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.

  • 172400 Baco Controls 80A 3P Disc Sw, Body Only
    Baco Controls

    172400

    80A 3P Disc Sw, Body Only

    $69.78
    $125.69
  • 172621 Baco Controls Yel/Red 86mm Pad Handle
    Baco Controls

    172621

    Yel/Red 86mm Pad Handle

    $23.99
  • OA1G10 | ABB 1-No Aux Sw Ot/Os
    ABB

    OA1G10

    1-No Aux Sw Ot/Os

    $16.84
    $25.00
  • OHYS2RJ | Sel Hdl Red/Yel Dr Mnt W/Screw
    ABB

    OHYS2RJ

    Sel Hdl Red/Yel Dr Mnt W/Screw

    $24.20
    $35.93
  • BBS45-2 | Motor protective circuit breaker MPW18/40 | Weg
    Weg

    BBS45-2

    Motor protective circuit breaker MPW18/40

    $14.75
    $32.00
  • BBS54-2 | Motor protective circuit breaker | Weg
    Weg

    BBS54-2

    Motor protective circuit breaker

    $14.74
    $32.00
  • OHB175J12E20 | ABB Pstl Hdl 12X175 P/L On-Off
    ABB

    OHB175J12E20

    Pstl Hdl 12X175 P/L On-Off

    $103.71
    $256.58
  • OSS1250G1L/3 | ABB Terminal Shrouds Os1200
    ABB

    OSS1250G1L/3

    Terminal Shrouds Os1200

    $179.36
    $266.26
  • OT80F3U | ABB 3P Sw 80A Nf Metal Collar
    ABB

    OT80F3U

    3P Sw 80A Nf Metal Collar

    $127.38
    $189.09
  • SF320PH10X10 | Rotary disconnect shaft extension
    Eaton

    SF320PH10X10

    Rotary disconnect shaft extension

    $52.40
    $149.09
  • SFGAB | Eaton Rotary disconnect door interlocked external handle
    Eaton

    SFGAB

    Rotary disconnect door interlocked external handle

    $6.70
    $19.06
  • XTPB025BC1 | Eaton Miniature Circuit Breaker (25 Amps)
    Eaton

    XTPB025BC1

    Miniature Circuit Breaker (25 Amps)

    $102.20
    $491.32
  • 0172200 Baco Controls Disconnect Switch Body (50A, 3P)
    Baco Controls

    172200

    Disconnect Switch Body (50A, 3P)

    $42.00
    $75.67
  • BBS45-4 | Motor Protector | Weg
    Weg

    BBS45-4

    Motor Protector

    $20.77
    $45.00
  • MPW40-3-U016 (10.0-16.0 A)
    Weg

    MPW40-3-U016

    MPW40-3-U016 (10.0-16.0 A)

    $69.15
    $150.00
  • MPW40-3-U020 (16-20 A)
    Weg

    MPW40-3-U020

    MPW40-3-U020 (16-20 A)

    $76.07
    $165.00
  • OA7G10 | ABB Auxiliary Contact Block 1No
    ABB

    OA7G10

    Auxiliary Contact Block 1No

    $17.29
    $25.66
  • OHB65L6E011 | ABB Pstl Hdl Xfer 6X65Mm N4/4X
    ABB

    OHB65L6E011

    Pstl Hdl Xfer 6X65Mm N4/4X

    $105.99
    $157.33
  • OS100GJ03 | ABB 3P Sw 100A J Fuse 600V Ul98
    ABB

    OS100GJ03

    3P Sw 100A J Fuse 600V Ul98

    $494.30
    $733.80
  • PHR2N4XFT | Eaton Rotary Disconnect Handles
    Eaton

    PHR2N4XFT

    Rotary Disconnect Handles

    $186.78
    $531.35
  • R9C3060U | Eaton Rotary disconnect switch
    Eaton

    R9C3060U

    Rotary disconnect switch

    $243.79
    $693.57
  • BBSP45-4 | Weg Distribution Busbar
    Weg

    BBSP45-4

    Distribution Busbar

  • OS200J03 | ABB 3P Sw 200A J Fuse Ul98 Lh
    ABB

    OS200J03

    3P Sw 200A J Fuse Ul98 Lh

    $1,311.80
    $1,947.37
  • OSS200G1S/3 | ABB Term Shroud For Os200 3P Short
    ABB

    OSS200G1S/3

    Term Shroud For Os200 3P Short

    $40.76
    $60.51
  • OZXA-27/3P | ABB Term.Kit,600A Nf Sw 3 Lugs
    ABB

    OZXA-27/3P

    Term.Kit,600A Nf Sw 3 Lugs

    $164.19
    $243.74
  • PHR2N12F | Eaton Rotary Disconnect Handles
    Eaton

    PHR2N12F

    Rotary Disconnect Handles

    $103.38
    $294.08
  • PHR2N4XF | Eaton Rotary Disconnect Handles
    Eaton

    PHR2N4XF

    Rotary Disconnect Handles

    $181.78
    $517.15
  • DH367NRK | Eaton Heavy Duty Single-Throw Fused Safety Switch (800A, 3P, 600V, NEMA 3R)
    Eaton

    DH367NRK

    Heavy Duty Single-Throw Fused Safety Switch (800A, 3P, 600V, NEMA 3R)

    $9,468.71
    $52,241.20

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.