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.

  • 172563 Baco Controls 100A 4 Pole Disc Sw, Encl, Yel/Red Pad
    Baco Controls

    172563

    100A 4 Pole Disc Sw, Encl, Yel/Red Pad

    $234.21
    $421.86
  • 172565 Baco Controls 100A Neutral Pole
    Baco Controls

    172565

    100A Neutral Pole

    $23.55
    $42.43
  • 172566 Baco Controls 100A 4 Pole Disc Sw, Encl, Yel/Red Non-Pad
    Baco Controls

    172566

    100A 4 Pole Disc Sw, Encl, Yel/Red Non-Pad

    $237.03
    $426.95
  • 172567 Baco Controls 80/100A 3P Terminal Cover
    Baco Controls

    172567

    80/100A 3P Terminal Cover

    $3.53
    $6.36
  • 172569 Baco Controls Empty Enclosure 50/63A up to 4P + Aux
    Baco Controls

    172569

    Empty Enclosure 50/63A up to 4P + Aux

    $43.89
    $79.05
  • 172571 Baco Controls 100A 3P + NC/NO Disc Sw, Encl, Yel/Red Pad
    Baco Controls

    172571

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

    $217.74
    $392.19
  • 172572 Baco Controls 100A 3P + NC/NO Disc Sw, Encl, Yel/Red Pad
    Baco Controls

    172572

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

    $220.57
    $397.31
  • 172573 Baco Controls 100A 4 Pole + NC/NO Disc Sw, Encl, Yel/Red Pad
    Baco Controls

    172573

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

    $243.19
    $438.04
  • 172575 Baco Controls 100A Additional Pole
    Baco Controls

    172575

    100A Additional Pole

    $25.45
    $45.83
  • 172576 Baco Controls 100A 4 Pole + NC/NO Disc Sw, Encl, Yel/Red Non-Pad
    Baco Controls

    172576

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

    $246.02
    $443.14
  • 172577 Baco Controls 80/100A 3P Terminal Cover
    Baco Controls

    172577

    80/100A 3P Terminal Cover

    $2.66
    $4.79
  • 172579 Baco Controls Empty Enclosure 50/63A up to 6P + Aux
    Baco Controls

    172579

    Empty Enclosure 50/63A up to 6P + Aux

    $45.06
    $81.15
  • 172581 Baco Controls 100A 4P (N) Disc Sw, Encl, Yel/Red Pad
    Baco Controls

    172581

    100A 4P (N) Disc Sw, Encl, Yel/Red Pad

    $249.41
    $449.23
  • 172582 Baco Controls 100A 4P (N) Disc Sw, Encl, Yel/Red Pad
    Baco Controls

    172582

    100A 4P (N) Disc Sw, Encl, Yel/Red Pad

    $252.25
    $454.37
  • 172585 Baco Controls 80/100A Junction/Terminal Block
    Baco Controls

    172585

    80/100A Junction/Terminal Block

    $26.42
    $47.58
  • 172589 Baco Controls Empty Enclosure 80/100A up to 4P + Aux
    Baco Controls

    172589

    Empty Enclosure 80/100A up to 4P + Aux

    $106.48
    $191.80
  • 172591 Baco Controls 100A 4P (N) + NC/NO Disc Sw, Encl, Yel/Red Pad
    Baco Controls

    172591

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

    $258.37
    $465.40
  • 172592 Baco Controls 100A 4P (N) + NC/NO Disc Sw, Encl, Yel/Red Pad
    Baco Controls

    172592

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

    $261.20
    $470.49
  • 172595 Baco Controls Early Break Aux Block for 80/100A Disc
    Baco Controls

    172595

    Early Break Aux Block for 80/100A Disc

    $12.80
    $23.07
  • 172599 Baco Controls Empty Enclosure 80/100A up to 6P + Aux
    Baco Controls

    172599

    Empty Enclosure 80/100A up to 6P + Aux

    $121.70
    $219.21
  • 172602 Baco Controls Yel/Red 64mm Non-Pad Handle/Legend
    Baco Controls

    172602

    Yel/Red 64mm Non-Pad Handle/Legend

    $12.77
    $23.00
  • 172603 Baco Controls Yel/Red 66mm Pad Handle 22mm Mnt
    Baco Controls

    172603

    Yel/Red 66mm Pad Handle 22mm Mnt

    $11.77
    $21.21
  • 172604 Baco Controls Yel/Red 48mm Non-Pad Handle/Legend 22mm Mnt
    Baco Controls

    172604

    Yel/Red 48mm Non-Pad Handle/Legend 22mm Mnt

    $13.74
    $24.74
  • 172612 Baco Controls Yel/Red 72mm Non-Pad Handle/Legend
    Baco Controls

    172612

    Yel/Red 72mm Non-Pad Handle/Legend

    $14.72
    $26.52
  • 172622 Baco Controls Yel/Red 96mm Non-Pad Handle/Legend
    Baco Controls

    172622

    Yel/Red 96mm Non-Pad Handle/Legend

    $16.68
    $30.05
  • 172629 Baco Controls Duty Label for Padlockable Handles Blank
    Baco Controls

    172629

    Duty Label for Padlockable Handles Blank

    $3.25
    $5.85
  • 172649 Baco Controls Duty Label for Padlockable Handles Main Switch
    Baco Controls

    172649

    Duty Label for Padlockable Handles Main Switch

    $3.25
    $5.85
  • 174001 Baco Controls 25A 3P Disc Sw, Panel Mnt, Grey Pad
    Baco Controls

    174001

    25A 3P Disc Sw, Panel Mnt, Grey Pad

    $34.06
    $61.35

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.