is rated at 9 amps. The fuse is designed to interrupt the flow of electrical current if the current exceeds the rated amp rating of the fuse, thereby preventing damage to the electrical equipment and reducing the risk of fire. The FRS-R-9 fuse is typically used in residential and light commercial electrical systems.