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.

  • LS6R0250CBS00L Littelfuse Dc Switch 1500Vdc 250A 2P
    Littelfuse

    LS6R0250CBS00L

    Dc Switch 1500Vdc 250A 2P

    $1,909.68
    $2,853.60
  • LS6R04004DD00L Littelfuse Dc Switch 1500Vdc 400A 1P
    Littelfuse

    LS6R04004DD00L

    Dc Switch 1500Vdc 400A 1P

    $2,092.07
    $3,126.16
  • LS6R0400CBD00L Littelfuse Dc Switch 1500Vdc 400A 2P
    Littelfuse

    LS6R0400CBD00L

    Dc Switch 1500Vdc 400A 2P

    $2,094.61
    $3,129.94
  • LS7R02502PS00L Littelfuse Dc Switch 1500Vdc 250A 2P
    Littelfuse

    LS7R02502PS00L

    Dc Switch 1500Vdc 250A 2P

    $1,834.16
    $2,901.96
  • LS7R03202PS00L Littelfuse Dc Switch 1500Vdc 320A 2P
    Littelfuse

    LS7R03202PS00L

    Dc Switch 1500Vdc 320A 2P

    $1,952.31
    $2,917.32
  • LS7R04002PS00L Littelfuse Dc Switch 1500Vdc 400A 2P
    Littelfuse

    LS7R04002PS00L

    Dc Switch 1500Vdc 400A 2P

    $2,021.78
    $3,021.12
  • LS7R05002PS00L Littelfuse DC Disconnect Switch (1500V DC, 500 Amps, 2P)
    Littelfuse

    LS7R05002PS00L

    DC Disconnect Switch (1500V DC, 500 Amps, 2P)

    $2,291.52
    $3,424.18
  • LST25 | Connector
    Weg

    LST25

    Connector

    $19.36
    $42.00
  • LTFD0101ZX01000 Littelfuse 80Vdc 125A Tls Disconnect W/ Bullet
    Littelfuse

    LTFD0101ZX01000

    80Vdc 125A Tls Disconnect W/ Bullet

    $154.16
    $224.83
  • LTFD0101ZX01113 Littelfuse 80Vdc 125A Tls Disconnect W/ Bullet
    Littelfuse

    LTFD0101ZX01113

    80Vdc 125A Tls Disconnect W/ Bullet

    $154.16
    $224.83
  • LTFD0101ZX1 Littelfuse 80Vdc 100A Tls Disconnect Switch
    Littelfuse

    LTFD0101ZX1

    80Vdc 100A Tls Disconnect Switch

    $166.50
    $242.82
  • LTFD0101ZX1B Littelfuse 80Vdc 125A Tls Disconnect
    Littelfuse

    LTFD0101ZX1B

    80Vdc 125A Tls Disconnect

    $167.05
    $243.64
  • LTFD0101ZX1C Littelfuse 80Vdc 125A Tls Disc Switch Sch C
    Littelfuse

    LTFD0101ZX1C

    80Vdc 125A Tls Disc Switch Sch C

    $154.16
    $224.83
  • LTFD0101ZX2 Littelfuse 80Vdc 100A Tls Disconnect W/Screw
    Littelfuse

    LTFD0101ZX2

    80Vdc 100A Tls Disconnect W/Screw

    $154.16
    $224.83
  • LTFD0101ZX3 Littelfuse 80Vdc 125A Tls Disconnect W/Stud
    Littelfuse

    LTFD0101ZX3

    80Vdc 125A Tls Disconnect W/Stud

    $154.16
    $224.83
  • LTFD0101ZX3C Littelfuse 80Vdc 125A Tls Disc Switch Sch C
    Littelfuse

    LTFD0101ZX3C

    80Vdc 125A Tls Disc Switch Sch C

    $188.07
    $274.28
  • LTFD0101ZX4 Littelfuse 80Vdc 100A Tls Disconnect W/Clip
    Littelfuse

    LTFD0101ZX4

    80Vdc 100A Tls Disconnect W/Clip

    $171.35
    $249.90
  • LTFD1200ZX01 Littelfuse 60Vdc 1200A L17T Disconnect Switch
    Littelfuse

    LTFD1200ZX01

    60Vdc 1200A L17T Disconnect Switch

    $1,630.06
    $2,377.32
  • LTFD1200ZX01A Littelfuse 60Vdc 1200A L17T Disconnect W/Alarm
    Littelfuse

    LTFD1200ZX01A

    60Vdc 1200A L17T Disconnect W/Alarm

    $1,813.52
    $2,644.88
  • LTFD6001ZX00 Littelfuse 145Vdc 600A L17T Disconnect Switch
    Littelfuse

    LTFD6001ZX00

    145Vdc 600A L17T Disconnect Switch

    $1,032.59
    $1,505.96
  • LTFD6001ZX01 Littelfuse 60Vdc 800A L17T Disconnect Switch
    Littelfuse

    LTFD6001ZX01

    60Vdc 800A L17T Disconnect Switch

    $1,091.57
    $1,591.96
  • M1D1002L Noark Switch Disconnector MCS (100 Amps)
    Noark

    M1D1002L

    Switch Disconnector MCS (100 Amps)

    $146.02
    $162.24
  • M1D1003L Noark Switch Disconnector MCS (100 Amps)
    Noark

    M1D1003L

    Switch Disconnector MCS (100 Amps)

    $170.35
    $189.28
  • M1D1502L Noark Switch Disconnector MCS (150 Amps)
    Noark

    M1D1502L

    Switch Disconnector MCS (150 Amps)

    $253.66
    $281.84
  • M1D1503L Noark Switch Disconnector MCS (150 Amps)
    Noark

    M1D1503L

    Switch Disconnector MCS (150 Amps)

    $277.99
    $308.88
  • M1DH1002L Noark MCS UL 489 , M1DH, 150 A Frame Size, 100 kA @ 480 Vac, 100A, 2P, Lug Line/Load Side
    Noark

    M1DH1002L

    MCS UL 489 , M1DH, 150 A Frame Size, 100 kA @ 480 Vac, 100A, 2P, Lug Line/Load Side

    $205.96
    $228.84
  • M1DH1003L Noark MCS UL 489 , M1DH, 150 A Frame Size, 100 kA @ 480 Vac, 100A, 3P, Lug Line/Load Side
    Noark

    M1DH1003L

    MCS UL 489 , M1DH, 150 A Frame Size, 100 kA @ 480 Vac, 100A, 3P, Lug Line/Load Side

    $242.69
    $269.66
  • M1DH1502L Noark Switch Disconnector MCS (150 Amps)
    Noark

    M1DH1502L

    Switch Disconnector MCS (150 Amps)

    $330.41
    $367.12

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.