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.

  • OHBS3 | ABB Dir Mnt Hdl Ot63-80,Ot30-100
    ABB

    OHBS3

    Dir Mnt Hdl Ot63-80,Ot30-100

    $7.34
    $18.15
  • OHBS3AH1 | ABB Selec Handle Black N1 6Mm Shaft
    ABB

    OHBS3AH1

    Selec Handle Black N1 6Mm Shaft

    $20.74
    $30.79
  • OHBS3RH | ABB Sel Hdl Blk Door Mnt W/Screws
    ABB

    OHBS3RH

    Sel Hdl Blk Door Mnt W/Screws

    $20.74
    $30.79
  • OHBS5 | ABB Os30 Direct Mt Handle
    ABB

    OHBS5

    Os30 Direct Mt Handle

    $51.85
    $76.98
  • OHBS7 | ABB Modular Adapter Cover
    ABB

    OHBS7

    Modular Adapter Cover

    $24.20
    $59.88
  • OHBS9 | ABB Direct Mnt Hdl Blk
    ABB

    OHBS9

    Direct Mnt Hdl Blk

    $10.38
    $25.67
  • OHF1C12T | ABB Flange Handle
    ABB

    OHF1C12T

    Flange Handle

    $124.29
    $167.02
  • OHF1C4 | ABB Flange Handle,N4,4X Cable
    ABB

    OHF1C4

    Flange Handle,N4,4X Cable

    $141.93
    $210.68
  • OHF1C4T | ABB T1-T3 Flange Handle Nema 4,4X
    ABB

    OHF1C4T

    T1-T3 Flange Handle Nema 4,4X

    $141.93
    $190.95
  • OHG145J12 | ABB Handle
    ABB

    OHG145J12

    Handle

    $77.78
    $115.45
  • OHG45J6 | ABB Pistol Hdl 6X45Mm Grey
    ABB

    OHG45J6

    Pistol Hdl 6X45Mm Grey

    $60.49
    $89.80
  • OHG65H9K | ABB Pstl Hdl 9X65Mm Grey
    ABB

    OHG65H9K

    Pstl Hdl 9X65Mm Grey

    $229.90
    $331.58
  • OHG65J6 | ABB Pistol Hdl 6X65Mm Grey
    ABB

    OHG65J6

    Pistol Hdl 6X65Mm Grey

    $69.14
    $102.63
  • OHG65J6T | ABB Pstl Hdl 6X65Mm On-Off-Test
    ABB

    OHG65J6T

    Pstl Hdl 6X65Mm On-Off-Test

    $86.84
    $126.28
  • OHG80J6 | ABB Pistol Hdl 6X80Mm Grey
    ABB

    OHG80J6

    Pistol Hdl 6X80Mm Grey

    $77.78
    $115.45
  • OHM125L12 | ABB Pstl Hdl 125X12 4X Ss 316L
    ABB

    OHM125L12

    Pstl Hdl 125X12 4X Ss 316L

    $777.76
    $1,097.90
  • OHM175L12 | ABB Pstl Hdl 175X12 4X Ss 316L
    ABB

    OHM175L12

    Pstl Hdl 175X12 4X Ss 316L

    $950.58
    $1,411.14
  • OHM200L12P | ABB 12X200Mm T-Style Disc,Hdl 316 Ss
    ABB

    OHM200L12P

    12X200Mm T-Style Disc,Hdl 316 Ss

    $1,002.44
    $1,159.12
  • OHM275L12 | ABB Pstl Hdl 275X12 4X Ss 316L
    ABB

    OHM275L12

    Pstl Hdl 275X12 4X Ss 316L

    $1,037.04
    $1,465.60
  • OHM45L6 | ABB Pstl Hdl 45X6 4X Ss 316L
    ABB

    OHM45L6

    Pstl Hdl 45X6 4X Ss 316L

    $604.93
    $713.90
  • OHM65L6 | ABB Pstl Hdl 65X6 4X Ss 316L
    ABB

    OHM65L6

    Pstl Hdl 65X6 4X Ss 316L

    $648.13
    $962.14
  • OHRS12 | ABB Direct Mt Hdl Ot16-40 Xfer Red
    ABB

    OHRS12

    Direct Mt Hdl Ot16-40 Xfer Red

    $14.69
    $21.81
  • OHRS2 | ABB Direct Mnt Hdl Ot16-125 Red
    ABB

    OHRS2

    Direct Mnt Hdl Ot16-125 Red

    $13.84
    $34.22
  • OHRS3 | ABB Dr Mt Hdl Ot63-80,Ot30-100 Red
    ABB

    OHRS3

    Dr Mt Hdl Ot63-80,Ot30-100 Red

    $7.78
    $19.25
  • OHRS9 | ABB Direct Mnt Hdl Red
    ABB

    OHRS9

    Direct Mnt Hdl Red

    $10.38
    $25.67
  • OHY125J12 | ABB Pstl Hdl 12X125Mm Red/Yl 3R,12
    ABB

    OHY125J12

    Pstl Hdl 12X125Mm Red/Yl 3R,12

    $77.78
    $115.45
  • OHY145J12E002S | ABB Pstl Hdl 12X145 R/Y Side Oper
    ABB

    OHY145J12E002S

    Pstl Hdl 12X145 R/Y Side Oper

    $69.14
    $99.82
  • OHY145L12 | ABB Disconnect Handle
    ABB

    OHY145L12

    Disconnect Handle

    $112.34
    $166.77

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.