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.

  • OTDC200US11 | ABB Switch-Disconnector
    ABB

    OTDC200US11

    Switch-Disconnector

    $717.44
    $1,379.43
  • OTDC200US20 | ABB Switch-Disconnector
    ABB

    OTDC200US20

    Switch-Disconnector

    $717.44
    $1,089.30
  • OTDC200US33 | ABB 6P 200A Nf Sw 1000Vdc Ul98B 3 Ckts
    ABB

    OTDC200US33

    6P 200A Nf Sw 1000Vdc Ul98B 3 Ckts

    $1,469.11
    $3,353.63
  • OTDC245U02 | ABB 2P 245A Pv Sw 1000Vdc
    ABB

    OTDC245U02

    2P 245A Pv Sw 1000Vdc

    $745.88
    $2,241.80
  • OTDC250UF02 | ABB 2P 250A Ul Pv Sw 1000Vdc
    ABB

    OTDC250UF02

    2P 250A Ul Pv Sw 1000Vdc

    $951.99
    $2,355.30
  • OTDC250UF11 | ABB 2P 250A Ul Pv Sw 1000Vdc
    ABB

    OTDC250UF11

    2P 250A Ul Pv Sw 1000Vdc

    $951.99
    $1,290.35
  • OTDC250UF22 | ABB 4P 250A Ul Pv Sw 1000Vdc
    ABB

    OTDC250UF22

    4P 250A Ul Pv Sw 1000Vdc

    $1,758.95
    $4,015.57
  • OTDC25F2 | ABB 2 Pole 25 Amp Disconnector Switch
    ABB

    OTDC25F2

    2 Pole 25 Amp Disconnector Switch

    $199.63
    $269.27
  • OTDC25F3 | 3 Pole 25 Amp Disconnector Switch
    ABB

    OTDC25F3

    3 Pole 25 Amp Disconnector Switch

    $285.18
    $329.75
  • OTDC25F4 | ABB 4 Pole 25 Amp Disconnector Switch
    ABB

    OTDC25F4

    4 Pole 25 Amp Disconnector Switch

    $418.26
    $566.00
  • OTDC25FT4 | ABB 4 P 25 Amp Disconnector Sw Door Mnt
    ABB

    OTDC25FT4

    4 P 25 Amp Disconnector Sw Door Mnt

    $418.26
    $1,034.83
  • OTDC25U2 | ABB 2P Nf Sw 600Vdc 25A Ul508I Base/Din
    ABB

    OTDC25U2

    2P Nf Sw 600Vdc 25A Ul508I Base/Din

    $167.35
    $240.90
  • OTDC25UT2 | ABB 2P 25A 600Vdc Nf Sw Door Mnt Ul508I
    ABB

    OTDC25UT2

    2P 25A 600Vdc Nf Sw Door Mnt Ul508I

    $167.14
    $225.17
  • OTDC320UF02 | ABB 2P 320A Ul Pv Sw 1000Vdc
    ABB

    OTDC320UF02

    2P 320A Ul Pv Sw 1000Vdc

    $974.24
    $2,410.37
  • OTDC320UF11 | ABB 320A 2-Pole Pv 1000Vdc Disc Sw
    ABB

    OTDC320UF11

    320A 2-Pole Pv 1000Vdc Disc Sw

    $973.95
    $2,409.67
  • OTDC320UF22 | ABB 4P 320A Ul Pv Sw 1000Vdc
    ABB

    OTDC320UF22

    4P 320A Ul Pv Sw 1000Vdc

    $1,801.29
    $4,456.60
  • OTDC320UFV11 | ABB 320A 2-Pole Pv 1500Vdc Disc Sw
    ABB

    OTDC320UFV11

    320A 2-Pole Pv 1500Vdc Disc Sw

    $1,217.44
    $1,438.47
  • OTDC320UFV11-ESS | ABB 2P 320A Dc Sw 1500Vdc For Ess App
    ABB

    OTDC320UFV11-ESS

    2P 320A Dc Sw 1500Vdc For Ess App

    $2,054.80
    $2,889.87
  • OTDC32F2 | ABB 2 Pole 32 Amp Switch Disconnector
    ABB

    OTDC32F2

    2 Pole 32 Amp Switch Disconnector

    $237.65
    $587.98
  • OTDC32F3 | ABB 3 Pole 32 Amp Disconnector Switch
    ABB

    OTDC32F3

    3 Pole 32 Amp Disconnector Switch

    $332.71
    $449.88
  • OTDC32F4 | ABB 4 Pole 32 Amp Disconnector Switch
    ABB

    OTDC32F4

    4 Pole 32 Amp Disconnector Switch

    $475.30
    $549.58
  • OTDC32FT3 | ABB 3P 32A Nf Sw 1000Vdc Iec Door Mt
    ABB

    OTDC32FT3

    3P 32A Nf Sw 1000Vdc Iec Door Mt

    $343.24
    $396.85
  • OTDC32U4 | ABB 4P 32A Nf Sw 600Vdc Ul508I W/O Jump
    ABB

    OTDC32U4

    4P 32A Nf Sw 600Vdc Ul508I W/O Jump

    $282.08
    $697.90
  • OTDC32US4 | ABB 4P 32A Nf Sw 600Vdc Ul508I W Jump
    ABB

    OTDC32US4

    4P 32A Nf Sw 600Vdc Ul508I W Jump

    $291.88
    $444.88
  • OTDC400UF02 | ABB 2P 400A Ul Pv Sw 1000Vdc
    ABB

    OTDC400UF02

    2P 400A Ul Pv Sw 1000Vdc

    $1,080.49
    $2,673.25
  • OTDC400UF02S | ABB 2P 400A Pv Sw 1000Vdc Ul98B Side Op
    ABB

    OTDC400UF02S

    2P 400A Pv Sw 1000Vdc Ul98B Side Op

    $1,234.15
    $2,816.97
  • OTDC400UF11 | ABB 2P 400A Ul Pv Sw 1000Vdc
    ABB

    OTDC400UF11

    2P 400A Ul Pv Sw 1000Vdc

    $1,080.49
    $1,553.80
  • OTDC400UF22 | ABB 400A 4-Pole Pv 1000Vdc Disc Sw
    ABB

    OTDC400UF22

    400A 4-Pole Pv 1000Vdc Disc Sw

    $1,998.41
    $4,944.28

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.