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.

  • 0178149LS Baco Controls 32A 4 Pole Disc Sw, Long Shaft Defeatable Door Interlock Handle, Grey Pad
    Baco Controls

    0178149LS

    32A 4 Pole Disc Sw, Long Shaft Defeatable Door Interlock Handle, Grey Pad

    $122.92
    $189.97
  • 0178159LS Baco Controls 32A 4 Pole + NC/NO Disc Sw, Long Shaft Defeatable Door Interlock Handle, Grey Pad
    Baco Controls

    0178159LS

    32A 4 Pole + NC/NO Disc Sw, Long Shaft Defeatable Door Interlock Handle, Grey Pad

    $132.81
    $205.25
  • 0178209LS Baco Controls 50A 3P Disc Sw, Long Shaft Defeatable Door Interlock Handle, Grey Pad
    Baco Controls

    0178209LS

    50A 3P Disc Sw, Long Shaft Defeatable Door Interlock Handle, Grey Pad

    $114.90
    $177.57
  • 0178219LS Baco Controls 50A 3P + NC/NO Disc Sw, Long Shaft Defeatable Door Interlock Handle, Grey Pad
    Baco Controls

    0178219LS

    50A 3P + NC/NO Disc Sw, Long Shaft Defeatable Door Interlock Handle, Grey Pad

    $124.78
    $192.84
  • 0178229LS Baco Controls 50A 4P (N) Disc Sw, Long Shaft Defeatable Door Interlock Handle, Grey Pad
    Baco Controls

    0178229LS

    50A 4P (N) Disc Sw, Long Shaft Defeatable Door Interlock Handle, Grey Pad

    $131.32
    $202.95
  • 0178239LS Baco Controls 50A 4P (N) + NC/NO Disc Sw, Long Shaft Defeatable Door Interlock Handle, Grey Pad
    Baco Controls

    0178239LS

    50A 4P (N) + NC/NO Disc Sw, Long Shaft Defeatable Door Interlock Handle, Grey Pad

    $141.20
    $218.22
  • 0178249LS Baco Controls 50A 4 Pole Disc Sw, Long Shaft Defeatable Door Interlock Handle, Grey Pad
    Baco Controls

    0178249LS

    50A 4 Pole Disc Sw, Long Shaft Defeatable Door Interlock Handle, Grey Pad

    $133.38
    $206.14
  • 0178259LS Baco Controls 50A 4 Pole + NC/NO Disc Sw, Long Shaft Defeatable Door Interlock Handle, Grey Pad
    Baco Controls

    0178259LS

    50A 4 Pole + NC/NO Disc Sw, Long Shaft Defeatable Door Interlock Handle, Grey Pad

    $143.27
    $221.42
  • 0178309LS Baco Controls 63A 3P Disc Sw, Long Shaft Defeatable Door Interlock Handle, Grey Pad
    Baco Controls

    0178309LS

    63A 3P Disc Sw, Long Shaft Defeatable Door Interlock Handle, Grey Pad

    $130.01
    $200.92
  • 0178319LS Baco Controls 63A 3P + NC/NO Disc Sw, Long Shaft Defeatable Door Interlock Handle, Grey Pad
    Baco Controls

    0178319LS

    63A 3P + NC/NO Disc Sw, Long Shaft Defeatable Door Interlock Handle, Grey Pad

    $139.89
    $216.20
  • 0178329LS Baco Controls 63A 4P (N) Disc Sw, Long Shaft Defeatable Door Interlock Handle, Grey Pad
    Baco Controls

    0178329LS

    63A 4P (N) Disc Sw, Long Shaft Defeatable Door Interlock Handle, Grey Pad

    $149.66
    $231.29
  • 0178339LS Baco Controls 63A 4P (N) + NC/NO Disc Sw, Long Shaft Defeatable Door Interlock Handle, Grey Pad
    Baco Controls

    0178339LS

    63A 4P (N) + NC/NO Disc Sw, Long Shaft Defeatable Door Interlock Handle, Grey Pad

    $159.55
    $246.57
  • 0178349LS Baco Controls 63A 4 Pole Disc Sw, Long Shaft Defeatable Door Interlock Handle, Grey Pad
    Baco Controls

    0178349LS

    63A 4 Pole Disc Sw, Long Shaft Defeatable Door Interlock Handle, Grey Pad

    $151.72
    $234.47
  • 0178359LS Baco Controls 63A 4 Pole + NC/NO Disc Sw, Long Shaft Defeatable Door Interlock Handle, Grey Pad
    Baco Controls

    0178359LS

    63A 4 Pole + NC/NO Disc Sw, Long Shaft Defeatable Door Interlock Handle, Grey Pad

    $161.61
    $249.76
  • 0178409LS Baco Controls 80A 3P Disc Sw, Long Shaft Defeatable Door Interlock Handle, Grey Pad
    Baco Controls

    0178409LS

    80A 3P Disc Sw, Long Shaft Defeatable Door Interlock Handle, Grey Pad

    $145.45
    $224.78
  • 0178419LS Baco Controls 80A 3P + NC/NO Disc Sw, Long Shaft Defeatable Door Interlock Handle, Grey Pad
    Baco Controls

    0178419LS

    80A 3P + NC/NO Disc Sw, Long Shaft Defeatable Door Interlock Handle, Grey Pad

    $155.34
    $240.07
  • 0178429LS Baco Controls 80A 4P (N) Disc Sw, Long Shaft Defeatable Door Interlock Handle, Grey Pad
    Baco Controls

    0178429LS

    80A 4P (N) Disc Sw, Long Shaft Defeatable Door Interlock Handle, Grey Pad

    $168.64
    $260.63
  • 0178439LS Baco Controls 80A 4P (N) + NC/NO Disc Sw, Long Shaft Defeatable Door Interlock Handle, Grey Pad
    Baco Controls

    0178439LS

    80A 4P (N) + NC/NO Disc Sw, Long Shaft Defeatable Door Interlock Handle, Grey Pad

    $178.52
    $275.90
  • 0178449LS Baco Controls 80A 4 Pole Disc Sw, Long Shaft Defeatable Door Interlock Handle, Grey Pad
    Baco Controls

    0178449LS

    80A 4 Pole Disc Sw, Long Shaft Defeatable Door Interlock Handle, Grey Pad

    $170.72
    $263.84
  • 0178459LS Baco Controls 80A 4 Pole + NC/NO Disc Sw, Long Shaft Defeatable Door Interlock Handle, Grey Pad
    Baco Controls

    0178459LS

    80A 4 Pole + NC/NO Disc Sw, Long Shaft Defeatable Door Interlock Handle, Grey Pad

    $180.61
    $279.13
  • 0178509LS Baco Controls 100A 3P Disc Sw, Long Shaft Defeatable Door Interlock Handle, Grey Pad
    Baco Controls

    0178509LS

    100A 3P Disc Sw, Long Shaft Defeatable Door Interlock Handle, Grey Pad

    $175.34
    $270.98
  • 0178519LS Baco Controls 100A 3P + NC/NO Disc Sw, Long Shaft Defeatable Door Interlock Handle, Grey Pad
    Baco Controls

    0178519LS

    100A 3P + NC/NO Disc Sw, Long Shaft Defeatable Door Interlock Handle, Grey Pad

    $185.23
    $286.27
  • 0178529LS Baco Controls 100A 4P (N) Disc Sw, Long Shaft Defeatable Door Interlock Handle, Grey Pad
    Baco Controls

    0178529LS

    100A 4P (N) Disc Sw, Long Shaft Defeatable Door Interlock Handle, Grey Pad

    $201.26
    $311.04
  • 0178539LS Baco Controls 100A 4P (N) + NC/NO Disc Sw, Long Shaft Defeatable Door Interlock Handle, Grey Pad
    Baco Controls

    0178539LS

    100A 4P (N) + NC/NO Disc Sw, Long Shaft Defeatable Door Interlock Handle, Grey Pad

    $211.15
    $326.32
  • 0178549LS Baco Controls 100A 4 Pole Disc Sw, Long Shaft Defeatable Door Interlock Handle, Grey Pad
    Baco Controls

    0178549LS

    100A 4 Pole Disc Sw, Long Shaft Defeatable Door Interlock Handle, Grey Pad

    $203.33
    $314.23
  • 0178559LS Baco Controls 100A 4 Pole + NC/NO Disc Sw, Long Shaft Defeatable Door Interlock Handle, Grey Pad
    Baco Controls

    0178559LS

    100A 4 Pole + NC/NO Disc Sw, Long Shaft Defeatable Door Interlock Handle, Grey Pad

    $213.22
    $329.52
  • 172002 Baco Controls 25A 3P Disc Sw, Panel Mnt, Yel/Red Non-Pad
    Baco Controls

    172002

    25A 3P Disc Sw, Panel Mnt, Yel/Red Non-Pad

    $36.43
    $65.61
  • 172003 Baco Controls 25A 3P Disc Sw, Panel Mnt, Yel/Red Pad 22mm
    Baco Controls

    172003

    25A 3P Disc Sw, Panel Mnt, Yel/Red Pad 22mm

    $35.90
    $64.66

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.