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.

  • 0165059LS Baco Controls 25A 4 Pole + NC/NO Disc Sw, Long Shaft Door Interlock, Yel/Red Pad
    Baco Controls

    0165059LS

    25A 4 Pole + NC/NO Disc Sw, Long Shaft Door Interlock, Yel/Red Pad

    $80.57
    $124.52
  • 0165059SS Baco Controls 25A 4 Pole + NC/NO Disc Sw, Short Shaft Door Interlock, Yel/Red Pad
    Baco Controls

    0165059SS

    25A 4 Pole + NC/NO Disc Sw, Short Shaft Door Interlock, Yel/Red Pad

    $76.88
    $118.82
  • 0165109NS Baco Controls 32A 3P Disc Sw, No Shaft Door Interlock, Yel/Red Pad
    Baco Controls

    0165109NS

    32A 3P Disc Sw, No Shaft Door Interlock, Yel/Red Pad

    $52.03
    $80.41
  • 0165109SS Baco Controls 32A 3P Disc Sw, Short Shaft Door Interlock, Yel/Red Pad
    Baco Controls

    0165109SS

    32A 3P Disc Sw, Short Shaft Door Interlock, Yel/Red Pad

    $54.51
    $84.25
  • 0165119LS Baco Controls 32A 3P + NC/NO Disc Sw, Long Shaft Door Interlock, Yel/Red Pad
    Baco Controls

    0165119LS

    32A 3P + NC/NO Disc Sw, Long Shaft Door Interlock, Yel/Red Pad

    $68.08
    $105.22
  • 0165119NS Baco Controls 32A 3P + NC/NO Disc Sw, No Shaft Door Interlock, Yel/Red Pad
    Baco Controls

    0165119NS

    32A 3P + NC/NO Disc Sw, No Shaft Door Interlock, Yel/Red Pad

    $61.89
    $95.65
  • 0165119SS Baco Controls 32A 3P + NC/NO Disc Sw, Short Shaft Door Interlock, Yel/Red Pad
    Baco Controls

    0165119SS

    32A 3P + NC/NO Disc Sw, Short Shaft Door Interlock, Yel/Red Pad

    $64.36
    $99.47
  • 0165129LS Baco Controls 32A 4P (N) Disc Sw, Long Shaft Door Interlock, Yel/Red Pad
    Baco Controls

    0165129LS

    32A 4P (N) Disc Sw, Long Shaft Door Interlock, Yel/Red Pad

    $72.94
    $112.73
  • 0165129NS Baco Controls 32A 4P (N) Disc Sw, No Shaft Door Interlock, Yel/Red Pad
    Baco Controls

    0165129NS

    32A 4P (N) Disc Sw, No Shaft Door Interlock, Yel/Red Pad

    $66.76
    $103.17
  • 0165129SS Baco Controls 32A 4P (N) Disc Sw, Short Shaft Door Interlock, Yel/Red Pad
    Baco Controls

    0165129SS

    32A 4P (N) Disc Sw, Short Shaft Door Interlock, Yel/Red Pad

    $69.25
    $107.02
  • 0165139LS Baco Controls 32A 4P (N) + NC/NO Disc Sw, Long Shaft Door Interlock, Yel/Red Pad
    Baco Controls

    0165139LS

    32A 4P (N) + NC/NO Disc Sw, Long Shaft Door Interlock, Yel/Red Pad

    $82.82
    $128.00
  • 0165139NS Baco Controls 32A 4P (N) + NC/NO Disc Sw, No Shaft Door Interlock, Yel/Red Pad
    Baco Controls

    0165139NS

    32A 4P (N) + NC/NO Disc Sw, No Shaft Door Interlock, Yel/Red Pad

    $76.66
    $118.48
  • 0165139SS Baco Controls 32A 4P (N) + NC/NO Disc Sw, Short Shaft Door Interlock, Yel/Red Pad
    Baco Controls

    0165139SS

    32A 4P (N) + NC/NO Disc Sw, Short Shaft Door Interlock, Yel/Red Pad

    $79.13
    $122.29
  • 0165149LS Baco Controls 32A 4 Pole Disc Sw, Long Shaft Door Interlock, Yel/Red Pad
    Baco Controls

    0165149LS

    32A 4 Pole Disc Sw, Long Shaft Door Interlock, Yel/Red Pad

    $75.00
    $115.91
  • 0165149SS Baco Controls 32A 4 Pole Disc Sw, Short Shaft Door Interlock, Yel/Red Pad
    Baco Controls

    0165149SS

    32A 4 Pole Disc Sw, Short Shaft Door Interlock, Yel/Red Pad

    $71.32
    $110.22
  • 0165159LS Baco Controls 32A 4 Pole + NC/NO Disc Sw, Long Shaft Door Interlock, Yel/Red Pad
    Baco Controls

    0165159LS

    32A 4 Pole + NC/NO Disc Sw, Long Shaft Door Interlock, Yel/Red Pad

    $84.89
    $131.20
  • 0165159SS Baco Controls 32A 4 Pole + NC/NO Disc Sw, Short Shaft Door Interlock, Yel/Red Pad
    Baco Controls

    0165159SS

    32A 4 Pole + NC/NO Disc Sw, Short Shaft Door Interlock, Yel/Red Pad

    $81.21
    $125.50
  • 0165209LS Baco Controls 50A 3P Disc Sw, Long Shaft Door Interlock, Yel/Red Pad
    Baco Controls

    0165209LS

    50A 3P Disc Sw, Long Shaft Door Interlock, Yel/Red Pad

    $66.96
    $103.49
  • 0165209NS Baco Controls 50A 3P Disc Sw, No Shaft Door Interlock, Yel/Red Pad
    Baco Controls

    0165209NS

    50A 3P Disc Sw, No Shaft Door Interlock, Yel/Red Pad

    $60.80
    $93.97
  • 0165209SS Baco Controls 50A 3P Disc Sw, Short Shaft Door Interlock, Yel/Red Pad
    Baco Controls

    0165209SS

    50A 3P Disc Sw, Short Shaft Door Interlock, Yel/Red Pad

    $63.28
    $97.79
  • 0165219LS Baco Controls 50A 3P + NC/NO Disc Sw, Long Shaft Door Interlock, Yel/Red Pad
    Baco Controls

    0165219LS

    50A 3P + NC/NO Disc Sw, Long Shaft Door Interlock, Yel/Red Pad

    $76.84
    $118.76
  • 0165219NS Baco Controls 50A 3P + NC/NO Disc Sw, No Shaft Door Interlock, Yel/Red Pad
    Baco Controls

    0165219NS

    50A 3P + NC/NO Disc Sw, No Shaft Door Interlock, Yel/Red Pad

    $70.68
    $109.23
  • 0165219SS Baco Controls 50A 3P + NC/NO Disc Sw, Short Shaft Door Interlock, Yel/Red Pad
    Baco Controls

    0165219SS

    50A 3P + NC/NO Disc Sw, Short Shaft Door Interlock, Yel/Red Pad

    $73.16
    $113.07
  • 0165229LS Baco Controls 50A 4P (N) Disc Sw, Long Shaft Door Interlock, Yel/Red Pad
    Baco Controls

    0165229LS

    50A 4P (N) Disc Sw, Long Shaft Door Interlock, Yel/Red Pad

    $83.38
    $128.86
  • 0165229NS Baco Controls 50A 4P (N) Disc Sw, No Shaft Door Interlock, Yel/Red Pad
    Baco Controls

    0165229NS

    50A 4P (N) Disc Sw, No Shaft Door Interlock, Yel/Red Pad

    $77.24
    $119.37
  • 0165229SS Baco Controls 50A 4P (N) Disc Sw, Short Shaft Door Interlock, Yel/Red Pad
    Baco Controls

    0165229SS

    50A 4P (N) Disc Sw, Short Shaft Door Interlock, Yel/Red Pad

    $79.69
    $123.15
  • 0165239LS Baco Controls 50A 4P (N) + NC/NO Disc Sw, Long Shaft Door Interlock, Yel/Red Pad
    Baco Controls

    0165239LS

    50A 4P (N) + NC/NO Disc Sw, Long Shaft Door Interlock, Yel/Red Pad

    $93.26
    $144.13
  • 0165239NS Baco Controls 50A 4P (N) + NC/NO Disc Sw, No Shaft Door Interlock, Yel/Red Pad
    Baco Controls

    0165239NS

    50A 4P (N) + NC/NO Disc Sw, No Shaft Door Interlock, Yel/Red Pad

    $87.09
    $134.59

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.