RK5 Dual Element Fuses - 250V 50A - RK5 Dual Element Fuses - 250V 50A provides a time delay feature.RK5 Dual Element Fuses - 250V 50A features include:Provides time delay for temporary over current conditions and motor running protection for heating and air conditioning equipmentEliminates unnecessary maintenance from harmless overloadsUL Class RK5, Standard for safety 198E, Current Limiting FusesInterrupting Rating 200,000 Amps. rms. A.C.UL Listed and CSA CertifiedOrder Order Qty of 10 = 1 Box of 10Below is more info on our RK5 Dual Element Fuses - 250V 50A: