Fusible and Non-Fusible Disconnect Switches

What Is a Disconnect Switch

A disconnect switch is a manually operated device that completely isolates electrical equipment from its power source, letting you de-energize a circuit safely for maintenance, inspection, repair, or emergency shutdown. It creates a visible, verifiable break in the circuit. Unlike electronic switching, the physical separation of contacts confirms that no current can reach downstream equipment. The National Electrical Code requires disconnect switches for motor-driven equipment, and they must be installed within sight of the equipment they isolate.

Wistex supplies disconnect switches built to meet OSHA lock-out/tag-out requirements while providing safe, reliable isolation for industrial equipment. Choose from fusible, non-fusible, and motor disconnect options up to 2000 A, all available in NEMA 4X and NEMA 12 enclosures for harsh or dusty environments. With rapid shipping and expert guidance, Wistex ensures you get the right switch for the job. Need overcurrent protection? Pair your switch with one of our circuit breakers.

  • ASD25DCH4FVD1600 Noark 1500V DC Disconnect Switch, UL489B, 150kA, 4P, Fixed, Vertical, D type connection, 1600A
    Noark

    ASD25DCH4FVD1600

    1500V DC Disconnect Switch, UL489B, 150kA, 4P, Fixed, Vertical, D type connection, 1600A

    $12,303.15
    $13,670.17
  • ASD25DCH4FVD2000 Noark 1500V DC Disconnect Switch, UL489B, 150kA, 4P, Fixed, Vertical, D type connection, 2000A
    Noark

    ASD25DCH4FVD2000

    1500V DC Disconnect Switch, UL489B, 150kA, 4P, Fixed, Vertical, D type connection, 2000A

    $12,879.49
    $14,310.54
  • ASD25DCH4FVD2500 Noark 1500V DC Disconnect Switch, UL489B, 150kA, 4P, Fixed, Vertical, D type connection, 2500A
    Noark

    ASD25DCH4FVD2500

    1500V DC Disconnect Switch, UL489B, 150kA, 4P, Fixed, Vertical, D type connection, 2500A

    $13,455.82
    $14,950.91
  • ASD25DCH4FVD800 Noark 1500V DC Disconnect Switch, UL489B, 150kA, 4P, Fixed, Vertical, D type connection, 800A
    Noark

    ASD25DCH4FVD800

    1500V DC Disconnect Switch, UL489B, 150kA, 4P, Fixed, Vertical, D type connection, 800A

    $11,735.81
    $13,039.79
  • ASD25H3DH1200 Noark UL Air disconnect switch, 2500A Frame, ASD25H, 3P, Withdrawable type, Horizontal connection, 1200A
    Noark

    ASD25H3DH1200

    UL Air disconnect switch, 2500A Frame, ASD25H, 3P, Withdrawable type, Horizontal connection, 1200A

    $12,207.91
    $13,564.34
  • ASD25H3DH1600 Noark UL Air disconnect switch, 2500A Frame, ASD25H, 3P, Withdrawable type, Horizontal connection, 1600A
    Noark

    ASD25H3DH1600

    UL Air disconnect switch, 2500A Frame, ASD25H, 3P, Withdrawable type, Horizontal connection, 1600A

    $12,821.36
    $14,245.96
  • ASD25H3DH2000 Noark UL Air disconnect switch, 2500A Frame, ASD25H, 3P, Withdrawable type, Horizontal connection, 2000A
    Noark

    ASD25H3DH2000

    UL Air disconnect switch, 2500A Frame, ASD25H, 3P, Withdrawable type, Horizontal connection, 2000A

    $13,461.12
    $14,956.80
  • ASD25H3DH600 Noark UL Air disconnect switch, 2500A Frame, ASD25H, 3P, Withdrawable type, Horizontal connection, 600A
    Noark

    ASD25H3DH600

    UL Air disconnect switch, 2500A Frame, ASD25H, 3P, Withdrawable type, Horizontal connection, 600A

    $11,051.09
    $12,278.99
  • ASD25H3DH800 Noark UL Air disconnect switch, 2500A Frame, ASD25H, 3P, Withdrawable type, Horizontal connection, 800A
    Noark

    ASD25H3DH800

    UL Air disconnect switch, 2500A Frame, ASD25H, 3P, Withdrawable type, Horizontal connection, 800A

    $11,629.49
    $12,921.66
  • ASD25H3DV1200 Noark UL Air disconnect switch, 2500A Frame, ASD25H, 3P, Withdrawable type, Vertical connection, 1200A
    Noark

    ASD25H3DV1200

    UL Air disconnect switch, 2500A Frame, ASD25H, 3P, Withdrawable type, Vertical connection, 1200A

    $12,821.36
    $14,245.96
  • ASD25H3DV1600 Noark UL Air disconnect switch, 2500A Frame, ASD25H, 3P, Withdrawable type, Vertical connection, 1600A
    Noark

    ASD25H3DV1600

    UL Air disconnect switch, 2500A Frame, ASD25H, 3P, Withdrawable type, Vertical connection, 1600A

    $12,821.36
    $14,245.96
  • ASD25H3DV2000 Noark UL Air disconnect switch, 2500A Frame, ASD25H, 3P, Withdrawable type, Vertical connection, 2000A
    Noark

    ASD25H3DV2000

    UL Air disconnect switch, 2500A Frame, ASD25H, 3P, Withdrawable type, Vertical connection, 2000A

    $13,461.12
    $14,956.80
  • ASD25H3DV600 Noark UL Air disconnect switch, 2500A Frame, ASD25H, 3P, Withdrawable type, Vertical connection, 600A
    Noark

    ASD25H3DV600

    UL Air disconnect switch, 2500A Frame, ASD25H, 3P, Withdrawable type, Vertical connection, 600A

    $11,051.09
    $12,278.99
  • ASD25H3DV800 Noark UL Air disconnect switch, 2500A Frame, ASD25H, 3P, Withdrawable type, Vertical connection, 800A
    Noark

    ASD25H3DV800

    UL Air disconnect switch, 2500A Frame, ASD25H, 3P, Withdrawable type, Vertical connection, 800A

    $11,629.49
    $12,921.66
  • ASD25H3FH1200 Noark UL Air disconnect switch, 2500A Frame, ASD25H, 3P, Fixed type, Horizontal connection, 1200A
    Noark

    ASD25H3FH1200

    UL Air disconnect switch, 2500A Frame, ASD25H, 3P, Fixed type, Horizontal connection, 1200A

    $11,051.09
    $12,278.99
  • ASD25H3FH1600 Noark UL Air disconnect switch, 2500A Frame, ASD25H, 3P, Fixed type, Horizontal connection, 1600A
    Noark

    ASD25H3FH1600

    UL Air disconnect switch, 2500A Frame, ASD25H, 3P, Fixed type, Horizontal connection, 1600A

    $11,603.21
    $12,892.45
  • ASD25H3FH2000 Noark UL Air disconnect switch, 2500A Frame, ASD25H, 3P, Fixed type, Horizontal connection, 2000A
    Noark

    ASD25H3FH2000

    UL Air disconnect switch, 2500A Frame, ASD25H, 3P, Fixed type, Horizontal connection, 2000A

    $12,181.62
    $13,535.13
  • ASD25H3FH600 Noark UL Air disconnect switch, 2500A Frame, ASD25H, 3P, Fixed type, Horizontal connection, 600A
    Noark

    ASD25H3FH600

    UL Air disconnect switch, 2500A Frame, ASD25H, 3P, Fixed type, Horizontal connection, 600A

    $9,999.44
    $11,110.49
  • ASD25H3FH800 Noark UL Air disconnect switch, 2500A Frame, ASD25H, 3P, Fixed type, Horizontal connection, 800A
    Noark

    ASD25H3FH800

    UL Air disconnect switch, 2500A Frame, ASD25H, 3P, Fixed type, Horizontal connection, 800A

    $10,525.27
    $11,694.74
  • ASD25H3FV1200 Noark UL Air disconnect switch, 2500A Frame, ASD25H, 3P, Fixed type, Vertical connection, 1200A
    Noark

    ASD25H3FV1200

    UL Air disconnect switch, 2500A Frame, ASD25H, 3P, Fixed type, Vertical connection, 1200A

    $11,051.09
    $12,278.99
  • ASD25H3FV1600 Noark UL Air disconnect switch, 2500A Frame, ASD25H, 3P, Fixed type, Vertical connection, 1600A
    Noark

    ASD25H3FV1600

    UL Air disconnect switch, 2500A Frame, ASD25H, 3P, Fixed type, Vertical connection, 1600A

    $11,603.21
    $12,892.45
  • ASD25H3FV2000 Noark UL Air disconnect switch, 2500A Frame, ASD25H, 3P, Fixed type, Vertical connection, 2000A
    Noark

    ASD25H3FV2000

    UL Air disconnect switch, 2500A Frame, ASD25H, 3P, Fixed type, Vertical connection, 2000A

    $12,181.62
    $13,535.13
  • ASD25H3FV2500 Noark UL Air disconnect switch, 2500A Frame, ASD25H, 3P, Fixed type, Vertical connection, 2500A
    Noark

    ASD25H3FV2500

    UL Air disconnect switch, 2500A Frame, ASD25H, 3P, Fixed type, Vertical connection, 2500A

    $12,795.08
    $14,216.75
  • ASD25H3FV600 Noark UL Air disconnect switch, 2500A Frame, ASD25H, 3P, Fixed type, Vertical connection, 600A
    Noark

    ASD25H3FV600

    UL Air disconnect switch, 2500A Frame, ASD25H, 3P, Fixed type, Vertical connection, 600A

    $9,999.44
    $11,110.49
  • ASD25H3FV800 Noark UL Air disconnect switch, 2500A Frame, ASD25H, 3P, Fixed type, Vertical connection, 800A
    Noark

    ASD25H3FV800

    UL Air disconnect switch, 2500A Frame, ASD25H, 3P, Fixed type, Vertical connection, 800A

    $10,525.27
    $11,694.74
  • ASD25H4DH1200 Noark UL Air disconnect switch, 2500A Frame, ASD25H, 4P, Withdrawable type, Horizontal connection, 1200A
    Noark

    ASD25H4DH1200

    UL Air disconnect switch, 2500A Frame, ASD25H, 4P, Withdrawable type, Horizontal connection, 1200A

    $17,091.06
    $18,990.07
  • ASD25H4DH1600 Noark UL Air disconnect switch, 2500A Frame, ASD25H, 4P, Withdrawable type, Horizontal connection, 1600A
    Noark

    ASD25H4DH1600

    UL Air disconnect switch, 2500A Frame, ASD25H, 4P, Withdrawable type, Horizontal connection, 1600A

    $17,949.92
    $19,944.35
  • ASD25H4DH2000 Noark UL Air disconnect switch, 2500A Frame, ASD25H, 4P, Withdrawable type, Horizontal connection, 2000A
    Noark

    ASD25H4DH2000

    UL Air disconnect switch, 2500A Frame, ASD25H, 4P, Withdrawable type, Horizontal connection, 2000A

    $18,845.57
    $20,939.52

Fusible vs Non-Fusible Disconnect Switches

Fusible disconnect switches combine circuit isolation with overcurrent protection in a single device. Fuses are built into the switch mechanism, so the switch both isolates the circuit for maintenance and clears short circuits and overloads automatically. Non-fusible disconnect switches provide isolation only and rely on upstream devices, such as circuit breakers or motor starters, for overcurrent protection. A fusible switch is typically specified where short-circuit protection is needed at the point of service, such as at a service entrance or in high fault-current applications. Non-fusible switches are the more economical choice where overcurrent protection is already handled upstream, and are commonly used for motor leads. Wistex fusible switches accept Class J, R, and H fuses.

Disconnect Switches We Offer

Our selection includes trusted brands and enclosure styles to suit virtually any industrial application.

Fusible Safety Switches

Fusible Safety Switches

Fusible disconnects provide short-circuit protection and meet NEC service entrance requirements. Ideal for high SCCR applications, these NF-rated switches accept a variety of fuse classes, including J, R, and H.

Non-Fusible Disconnects

Compact and economical, non-fusible disconnect switches offer a reliable means to manually isolate equipment for maintenance. These are commonly used for motor loads when protection is handled upstream.

Non-Fusible Disconnects
Enclosed Motor Disconnects

Enclosed Motor Disconnects

These all-in-one motor disconnects combine a switch and enclosure, making them ideal for local servicing points on rooftop units, pump panels, or machinery.

Lock-Out/Tag-Out Compliance

Disconnect switches support lock-out/tag-out procedures through padlockable handles that can be secured in the OFF position, preventing accidental re-energisation while maintenance is underway. Clear ON and OFF position indication allows anyone approaching the equipment to confirm its state without opening the enclosure.

Applications for Disconnect Switches

Wistex disconnects are field-proven across a wide range of industrial and commercial systems.

  • HVAC units
  • Machine tools
  • Pump panels
  • Rooftop equipment

Complete your motor control system with contactors and soft starters.

Why Choose Wistex for Safety Disconnects

Wistex is trusted for code-compliant solutions that meet real-world demands. We stock a wide range of fusible and non-fusible disconnect switches, with amperages from 30 A to 2000 A, and enclosure options built for your environment. Our experts can help you build out complete solutions with fuse kits, mounting hardware, and made-in-USA selections, all ready to ship fast.

Disconnect Switch FAQs

Need help choosing or sizing a disconnect switch? Start with these commonly asked questions.

A fusible disconnect switch is typically required when short-circuit protection is needed at the point of service, such as service entrances or fault-current applications. Many local codes also specify fusing for added safety.

To size a switch, multiply your motor's Full Load Amps (FLA) by 115%, consider voltage and phase, and select the correct fuse class. Browse our 30A disconnect switch options or filter by amperage to find your match.

A disconnect switch provides a safe means to isolate power, but unlike a circuit breaker, it does not offer overcurrent protection. Disconnects are ideal for lock-out/tag-out compliance and scheduled maintenance.