McMaster-Carr logo
    Filter by
    Overall Length
    Manufacturer Equivalent Fuse
    Overall Diameter
    Cartridge Fuse Type
    U.S.–Mexico–Canada Agreement (USMCA) Qualifying
    Industrial Info Snippet
    DFARS Specialty Metals
    Export Control Classification Number (ECCN)
    Industrial Info Snippet
    Enter e-mail addresses in the fields below
    Message
    Cancel
    Comments
    E-mail address (if you would like a response)
    19 Products
    About Fuses
    industrial info icon

    Decipher key specs from your fuse’s label and cross-reference manufacturer part numbers to find a suitable replacement.

    UL Class RK1 Fast-Acting Fuses

    Image of Product. Front orientation. Fuses. UL Class RK1 Fast-Acting Fuses , Ferrule Cartridge Fuse.
    Image of Product. Front orientation. Fuses. UL Class RK1 Fast-Acting Fuses , Knife-Blade Cartridge Fuse.

    Ferrule

    Cartridge Fuse

    Knife-Blade Cartridge

    Fuse

    These fuses open circuits quickly when surges are detected. They have a rejection-style end design that safeguards against replacement errors. Use with Fuse Blocks for UL Class RK1 Fuses.
    Breakthrough Current @ Voltage—Breakthrough current at voltage, labeled on the fuse as IR, is the maximum current that a fuse can safely stop in the event of a short circuit.
    Each
    Current,
    amp
    Fuse UL
    Class
    Voltage
    Breakthrough Current @ Voltage
    Overall
    Lg.
    No. of
    Elements
    Cartridge
    Fuse Type
    Fuse Protection
    Type
    With Blown Fuse
    Indicator
    Rejection-Style
    End
    Certification
    1-9
    10-Up
    Manufacturer Equivalent Fuse: A6K-R, KLS-R, KTS-R
     
    13/16" Overall Diameter
    1RK1600V AC, 250V DC200,000 amp @ 600V AC
    20,000 amp @ 250V DC
    5"1FerruleFast ActingNoYesUL Listed, CSA Certified
    6616K111000000000000
    2RK1600V AC, 250V DC200,000 amp @ 600V AC
    20,000 amp @ 250V DC
    5"1FerruleFast ActingNoYesUL Listed, CSA Certified
    6616K1120000000000
    3RK1600V AC, 250V DC200,000 amp @ 600V AC
    20,000 amp @ 250V DC
    5"1FerruleFast ActingNoYesUL Listed, CSA Certified
    6616K1130000000000
    4RK1600V AC, 250V DC200,000 amp @ 600V AC
    20,000 amp @ 250V DC
    5"1FerruleFast ActingNoYesUL Listed, CSA Certified
    6616K1140000000000
    5RK1600V AC, 250V DC200,000 amp @ 600V AC
    20,000 amp @ 250V DC
    5"1FerruleFast ActingNoYesUL Listed, CSA Certified
    6616K1150000000000
    6RK1600V AC, 250V DC200,000 amp @ 600V AC
    20,000 amp @ 250V DC
    5"1FerruleFast ActingNoYesUL Listed, CSA Certified
    6616K1160000000000
    8RK1600V AC, 250V DC200,000 amp @ 600V AC
    20,000 amp @ 250V DC
    5"1FerruleFast ActingNoYesUL Listed, CSA Certified
    6616K1170000000000
    10RK1600V AC, 250V DC200,000 amp @ 600V AC
    20,000 amp @ 250V DC
    5"1FerruleFast ActingNoYesUL Listed, CSA Certified
    6616K1180000000000
    12RK1600V AC, 250V DC200,000 amp @ 600V AC
    20,000 amp @ 250V DC
    5"1FerruleFast ActingNoYesUL Listed, CSA Certified
    6616K2110000000000
    15RK1600V AC, 250V DC200,000 amp @ 600V AC
    20,000 amp @ 250V DC
    5"1FerruleFast ActingNoYesUL Listed, CSA Certified
    6616K2120000000000
    20RK1600V AC, 250V DC200,000 amp @ 600V AC
    20,000 amp @ 250V DC
    5"1FerruleFast ActingNoYesUL Listed, CSA Certified
    6616K2130000000000
    25RK1600V AC, 250V DC200,000 amp @ 600V AC
    20,000 amp @ 250V DC
    5"1FerruleFast ActingNoYesUL Listed, CSA Certified
    6616K2140000000000
    30RK1600V AC, 250V DC200,000 amp @ 600V AC
    20,000 amp @ 250V DC
    5"1FerruleFast ActingNoYesUL Listed, CSA Certified
    6616K2150000000000
     
    1 1/16" Overall Diameter
    40RK1600V AC, 300V DC200,000 amp @ 600V AC
    20,000 amp @ 300V DC
    5 1/2"1FerruleFast ActingNoYesUL Listed, CSA Certified
    6616K3310000000000
    50RK1600V AC, 300V DC200,000 amp @ 600V AC
    20,000 amp @ 300V DC
    5 1/2"1FerruleFast ActingNoYesUL Listed, CSA Certified
    6616K3320000000000
    60RK1600V AC, 300V DC200,000 amp @ 600V AC
    20,000 amp @ 300V DC
    5 1/2"1FerruleFast ActingNoYesUL Listed, CSA Certified
    6616K3330000000000
     
    1 5/16" Overall Diameter
    80RK1600V AC, 300V DC200,000 amp @ 600V AC
    20,000 amp @ 300V DC
    7 7/8"1Knife BladeFast ActingNoYesUL Listed, CSA Certified
    6616K341000000000000
    90RK1600V AC, 300V DC200,000 amp @ 600V AC
    20,000 amp @ 300V DC
    7 7/8"1Knife BladeFast ActingNoYesUL Listed, CSA Certified
    6616K342000000000000
    100RK1600V AC, 300V DC200,000 amp @ 600V AC
    20,000 amp @ 300V DC
    7 7/8"1Knife BladeFast ActingNoYesUL Listed, CSA Certified
    6616K343000000000000
     
    back to top