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.

  • 172000 Baco Controls 25A 3P Disc Sw, Body Only
    Baco Controls

    172000

    25A 3P Disc Sw, Body Only

    $30.63
    $53.95
  • 174061 Baco Controls 25A 3P Disc Sw, Encl, Grey Pad
    Baco Controls

    174061

    25A 3P Disc Sw, Encl, Grey Pad

    $52.68
    $94.87
  • 174301 Baco Controls 63A 3P Disc Sw, Panel Mnt, Grey Pad
    Baco Controls

    174301

    63A 3P Disc Sw, Panel Mnt, Grey Pad

    $59.15
    $106.55
  • BBS45-5 | Motor protective circuit breaker | Weg
    Weg

    BBS45-5

    Motor protective circuit breaker

    $27.66
    $60.00
  • DT362UGK Eaton Heavy Duty Double-Throw Non-Fused Safety Switch (60A, 3P, 600V AC, 250V DC)
    Eaton

    DT362UGK

    Heavy Duty Double-Throw Non-Fused Safety Switch (60A, 3P, 600V AC, 250V DC)

    $884.58
    $3,344.15
  • EHMCCB | Eaton EG HANDLE MECH WHITE / BLACK
    Eaton

    EHMCCB

    EG HANDLE MECH WHITE / BLACK

    $208.26
    $347.11
  • EOT16U3P3-S | ABB 3P Disconnect Switch, 20A Nf N3R
    ABB

    EOT16U3P3-S

    3P Disconnect Switch, 20A Nf N3R

  • ES50A Noark Extended Handle Shaft, 500mm, Cross section10×10mm, 3P M1/M2
    Noark

    ES50A

    Extended Handle Shaft, 500mm, Cross section10×10mm, 3P M1/M2

    $53.41
  • HM2A Noark Handle Operating Mechanism (10x10mm)
    Noark

    HM2A

    Handle Operating Mechanism (10x10mm)

    $27.22
    $42.27
  • K8C060 | ABB Os/Ot 800-1200A Flange Cable 60 Inc
    ABB

    K8C060

    Os/Ot 800-1200A Flange Cable 60 Inc

    $514.16
    $763.27
  • K8C084 | ABB Os/Ot 800-1200A Flange Cable 84 Inc
    ABB

    K8C084

    Os/Ot 800-1200A Flange Cable 84 Inc

    $672.58
    $998.45
  • K9FCH4 | ABB Os/Ot 800-1200A Flange Handle 4/4X
    ABB

    K9FCH4

    Os/Ot 800-1200A Flange Handle 4/4X

    $953.39
    $1,415.30
  • LPE55GN | Insulated Enclosure
    Weg

    LPE55GN

    Insulated Enclosure

    $25.36
    $55.00
  • MPW40-3-U010 (6.3-10 A)
    Weg

    MPW40-3-U010

    MPW40-3-U010 (6.3-10 A)

    $63.16
    $137.00
  • MSW 40 P-3 H | Disconnect Switch with Handle (Red/Yellow)
    Weg

    MSW 40 P-3 H

    Disconnect Switch with Handle (Red/Yellow)

  • MSW H 80 B
    Weg

    MSW H 80 B

    Rotary Handle and Shaft

    $19.76
    $45.00
  • MSW HS 185-40 | Shaft for Rotary Handle
    Weg

    MSW HS 185-40

    Shaft for Rotary Handle

    $5.27
    $12.00
  • MSW HS 300-160 | Shaft for Rotary Handle
    Weg

    MSW HS 300-160

    Shaft for Rotary Handle

    $11.41
    $26.00
  • OHB125J12 | ABB Pstl Hdl 12X125Mm Black 3R, 12
    ABB

    OHB125J12

    Pstl Hdl 12X125Mm Black 3R, 12

    $77.78
    $115.45
  • OHB145J12E002S | ABB Pstl Handle Side Mount, 12X145 B
    ABB

    OHB145J12E002S

    Pstl Handle Side Mount, 12X145 B

    $69.14
    $100.23
  • OHB150J12P | ABB 12X150Mm T-Style Disc, Hdl
    ABB

    OHB150J12P

    12X150Mm T-Style Disc, Hdl

    $103.70
    $153.95
  • OHB330J12T | ABB Pstl Hdl 12X330Mm Blk N3R Test Pos
    ABB

    OHB330J12T

    Pstl Hdl 12X330Mm Blk N3R Test Pos

    $190.13
    $425.95
  • OHB95J12E69 | ABB Pstl Hdl Black 1,3R,12 For Ot_Cf 6M
    ABB

    OHB95J12E69

    Pstl Hdl Black 1,3R,12 For Ot_Cf 6M

    $91.61
    $122.67
  • OHBS16 | ABB Direct Hdl 6Mm Padlck Ot160G Bl/Rd
    ABB

    OHBS16

    Direct Hdl 6Mm Padlck Ot160G Bl/Rd

    $40.70
    $58.32
  • OHF1C12 | ABB Flange Handle,N1,3R,12
    ABB

    OHF1C12

    Flange Handle,N1,3R,12

    $124.29
    $184.50

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.