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.

  • 174515 Baco Controls 100A 3P + NC/NO Disc Sw, Din-Rail Mnt, Grey Pad
    Baco Controls

    174515

    100A 3P + NC/NO Disc Sw, Din-Rail Mnt, Grey Pad

    $111.24
    $200.37
  • 174519 Baco Controls 100A 6P Disc Sw, Encl, Grey Pad
    Baco Controls

    174519

    100A 6P Disc Sw, Encl, Grey Pad

    $303.11
    $545.97
  • 174521 Baco Controls 100A 4P (N) Disc Sw, Panel Mnt, Grey Pad
    Baco Controls

    174521

    100A 4P (N) Disc Sw, Panel Mnt, Grey Pad

    $125.83
    $226.64
  • 174522 Baco Controls 100A 4P (N) Disc Sw, Panel Mnt, Grey Non-Pad
    Baco Controls

    174522

    100A 4P (N) Disc Sw, Panel Mnt, Grey Non-Pad

    $128.67
    $231.77
  • 174525 Baco Controls 100A 4P (N) Disc Sw, Din-Rail Mnt, Grey Pad
    Baco Controls

    174525

    100A 4P (N) Disc Sw, Din-Rail Mnt, Grey Pad

    $125.83
    $226.64
  • 174529 Baco Controls 100A 6P + NC/NO Disc Sw, Encl, Grey Pad
    Baco Controls

    174529

    100A 6P + NC/NO Disc Sw, Encl, Grey Pad

    $309.25
    $557.05
  • 174531 Baco Controls 100A 4P (N) + NC/NO Disc Sw, Panel Mnt, Grey Pad
    Baco Controls

    174531

    100A 4P (N) + NC/NO Disc Sw, Panel Mnt, Grey Pad

    $134.79
    $242.79
  • 174532 Baco Controls 100A 4P (N) + NC/NO Disc Sw, Panel Mnt, Grey Non-Pad
    Baco Controls

    174532

    100A 4P (N) + NC/NO Disc Sw, Panel Mnt, Grey Non-Pad

    $137.65
    $247.92
  • 174535 Baco Controls 100A 4P (N) + NC/NO Disc Sw, Din-Rail Mnt, Grey Pad
    Baco Controls

    174535

    100A 4P (N) + NC/NO Disc Sw, Din-Rail Mnt, Grey Pad

    $134.79
    $242.79
  • 174539 Baco Controls 100A 6P + NC/NO Disc Sw, Encl, Grey Pad
    Baco Controls

    174539

    100A 6P + NC/NO Disc Sw, Encl, Grey Pad

    $312.11
    $562.18
  • 174541 Baco Controls 100A 4 Pole Disc Sw, Panel Mnt, Grey Pad
    Baco Controls

    174541

    100A 4 Pole Disc Sw, Panel Mnt, Grey Pad

    $127.70
    $230.01
  • 174542 Baco Controls 100A 4 Pole Disc Sw, Panel Mnt, Grey Non-Pad
    Baco Controls

    174542

    100A 4 Pole Disc Sw, Panel Mnt, Grey Non-Pad

    $130.55
    $235.15
  • 174545 Baco Controls 100A 4 Pole Disc Sw, Din-Rail Mnt, Grey Pad
    Baco Controls

    174545

    100A 4 Pole Disc Sw, Din-Rail Mnt, Grey Pad

    $127.70
    $230.01
  • 174551 Baco Controls 100A 4 Pole + NC/NO Disc Sw, Panel Mnt, Grey Pad
    Baco Controls

    174551

    100A 4 Pole + NC/NO Disc Sw, Panel Mnt, Grey Pad

    $136.70
    $246.22
  • 174552 Baco Controls 100A 4 Pole + NC/NO Disc Sw, Panel Mnt, Grey Non-Pad
    Baco Controls

    174552

    100A 4 Pole + NC/NO Disc Sw, Panel Mnt, Grey Non-Pad

    $139.54
    $251.35
  • 174555 Baco Controls 100A 4 Pole + NC/NO Disc Sw, Din-Rail Mnt, Grey Pad
    Baco Controls

    174555

    100A 4 Pole + NC/NO Disc Sw, Din-Rail Mnt, Grey Pad

    $136.70
    $246.22
  • 174561 Baco Controls 100A 3P Disc Sw, Encl, Grey Pad
    Baco Controls

    174561

    100A 3P Disc Sw, Encl, Grey Pad

    $208.75
    $376.01
  • 174562 Baco Controls 100A 3P Disc Sw, Encl, Grey Pad
    Baco Controls

    174562

    100A 3P Disc Sw, Encl, Grey Pad

    $211.59
    $381.14
  • 174563 Baco Controls 100A 4 Pole Disc Sw, Encl, Grey Pad
    Baco Controls

    174563

    100A 4 Pole Disc Sw, Encl, Grey Pad

    $234.21
    $421.86
  • 174566 Baco Controls 100A 4 Pole Disc Sw, Encl, Grey Non-Pad
    Baco Controls

    174566

    100A 4 Pole Disc Sw, Encl, Grey Non-Pad

    $237.03
    $426.95
  • 174569 Baco Controls Self Adhesive Main Switch Legend
    Baco Controls

    174569

    Self Adhesive Main Switch Legend

    $5.88
    $10.60
  • 174571 Baco Controls 100A 3P + NC/NO Disc Sw, Encl, Grey Pad
    Baco Controls

    174571

    100A 3P + NC/NO Disc Sw, Encl, Grey Pad

    $217.74
    $392.19
  • 174572 Baco Controls 100A 3P + NC/NO Disc Sw, Encl, Grey Pad
    Baco Controls

    174572

    100A 3P + NC/NO Disc Sw, Encl, Grey Pad

    $220.57
    $397.31
  • 174573 Baco Controls 100A 4 Pole + NC/NO Disc Sw, Encl, Grey Pad
    Baco Controls

    174573

    100A 4 Pole + NC/NO Disc Sw, Encl, Grey Pad

    $243.19
    $438.04
  • 174576 Baco Controls 100A 4 Pole + NC/NO Disc Sw, Encl, Grey Non-Pad
    Baco Controls

    174576

    100A 4 Pole + NC/NO Disc Sw, Encl, Grey Non-Pad

    $246.02
    $443.14
  • 174581 Baco Controls 100A 4P (N) Disc Sw, Encl, Grey Pad
    Baco Controls

    174581

    100A 4P (N) Disc Sw, Encl, Grey Pad

    $249.41
    $449.23
  • 174582 Baco Controls 100A 4P (N) Disc Sw, Encl, Grey Pad
    Baco Controls

    174582

    100A 4P (N) Disc Sw, Encl, Grey Pad

    $252.25
    $454.37
  • 174591 Baco Controls 100A 4P (N) + NC/NO Disc Sw, Encl, Grey Pad
    Baco Controls

    174591

    100A 4P (N) + NC/NO Disc Sw, Encl, Grey Pad

    $258.37
    $465.40

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.