Fusetron FRS-R-25 is a type of fuse used in electrical systems. It is a dual-element fuse, which means it has both a time delay and a current-limiting element. The “FRS-R-25” designation indicates that it is a Fusetron fuse with a rating of 25 amps. It is used to protect electrical circuits and equipment from damage due to overcurrent conditions, such as short circuits or ground faults.