McMaster-Carr logo
    Forward
    Enter e-mail addresses in the fields below
    Message
    Cancel
    Print
    How can we improve?
    Comments
    E-mail address (if you would like a response)
    49 Products

    Durable Disconnect Switches

    Protected by a steel enclosure, these switches withstand tougher conditions than switches in a plastic housing. Also known as safety switches, they have quick-make/quick-break action to eliminate arcing and prolong switch life. They have a lockout to secure in the off position using a padlock (not included).
    Maintained SwitchAbout Maintained Switch
    Image of Product. Front orientation. Disconnect Switches. Durable Disconnect Switches.
    Fuse Holder—Switches with a fuse holder are used where overload protection is needed. When the current exceeds the fuse’s rating, the fuse will blow, interrupting the circuit to prevent the switch from overheating, breaking, or causing a fire. These switches require rejection-style fuse clips when used with UL Class RK1, RK5, or T fuses. Note: Horsepower ratings are based on time-delay fuses installed.
    Safety Interlock—Switches with safety interlock keep the door closed when the switch is on and prevent the switch from turning on when the door is open.
    Viewing Window—Switches with a viewing window let you see the switch position without opening the enclosure.
    Switches
    Rejection-Style Fuse Clips for
    RK1 and RK5 Fuse Class
    Switching
    Current,
    amp
    Voltage
    Switch
    Designation
    Electrical Phase (hp)
    For No.
    of Wires
    For Fuse UL Class
    Ht.
    Wd.
    For Max. Padlock
    Shackle Dia.
    Wire
    Connection
    Enclosure
    Rating
    Certification
    Specs. Met
    Each
    Each
    Gray Enamel-Coated Steel Housing with Black Actuator
     
    3 Circuits Controlled with Lockout, Safety Interlock, and Fuse Holder
    30600V AC/600V DC3PDT
    		Single (3 hp @ 480V AC)
    Three (5 hp @ 480V AC)
    Three (7 1/2 hp @ 600V AC)    		3RK1, RK5, J, K5, H38 7/16"12"3/8"Tab TerminalNEMA 1
    		UL Listed
    		—1960N1000000000———0
    60600V AC/600V DC3PDT
    		Single (5 hp @ 480V AC)
    Three (15 hp @ 480V AC)
    Three (15 hp @ 600V AC)    		3RK1, RK5, J, K5, H38 7/16"12"3/8"Tab TerminalNEMA 1
    		UL Listed
    		—1960N200000000———0
    100600V AC/600V DC3PDT
    		Single (10 hp @ 480V AC)
    Three (25 hp @ 480V AC)
    Three (30 hp @ 600V AC)    		3RK1, RK5, J, K5, H38 7/16"12"3/8"Tab TerminalNEMA 1
    		UL Listed
    		—1960N300000000———0
     
    Gray Enamel-Coated Steel with Black/Red Actuator
     
    3 Circuits Controlled with Lockout, Safety Interlock, Fuse Holder, and Viewing Window
    30600V AC/600V DC3PST
    		Three (20 hp @ 600V AC)3RK1, RK5, J, K5, H14 5/8"7 9/16"3/8"Tab TerminalNEMA 1
    		UL Listed, CSA Certified
    		Fed. Spec. W-S-8657499K580000007499K111000000
    30600V AC/600V DC3PST
    		Three (20 hp @ 600V AC)4RK1, RK5, J, K5, H14 5/8"7 9/16"3/8"Tab TerminalNEMA 1
    		UL Listed, CSA Certified
    		Fed. Spec. W-S-8657499K730000007499K11100000
    60600V AC/600V DC3PST
    		Three (50 hp @ 600V AC)3RK1, RK5, J, K5, H18 1/8"9"3/8"Tab TerminalNEMA 1
    		UL Listed, CSA Certified
    		—7499K570000007499K11200000
    60600V AC/600V DC3PST
    		Three (50 hp @ 600V AC)4RK1, RK5, J, K5, H18 1/8"9"3/8"Tab TerminalNEMA 1
    		UL Listed, CSA Certified
    		—7499K590000007499K11200000
    100600V AC/600V DC3PST
    		Three (100 hp @ 600V AC)4RK1, RK5, J, K5, H21 7/8"9"3/8"Tab TerminalNEMA 1
    		UL Listed, CSA Certified
    		—7499K670000007499K11300000
    200600V AC/600V DC3PST
    		Three (150 hp @ 600V AC)4RK1, RK5, J, K5, H29"17"3/8"Tab TerminalNEMA 1
    		UL Listed, CSA Certified
    		—7499K69000000007499K11400000
     
    Gray Powder-Coated Steel Housing with Red Actuator
     
    2 Circuits Controlled with Lockout, Safety Interlock, and Fuse Holder
    30240V AC/250V DCDPST
    		Single (3 hp @ 240V AC)
    Three (7 1/2 hp @ 240V AC)    		3RK1, RK5, K5, H14 1/4"6 5/8"5/16"Tab TerminalNEMA 1
    		UL Listed
    		—7524K210000007524K41400000
    100240V AC/250V DCDPST
    		Single (15 hp @ 240V AC)3RK1, RK5, K5, T, H17 1/2"11 3/16"5/16"Tab TerminalNEMA 1
    		UL Listed
    		—7524K230000007524K41300000
     
    2 Circuits Controlled with Lockout and Fuse Holder
    60240V AC/250V DCDPST
    		Single (10 hp @ 240V AC)3RK1, RK5, K5, H10 1/16"6 7/16"5/16"Tab TerminalNEMA 1
    		UL Listed
    		—7524K220000007524K41200000
     
    3 Circuits Controlled with Lockout, Safety Interlock, and Fuse Holder
    30240V AC/250V DC3PST
    		Single (3 hp @ 240V AC)
    Three (7 1/2 hp @ 240V AC)    		3RK1, RK5, K5, H14 1/4"6 5/8"5/16"Tab TerminalNEMA 1
    		UL Listed
    		—7524K110000007524K41400000
    100240V AC/250V DC3PST
    		Single (15 hp @ 240V AC)
    Three (30 hp @ 240V AC)    		4RK1, RK5, K5, T, H23 1/8"11 3/4"5/16"Tab TerminalNEMA 1
    		UL Listed
    		—7524K130000007524K41300000
     
    3 Circuits Controlled with Lockout and Fuse Holder
    60240V AC/250V DC3PST
    		Single (10 hp @ 240V AC)
    Three (15 hp @ 240V AC)    		4RK1, RK5, K5, H10 1/16"6 7/16"5/16"Tab TerminalNEMA 1
    		UL Listed
    		—7524K120000007524K41200000
     
    Fuse Holders
    Each
    Rejection-Style Fuse Clip for T Fuse Class7524K421000000

    Outdoor Durable Disconnect Switches

    All switches have quick-make/quick-break action to eliminate arcing and prolong switch life.
    Maintained SwitchAbout Maintained Switch
    Image of Product. Front orientation. Disconnect Switches. Outdoor Durable Disconnect Switches.
    Enamel-Coated Steel Housing and Powder-Coated Steel Housing—The enclosure is steel, so it withstands tougher conditions than plastic enclosures.
    Fuse Holder—Use switches with a fuse holder where overload protection is needed. When the current exceeds the rating of the fuse, it blows. This interrupts the circuit and prevents overheating, damage, and fire. When used with UL Class RK1, RK5, or T fuses, they require rejection-style fuse clips. Note: Horsepower ratings are based on time-delay fuses installed.
    Safety Interlock—Switches with safety interlock keep the door closed when the switch is on and prevent the switch from turning on when the door is open.
    Viewing Window—Switches with a viewing window let you see the switch position without opening the enclosure.
    Lockout—They have a lockout to secure in the off position using a padlock (not included).
    NEMA 3R Enclosure Rating—A raintight NEMA 3R rated enclosure protects these switches from falling liquids and light splashing.
    Switches
    Rejection-Style Fuse Clips for
    RK1 and RK5 Fuse Class
    Switching
    Current,
    amp
    Voltage
    Switch
    Designation
    Electrical Phase (hp)
    For No.
    of Wires
    For Fuse UL Class
    Ht.
    Wd.
    For Max. Padlock
    Shackle Dia.
    Wire
    Connection
    Enclosure
    Rating
    Certification
    Specs. Met
    Each
    Each
    Gray Enamel-Coated Steel with Black/Red Actuator
     
    3 Circuits Controlled with Lockout, Safety Interlock, Fuse Holder, and Viewing Window
    30600V AC/600V DC3PST
    		Three (20 hp @ 600V AC)3RK1, RK5, J, H15"7 3/4"3/8"Tab TerminalNEMA 3R
    		UL Listed, CSA Certified
    		Fed. Spec. W-S-8657499K7600000007499K111000000
    30600V AC/600V DC3PST
    		Three (20 hp @ 600V AC)4RK1, RK5, J, H15"7 3/4"3/8"Tab TerminalNEMA 3R
    		UL Listed, CSA Certified
    		Fed. Spec. W-S-8657499K930000007499K11100000
    60600V AC/600V DC3PST
    		Three (50 hp @ 600V AC)3RK1, RK5, J, H17 1/2"10 1/2"3/8"Tab TerminalNEMA 3R
    		UL Listed, CSA Certified
    		Fed. Spec. W-S-8657499K680000007499K11200000
    60600V AC/600V DC3PST
    		Three (50 hp @ 600V AC)4RK1, RK5, J, H18 1/2"9 1/16"3/8"Tab TerminalNEMA 3R
    		UL Listed, CSA Certified
    		—7499K740000007499K11200000
    100600V AC/600V DC3PST
    		Three (100 hp @ 600V AC)4RK1, RK5, J, H22 1/8"9 1/16"3/8"Tab TerminalNEMA 3R
    		UL Listed, CSA Certified
    		—7499K75000000007499K11300000
    200600V AC/600V DC3PST
    		Three (150 hp @ 600V AC)4RK1, RK5, J, H29"17"3/8"Tab TerminalNEMA 3R
    		UL Listed, CSA Certified
    		—7499K77000000007499K11400000
     
    Gray Powder-Coated Steel Housing with Red Actuator
     
    2 Circuits Controlled with Lockout, Safety Interlock, and Fuse Holder
    100240V AC/250V DCDPST
    		Single (15 hp @ 240V AC)3RK1, RK5, K5, T, H17 1/2"11 3/16"5/16"Tab TerminalNEMA 3R
    		UL Listed
    		—7524K260000007524K41300000
     
    2 Circuits Controlled with Lockout and Fuse Holder
    30240V AC/250V DCDPST
    		Single (3 hp @ 240V AC)3RK1, RK5, K5, H8 9/16"5 7/16"5/16"Tab TerminalNEMA 3R
    		UL Listed
    		—7524K24000007524K411000000
    60240V AC/250V DCDPST
    		Single (10 hp @ 240V AC)3RK1, RK5, K5, H10 1/16"6 7/16"5/16"Tab TerminalNEMA 3R
    		UL Listed
    		—7524K250000007524K41200000
     
    3 Circuits Controlled with Lockout, Safety Interlock, and Fuse Holder
    100240V AC/250V DC3PST
    		Single (15 hp @ 240V AC)
    Three (30 hp @ 240V AC)    		4RK1, RK5, K5, T, H23 1/8"11 3/4"5/16"Tab TerminalNEMA 3R
    		UL Listed
    		—7524K160000007524K41300000
     
    3 Circuits Controlled with Lockout and Fuse Holder
    30240V AC/250V DC3PST
    		Single (3 hp @ 240V AC)
    Three (7 1/2 hp @ 240V AC)    		4RK1, RK5, K5, H8 9/16"5 7/16"5/16"Tab TerminalNEMA 3R
    		UL Listed
    		—7524K140000007524K411000000
    60240V AC/250V DC3PST
    		Single (10 hp @ 240V AC)
    Three (15 hp @ 240V AC)    		4RK1, RK5, K5, H10 1/16"6 7/16"5/16"Tab TerminalNEMA 3R
    		UL Listed
    		—7524K150000007524K41200000
     
    Fuse Holders
    Each
    Rejection-Style Fuse Clip for T Fuse Class7524K421000000

    Enclosure Disconnect Switches

    Install these switches inside an enclosure to prevent it from opening when power is on—turn the switch to disconnect power and release the door. Cut the shaft to fit the enclosure. Use a padlock (not included) to lock switches in the off position.
    Use additional power poles to control more than three circuits. Add neutral poles to open and close the neutral leg of a three-phase system.
    Switches with Lockout and Fuse Holder
    Image of Product. Front orientation. Contains Annotated. Disconnect Switches. Enclosure Disconnect Switches, Switches with Lockout and Fuse Holder.
    Switches with a fuse holder are used where overload protection is needed. When the current exceeds the fuse's rating, the fuse will blow, interrupting the circuit to prevent the switch from overheating, breaking, or causing a fire.
    Mounting Depth—Mount to DIN rail inside an enclosure; mounting depth is the distance from the panel door to the DIN rail.
    Enclosure Rating—All meet at least one safety standard.
    Switches
    Replacement
    Shafts
    Replacement
    Shaft Bases
    Switching
    Current,
    amp
    Voltage,
    V AC
    Electrical Phase (hp)
    For No.
    of Fuses
    For Fuse
    UL Class
    Ht.
    Wd.
    For DIN
    Rail Ht., mm
    Mounting Dp.
    Enclosure
    Rating
    Each
    Each
    Each
    Gray Plastic Housing with Black Actuator
     
    3 Circuits Controlled—For 1 15/32" Dia. Panel Cutouts
    30600Single (Not Rated)
    Three (7 1/2 hp @ 240V AC)
    Three (20 hp @ 600V AC)    		3J5 11/32"5 7/8"357 7/8" to 20 9/16"IP20
    		7277K30100000007277K2060000007277K207000000
    60600Single (Not Rated)
    Three (15 hp @ 240V AC)
    Three (50 hp @ 600V AC)    		3J5 11/32"5 7/8"357 7/8" to 20 9/16"IP20
    		7277K3030000007277K206000007277K20700000
    100600Single (Not Rated)
    Three (30 hp @ 240V AC)
    Three (75 hp @ 600V AC)    		3J7 5/16"5 15/16"357 7/8" to 20 9/16"IP20
    		7277K3050000007277K206000007277K20700000
     
    Yellow Plastic Housing with Red Actuator
     
    3 Circuits Controlled—For 1 15/32" Dia. Panel Cutouts
    30600Single (Not Rated)
    Three (7 1/2 hp @ 240V AC)
    Three (20 hp @ 600V AC)    		3J5 11/32"5 7/8"357 7/8" to 20 9/16"IP20
    		7277K3020000007277K206000007277K20700000
    60600Single (Not Rated)
    Three (15 hp @ 240V AC)
    Three (50 hp @ 600V AC)    		3J5 11/32"5 7/8"357 7/8" to 20 9/16"IP20
    		7277K3040000007277K206000007277K20700000
    100600Single (Not Rated)
    Three (30 hp @ 240V AC)
    Three (75 hp @ 600V AC)    		3J7 5/16"5 15/16"357 7/8" to 20 9/16"IP20
    		7277K3060000007277K206000007277K20700000
     
    Accessories and Replacements for Disconnect Switches
    Replacement Actuators for Switches with Lockout and Fuse Holder
    Image of Product. Front orientation. Disconnect Switch Actuators. Enclosure Disconnect Switches, Switches with Lockout and Fuse Holder.
    Gray Plastic Housing
    with Black Actuator
    Yellow Plastic Housing
    with Red Actuator
    For Switching
    Current, amp
    Ht.
    Wd.
    Dp.
    Each
    Each
    30, 60, 1006 7/16"3 1/16"1 3/4"7277K2040000007277K205000000
    Auxiliary Contact Blocks for Switches with Lockout and Fuse Holder
    Image of Product. Front orientation. Power Poles. Enclosure Disconnect Switches, Switches with Lockout and Fuse Holder.
    No. of Circuits
    Controlled
    Switching Current @ Voltage
    Switch Starting
    Position
    Switch
    Designation
    Each
    16 amp @ 120V AC, 3 amp @ 240V AC1 Off
    		SPST
    		7277K209000000
    16 amp @ 120V AC, 3 amp @ 240V AC1 On
    		SPST
    		7277K20800000

    Battery Disconnect Switches

    Stop battery drain and prevent the theft or unauthorized use of equipment by disconnecting batteries when not in use.
    Knob Actuator for Top Post Mounting with Fused Bypass
    Image of Product. Front orientation. Disconnect Switches. Battery Disconnect Switches, Knob Actuator for Top Post Mounting with Fused Bypass.
    Knob, key, and T-handle actuators can be removed to limit access to the switch.
    Switches with a fused bypass maintain a trickle of current to accessories, such as radios and computers.
    Max. Continuous Current
    @ Voltage
    For Terminal
    Polarity
    Material
    Lg.
    Wd.
    Ht.
    Each
    125 amp @ 12V DCNegativeBrass3 1/2"1 1/2"1 1/2"7110K41000000
    back to top