Medium-duty time delay, loaded link rejection base SL fuse for residential motor circiuts. Use in kitchen, garage, utility room circuits or any circiut that contains electric motors, relays or solenoids. Porcelain threads (Tamper proof base) prevent a larger amp fuse from being used. Extra large clear window makes it easy to see if fuse is blown. 125V AC, 10,000 A.I.C. UL listed.