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.

  • CAS12N3V2500 Noark Cassette for 3200A Frame (A32) ACB, 3 Pole, Vertical type, 2000A/2500A
    Noark

    CAS12N3V2500

    Cassette for 3200A Frame (A32) ACB, 3 Pole, Vertical type, 2000A/2500A

    $4,802.56
    $5,336.18
  • CAS12N3V3200 Noark Cassette for 3200A Frame (A32) ACB, 3 Pole, Vertical type, 3200A Frame
    Noark

    CAS12N3V3200

    Cassette for 3200A Frame (A32) ACB, 3 Pole, Vertical type, 3200A Frame

    $5,338.41
    $5,931.57
  • CAS12N4H1600 Noark Cassette for 3200A Frame (A32) ACB, 4 Pole, Horizontal type, 800A/1600A
    Noark

    CAS12N4H1600

    Cassette for 3200A Frame (A32) ACB, 4 Pole, Horizontal type, 800A/1600A

    $5,976.86
    $6,640.95
  • CAS12N4H2500 Noark Cassette for 3200A Frame (A32) ACB, 4 Pole, Horizontal type, 2000A/2500A
    Noark

    CAS12N4H2500

    Cassette for 3200A Frame (A32) ACB, 4 Pole, Horizontal type, 2000A/2500A

    $6,724.31
    $7,471.46
  • CAS12N4V1600 Noark Cassette for 3200A Frame (A32) ACB, 4 Pole, Vertical type, 800A/1600A
    Noark

    CAS12N4V1600

    Cassette for 3200A Frame (A32) ACB, 4 Pole, Vertical type, 800A/1600A

    $5,976.86
    $6,640.95
  • CAS12N4V2500 Noark Cassette for 3200A Frame (A32), 4 Pole, Vertical type, 2000A/2500A
    Noark

    CAS12N4V2500

    Cassette for 3200A Frame (A32), 4 Pole, Vertical type, 2000A/2500A

    $6,724.31
    $7,471.46
  • CAS12N4V3200 Noark Cassette for 3200A Frame (A32) ACB, 4 Pole, Vertical type, 3200A Frame
    Noark

    CAS12N4V3200

    Cassette for 3200A Frame (A32) ACB, 4 Pole, Vertical type, 3200A Frame

    $7,471.76
    $8,301.96
  • CDP11N Noark Door Frame, for 2500A Frame, A25/ASD25
    Noark

    CDP11N

    Door Frame, for 2500A Frame, A25/ASD25

    $32.72
    $36.36
  • CDP12N Noark Doorframes for fix type, For 3200A/4000 Frame (A32/A40) ACB
    Noark

    CDP12N

    Doorframes for fix type, For 3200A/4000 Frame (A32/A40) ACB

    $48.98
    $54.42
  • CKLB21 Noark Lugs to Busbar Conversion Kit (M1) Suitable for Line side OR Load side connections.
    Noark

    CKLB21

    Lugs to Busbar Conversion Kit (M1) Suitable for Line side OR Load side connections.

    $12.62
    $14.02
  • CKLB22 Noark Lugs to Busbar Conversion Kit (M2) Suitable for Line side OR Load side connections.
    Noark

    CKLB22

    Lugs to Busbar Conversion Kit (M2) Suitable for Line side OR Load side connections.

    $12.62
  • CLT25 | Weg Current Limiter Block
    Weg

    CLT25

    Current Limiter Block

  • CLT32 MPW40 | Current Limiter Block | Weg
    Weg

    CLT32 MPW40

    Current Limiter Block

    $46.10
    $100.00
  • CSD Weg Buspar Shroud
    Weg

    CSD

    Buspar Shroud

  • CXBY68234 | ABB Oh Sel Hdl Lock Nut
    ABB

    CXBY68234

    Oh Sel Hdl Lock Nut

    $8.64
    $10.05
  • CXBY68339/P | ABB Oh Pstl Hdl Hasp Red
    ABB

    CXBY68339/P

    Oh Pstl Hdl Hasp Red

    $8.31
    $11.52
  • CXBY68419/6/2M | ABB Direct Mt Hdl Ot63-100F Blk
    ABB

    CXBY68419/6/2M

    Direct Mt Hdl Ot63-100F Blk

    $11.41
    $16.94
  • DCJUMPD2 | Eaton Rotary disconnect jumper kit, Selector handle, padlockable, Handle
    Eaton

    DCJUMPD2

    Rotary disconnect jumper kit, Selector handle, padlockable, Handle

    $35.95
    $80.22
  • DCJUMPE2 | Eaton Rotary disconnect jumper kit
    Eaton

    DCJUMPE2

    Rotary disconnect jumper kit

    $118.58
    $267.11
  • DDP11N Noark Doorframe, For 2500A Frame (A25) ACB, Drawout type
    Noark

    DDP11N

    Doorframe, For 2500A Frame (A25) ACB, Drawout type

    $36.04
    $40.04
  • DDP12N Noark Doorframes for drawout type, For 3200A Frame (A32) ACB
    Noark

    DDP12N

    Doorframes for drawout type, For 3200A Frame (A32) ACB

    $52.96
    $58.84
  • DHR9DE | Eaton Rotary disconnect direct handle
    Eaton

    DHR9DE

    Rotary disconnect direct handle

    $105.50
    $300.14
  • DHR9FG | Eaton Rotary disconnect direct handle
    Eaton

    DHR9FG

    Rotary disconnect direct handle

    $152.55
    $433.99
  • DHR9J2M | Eaton Rotary disconnect direct handle
    Eaton

    DHR9J2M

    Rotary disconnect direct handle

    $105.50
    $300.14
  • DHR9N | Eaton Rotary Disconnect Handles
    Eaton

    DHR9N

    Rotary Disconnect Handles

    $152.55
    $433.99
  • DPS12N2 Noark Phase barrier for drawout type, For 3200A Frame (A32) ACB, 2 pcs for 3P
    Noark

    DPS12N2

    Phase barrier for drawout type, For 3200A Frame (A32) ACB, 2 pcs for 3P

    $64.30
    $71.44
  • DPS12N3 Noark Phase barrier for drawout type, For 3200A Frame (A32) ACB, 3 pcs for 4P
    Noark

    DPS12N3

    Phase barrier for drawout type, For 3200A Frame (A32) ACB, 3 pcs for 4P

    $97.28
    $108.09
  • DPS12N4 Noark Phase barrier for A32 ACB draw out type, 4 pcs for 3P - 3200A
    Noark

    DPS12N4

    Phase barrier for A32 ACB draw out type, 4 pcs for 3P - 3200A

    $129.71
    $144.12

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.