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.

  • OHZX12 | ABB 316 Ss Hasp For Selector Hdl
    ABB

    OHZX12

    316 Ss Hasp For Selector Hdl

    $146.90
    $218.08
  • OHZX14 | ABB Ext. Ring For Pistol Handle
    ABB

    OHZX14

    Ext. Ring For Pistol Handle

    $60.49
    $87.48
  • OHZX17/B100 | ABB Special Hdl Kit 6Mm Base Bulk100
    ABB

    OHZX17/B100

    Special Hdl Kit 6Mm Base Bulk100

    $3,427.40
    $8,479.75
  • OHZX19 | ABB Overturn Protection Ot1000/Ot1250
    ABB

    OHZX19

    Overturn Protection Ot1000/Ot1250

    $106.29
    $192.12
  • OHZX4 | ABB Door Interlock Bracket
    ABB

    OHZX4

    Door Interlock Bracket

    $30.25
    $74.83
  • OHZX6 | ABB Pstl Hdl Adptr For Ot30...100Ft3
    ABB

    OHZX6

    Pstl Hdl Adptr For Ot30...100Ft3

    $17.29
    $25.66
  • OPB2 | ABB Legend Plate Black For Oh2 Hdl
    ABB

    OPB2

    Legend Plate Black For Oh2 Hdl

    $6.53
    $16.13
  • OPB2EN1 | ABB L/P Main Sw Ohb/Y1,2
    ABB

    OPB2EN1

    L/P Main Sw Ohb/Y1,2

    $10.38
    $11.98
  • OPB3 | ABB Oh Pstl Hdl Legend Plate
    ABB

    OPB3

    Oh Pstl Hdl Legend Plate

    $23.34
    $57.73
  • OPBS1EN1 | ABB Lgd Plt Mn Sw Blk
    ABB

    OPBS1EN1

    Lgd Plt Mn Sw Blk

    $8.98
    $12.45
  • OPX3EN1 | ABB Main Sw Legend Plt For Pstl Hdl
    ABB

    OPX3EN1

    Main Sw Legend Plt For Pstl Hdl

    $17.51
    $21.38
  • OPY2EN1 | ABB L/P Main Switch Ohb/Y2
    ABB

    OPY2EN1

    L/P Main Switch Ohb/Y2

    $10.38
    $25.67
  • OPYS1EN1 | ABB Legend Plate Yellow Oh1,3 Main Sw
    ABB

    OPYS1EN1

    Legend Plate Yellow Oh1,3 Main Sw

    $25.29
    $35.93
  • OS100GJ02 | ABB Switch Fuse
    ABB

    OS100GJ02

    Switch Fuse

    $396.21
    $536.07
  • OS100GJ04F | ABB 4P Sw 100A J Fuse 600V Ul98
    ABB

    OS100GJ04F

    4P Sw 100A J Fuse 600V Ul98

    $659.09
    $892.83
  • OS100GJ12 | ABB 3P Sw 100A J Fuse 600V Ul98
    ABB

    OS100GJ12

    3P Sw 100A J Fuse 600V Ul98

    $494.30
    $733.80
  • OS100GJ12P | ABB 3P Sw 100A J Fuse W/ Hdl And Shaft
    ABB

    OS100GJ12P

    3P Sw 100A J Fuse W/ Hdl And Shaft

    $354.25
    $479.12
  • OS100GJ22F | ABB Fusible Switch 100A 4P
    ABB

    OS100GJ22F

    Fusible Switch 100A 4P

    $658.73
    $989.37
  • OS100GJ30 | ABB 3P Sw 100A J Fuse 600V Ul98
    ABB

    OS100GJ30

    3P Sw 100A J Fuse 600V Ul98

    $494.30
    $733.80
  • OS100GJS20 | ABB 2P Sw 100A J Fuse Side Op
    ABB

    OS100GJS20

    2P Sw 100A J Fuse Side Op

    $499.76
    $676.62
  • OS100GJS30 | ABB 3P Sw 100A J Fuse Side Op
    ABB

    OS100GJS30

    3P Sw 100A J Fuse Side Op

    $735.38
    $850.30
  • OS1200L02 | ABB 2P 1200A Class L Fuse Sw
    ABB

    OS1200L02

    2P 1200A Class L Fuse Sw

    $10,428.14
    $17,309.03
  • OS1200L03 | ABB 3P 1200A Class L Fuse Sw
    ABB

    OS1200L03

    3P 1200A Class L Fuse Sw

    $11,597.06
    $17,215.90
  • OS1200L04F | ABB 4P 1200A Fusible Sw
    ABB

    OS1200L04F

    4P 1200A Fusible Sw

    $13,916.86
    $20,465.62
  • OS1200L12 | ABB 3P 1200A Class L Fuse Sw
    ABB

    OS1200L12

    3P 1200A Class L Fuse Sw

    $11,597.39
    $17,054.40
  • OS1200L30 | ABB 3P 1200A Class L Fuse Sw
    ABB

    OS1200L30

    3P 1200A Class L Fuse Sw

    $11,597.39
    $15,738.13
  • OS1200L30-FC | ABB 3P Sw 1200A L Fuse Flange Cable Mec
    ABB

    OS1200L30-FC

    3P Sw 1200A L Fuse Flange Cable Mec

    $7,772.63
    $11,538.51
  • OS125GD03 | ABB 3P Sw 125A Din Fuse 690V Iec
    ABB

    OS125GD03

    3P Sw 125A Din Fuse 690V Iec

    $842.18
    $1,198.70

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.