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.

  • LK3R9EM | Eaton Rotary disconnect line and load terminal lugs
    Eaton

    LK3R9EM

    Rotary disconnect line and load terminal lugs

    $227.40
    $646.95
  • LK3R9FN | Eaton Rotary disconnect line and load terminal lugs
    Eaton

    LK3R9FN

    Rotary disconnect line and load terminal lugs

    $407.74
    $1,160.01
  • LK4R9DL | Eaton Rotary disconnect line and load terminal lugs
    Eaton

    LK4R9DL

    Rotary disconnect line and load terminal lugs

    $60.24
    $171.39
  • LK4R9EM | Eaton Rotary disconnect line and load terminal lugs
    Eaton

    LK4R9EM

    Rotary disconnect line and load terminal lugs

    $302.25
    $859.89
  • LK4R9FN | Eaton Rotary disconnect line and load terminal lugs
    Eaton

    LK4R9FN

    Rotary disconnect line and load terminal lugs

    $542.48
    $1,543.31
  • LK6R9G | Eaton Rotary disconnect line and load terminal lugs
    Eaton

    LK6R9G

    Rotary disconnect line and load terminal lugs

    $593.81
    $1,689.35
  • LK8R9G | Eaton Rotary disconnect mounting spacers
    Eaton

    LK8R9G

    Rotary disconnect mounting spacers

    $789.13
    $2,245.02
  • LM30303DJ Littelfuse Class J Disc Switch 30A 3P+Nd
    Littelfuse

    LM30303DJ

    Class J Disc Switch 30A 3P+Nd

    $1,755.41
    $2,623.08
  • LM30303NJ Littelfuse Class J Disc Switch 30A 3P+N
    Littelfuse

    LM30303NJ

    Class J Disc Switch 30A 3P+N

    $1,755.41
    $2,623.08
  • LM30303PJ Littelfuse Class J Disc Switch 30A 3P
    Littelfuse

    LM30303PJ

    Class J Disc Switch 30A 3P

    $1,367.41
    $2,043.30
  • LM30603DJ Littelfuse Class J Disc Switch 60A 3P+Nd
    Littelfuse

    LM30603DJ

    Class J Disc Switch 60A 3P+Nd

    $2,248.66
    $3,360.12
  • LM30603NJ Littelfuse Class J Disc Switch 60A 3P+N
    Littelfuse

    LM30603NJ

    Class J Disc Switch 60A 3P+N

    $2,248.66
    $3,360.12
  • LM30603PJ Littelfuse Class J Disc Switch 60A 3P
    Littelfuse

    LM30603PJ

    Class J Disc Switch 60A 3P

    $2,446.55
    $2,688.14
  • LM31003DJ Littelfuse Class J Disc Switch 100A 3P+Nd
    Littelfuse

    LM31003DJ

    Class J Disc Switch 100A 3P+Nd

    $4,424.80
    $6,611.90
  • LM31003NJ Littelfuse Class J Disc Switch 100A 3P+N
    Littelfuse

    LM31003NJ

    Class J Disc Switch 100A 3P+N

    $4,424.80
    $6,611.90
  • LM31003PJ Littelfuse Class J Disc Switch 100A 3P
    Littelfuse

    LM31003PJ

    Class J Disc Switch 100A 3P

    $3,439.66
    $5,139.82
  • LM32003DJ Littelfuse Class J Disc Switch 200A 3P+Nd
    Littelfuse

    LM32003DJ

    Class J Disc Switch 200A 3P+Nd

    $5,585.40
    $8,346.18
  • LM32003NJ Littelfuse Class J Disc Switch 200A 3P+N
    Littelfuse

    LM32003NJ

    Class J Disc Switch 200A 3P+N

    $5,585.40
    $8,346.18
  • LM32003PJ Littelfuse Class J Disc Switch 200A 3P
    Littelfuse

    LM32003PJ

    Class J Disc Switch 200A 3P

    $4,341.86
    $6,487.98
  • LS602501MS00L Littelfuse Dc Switch 1000Vdc 250A 1P
    Littelfuse

    LS602501MS00L

    Dc Switch 1000Vdc 250A 1P

    $1,584.93
    $2,368.34
  • LS602501VS00L Littelfuse Dc Switch 500Vdc 250A 1P
    Littelfuse

    LS602501VS00L

    Dc Switch 500Vdc 250A 1P

    $924.02
    $1,380.76
  • LS602502ES00L Littelfuse Dc Switch 1000Vdc 250A 2P
    Littelfuse

    LS602502ES00L

    Dc Switch 1000Vdc 250A 2P

    $1,496.88
    $2,368.34
  • LS602502LS00L Littelfuse Dc Switch 500Vdc 250A 2P
    Littelfuse

    LS602502LS00L

    Dc Switch 500Vdc 250A 2P

    $1,004.78
    $1,501.42
  • LS604001MS00L Littelfuse Dc Switch 1000Vdc 400A 1P
    Littelfuse

    LS604001MS00L

    Dc Switch 1000Vdc 400A 1P

    $2,002.07
    $2,991.66
  • LS604001VS00L Littelfuse Dc Switch 500Vdc 400A 1P
    Littelfuse

    LS604001VS00L

    Dc Switch 500Vdc 400A 1P

    $1,170.41
    $1,748.92
  • LS604002ES00L Littelfuse Dc Switch 1000Vdc 400A 2P
    Littelfuse

    LS604002ES00L

    Dc Switch 1000Vdc 400A 2P

    $2,373.71
    $4,005.42
  • LS604002LS00L Littelfuse Dc Switch 500Vdc 400A 2P
    Littelfuse

    LS604002LS00L

    Dc Switch 500Vdc 400A 2P

    $1,591.77
    $1,748.92
  • LS6R02504DS00L Littelfuse Dc Switch 1500Vdc 250A 1P
    Littelfuse

    LS6R02504DS00L

    Dc Switch 1500Vdc 250A 1P

    $1,909.68
    $2,853.60

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.