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.

  • OXS6X57 | ABB Sel Shaft 6X57
    ABB

    OXS6X57

    Sel Shaft 6X57

    $7.78
    $11.55
  • OXS6X73 | ABB Sel Shaft 6X73
    ABB

    OXS6X73

    Sel Shaft 6X73

    $5.19
    $8.00
  • OXS6X73/B100 | ABB Sel Shft 6X73, Qty1=Pack100
    ABB

    OXS6X73/B100

    Sel Shft 6X73, Qty1=Pack100

    $518.50
    $859.03
  • OXS6X85 | ABB Sel Shaft 6X85
    ABB

    OXS6X85

    Sel Shaft 6X85

    $3.45
    $5.13
  • OXS6X90.5/B100 | ABB 6mm x 90.5mm Shaft for Selector Handle (Pack of 100)
    ABB

    OXS6X90.5/B100

    6mm x 90.5mm Shaft for Selector Handle (Pack of 100)

    $503.85
    $1,149.07
  • OXS6X95 | ABB Sel Shaft 6X95
    ABB

    OXS6X95

    Sel Shaft 6X95

    $5.19
    $7.70
  • OXS6X95/B100 | ABB Shaft Incl. 100 Pcs
    ABB

    OXS6X95/B100

    Shaft Incl. 100 Pcs

    $518.50
    $1,182.55
  • OXT20X210X | ABB Shaft Reinfcmt Tube Ot800 - 1200 Sw
    ABB

    OXT20X210X

    Shaft Reinfcmt Tube Ot800 - 1200 Sw

    $108.44
    $158.10
  • OZ331P67B | ABB Round Handle Black Ip69K - 1Sca1114
    ABB

    OZ331P67B

    Round Handle Black Ip69K - 1Sca1114

    $77.78
    $112.97
  • OZ331P67RY | ABB Ip67 Selec Hndl P Lockable Red/Yel
    ABB

    OZ331P67RY

    Ip67 Selec Hndl P Lockable Red/Yel

    $77.78
    $115.45
  • OZ331PB | ABB Nema 4X Padlockable Selector Handle
    ABB

    OZ331PB

    Nema 4X Padlockable Selector Handle

    $64.81
    $86.30
  • OZ331PRY | ABB N4X Padlockable Sel Hndl R/Y
    ABB

    OZ331PRY

    N4X Padlockable Sel Hndl R/Y

    $64.81
    $75.00
  • OZ331RB | ABB Rcs Handle
    ABB

    OZ331RB

    Rcs Handle

    $29.65
    $70.57
  • OZ331SPRY | ABB Rcs Rnd Pdlk Hdl R/Y
    ABB

    OZ331SPRY

    Rcs Rnd Pdlk Hdl R/Y

    $79.04
    $112.89
  • OZ371PB | ABB Hndl On Pos, Ip65 - 1Sca111684R1
    ABB

    OZ371PB

    Hndl On Pos, Ip65 - 1Sca111684R1

    $104.41
    $188.68
  • OZ371PRY | ABB Padl.Handle/Central Mounting
    ABB

    OZ371PRY

    Padl.Handle/Central Mounting

    $88.85
    $129.28
  • OZXA-100-3P ABB Lug Kit (wire range 1x 14 - 2/0 AWG)
    ABB

    OZXA-100-3P

    Lug Kit (wire range 1x 14 - 2/0 AWG)

    $16.60
    $33.33
  • OZXA-1200E/3 | ABB Term Lug Kit 3 Lugs For Eoh_368
    ABB

    OZXA-1200E/3

    Term Lug Kit 3 Lugs For Eoh_368

    $969.01
    $2,211.45
  • OZXA-39 | ABB Connection Bar
    ABB

    OZXA-39

    Connection Bar

    $113.19
    $280.03
  • OZXA-604 | ABB Mechanical Lug Kit
    ABB

    OZXA-604

    Mechanical Lug Kit

    $476.00
    $550.38
  • OZXA-7 | ABB Terminal Lug Kit Nf100
    ABB

    OZXA-7

    Terminal Lug Kit Nf100

    $21.61
    $27.67
  • OZXA-800E/3 | ABB Term Lug Kit 3 Lugs For Eoh365 Load
    ABB

    OZXA-800E/3

    Term Lug Kit 3 Lugs For Eoh365 Load

    $900.23
    $1,099.60
  • OZXA200/1 | ABB Lug Kit 4-300, Qty 1/Bag
    ABB

    OZXA200/1

    Lug Kit 4-300, Qty 1/Bag

    $69.39
    $171.67
  • OZXA32 | ABB 4P Jumper Bars Ot16 40F3C
    ABB

    OZXA32

    4P Jumper Bars Ot16 40F3C

    $147.83
    $170.92
  • OZXA40 | ABB Parallel Conneciton Terminal
    ABB

    OZXA40

    Parallel Conneciton Terminal

    $122.29
    $181.54
  • OZXA41 | ABB Parallel Connect Kit Ot100F4C
    ABB

    OZXA41

    Parallel Connect Kit Ot100F4C

    $274.75
    $360.48
  • OZXB-1K | ABB Terminal For Fuse Base Size 00
    ABB

    OZXB-1K

    Terminal For Fuse Base Size 00

    $36.31
    $89.82
  • OZXB-1L | ABB Terminal For Fuse Base Size 00
    ABB

    OZXB-1L

    Terminal For Fuse Base Size 00

    $145.18
    $195.37

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.