Fusetron dual element time-delay current limiting class RK5 fuse 250 V maximum. Drop-in replacement upgrade for one-time and renewable fuses to aid in locating the open fuse when the power goes out. Time-delay - 10 secs (minimum) at 500% rated current. Indicator on the side turns black when the fuse opens. Fits existing RK1, RK5, K5 H 30 A and 60 A fuse blocks and holders. UL listed.
