The Devco ED-CR50 Dual element fuse, 50 Amps, pack of 2 provides time delay for temporary over-current conditions and motor running protection for heating and air conditioning equipment. U.L. Class RK-5, Standard for Safety 198E, Current Limiting Fuses, Interrupting Rating 200,000 Amps. rms. A.C.Eliminates unnecessary maintenance from harmless overloads.