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.

  • OFM260 | ABB 3Ph Fuse Monitor 100-260Vac
    ABB

    OFM260

    3Ph Fuse Monitor 100-260Vac

    $300.03
    $346.92
  • OFM600 | ABB Fuse Monitor 380-600V
    ABB

    OFM600

    Fuse Monitor 380-600V

    $250.61
    $338.47
  • OFM690 | ABB 3Ph Fuse Monitor 690Vac Iec
    ABB

    OFM690

    3Ph Fuse Monitor 690Vac Iec

    $250.61
    $361.58
  • OFMZX2 | ABB Os30-100 Ofm 6-Term Kit
    ABB

    OFMZX2

    Os30-100 Ofm 6-Term Kit

    $17.29
    $24.05
  • OFMZX4 | ABB Oes200-800 Ofm 6-Term Kit
    ABB

    OFMZX4

    Oes200-800 Ofm 6-Term Kit

    $60.49
    $87.48
  • OFS260 | ABB 3Ph Fuse Monitor 100-260Vac
    ABB

    OFS260

    3Ph Fuse Monitor 100-260Vac

    $328.38
    $386.78
  • OHB125J12E011 | ABB Pistol Handle, I - 0 - Ii
    ABB

    OHB125J12E011

    Pistol Handle, I - 0 - Ii

    $129.63
    $189.35
  • OHB125J12EH | ABB Pstl Hdl 125X12 3R,12 Ss Hasp
    ABB

    OHB125J12EH

    Pstl Hdl 125X12 3R,12 Ss Hasp

    $241.98
    $349.07
  • OHB125L10 | ABB Pistol Hdl 125Mm Ul Type 4,4X
    ABB

    OHB125L10

    Pistol Hdl 125Mm Ul Type 4,4X

    $271.48
    $403.01
  • OHB125L12 | ABB Pstl Hdl 12X125Mm Black 4/4X
    ABB

    OHB125L12

    Pstl Hdl 12X125Mm Black 4/4X

    $105.99
    $157.33
  • OHB125L12EH | ABB Pstl Hdl 125X12 4X Ss Hasp
    ABB

    OHB125L12EH

    Pstl Hdl 125X12 4X Ss Hasp

    $285.18
    $423.34
  • OHB125LH12 | ABB Pstl Hdl 12X125Mm Black 4/4X
    ABB

    OHB125LH12

    Pstl Hdl 12X125Mm Black 4/4X

    $105.98
    $153.32
  • OHB145J12 | ABB Pstl Hdl 12X145Mm Black 3R,12
    ABB

    OHB145J12

    Pstl Hdl 12X145Mm Black 3R,12

    $77.78
    $115.45
  • OHB145J12E00B | ABB Pstl Hdl Mirror Image 12X145
    ABB

    OHB145J12E00B

    Pstl Hdl Mirror Image 12X145

    $95.08
    $235.22
  • OHB145J12E00S | ABB Pstl Hdl 12X145 Blk Side Op
    ABB

    OHB145J12E00S

    Pstl Hdl 12X145 Blk Side Op

    $69.14
    $100.23
  • OHB145J12E011 | ABB Pistol Handle 3-P 12X145 Black 3
    ABB

    OHB145J12E011

    Pistol Handle 3-P 12X145 Black 3

    $112.34
    $166.77
  • OHB145J12E20 | ABB Pst Hdl 12X145 P/L On-Off
    ABB

    OHB145J12E20

    Pst Hdl 12X145 P/L On-Off

    $95.08
    $235.22
  • OHB145L12 | ABB Pstl Hdl 12X145Mm Black 4/4X
    ABB

    OHB145L12

    Pstl Hdl 12X145Mm Black 4/4X

    $112.34
    $166.77
  • OHB145L12E011 | ABB Pstl Hdl Xfer 12X145Mm N4X
    ABB

    OHB145L12E011

    Pstl Hdl Xfer 12X145Mm N4X

    $163.08
    $205.78
  • OHB145L12E311 | ABB Pstl Hdl 3-Pos 12X145Mm Pl-3
    ABB

    OHB145L12E311

    Pstl Hdl 3-Pos 12X145Mm Pl-3

    $138.26
    $173.95
  • OHB175J12E011 | ABB Pstl Hdl 3-Pos 12X175 Blk 3R12
    ABB

    OHB175J12E011

    Pstl Hdl 3-Pos 12X175 Blk 3R12

    $120.98
    $299.32
  • OHB175J12E20EH | ABB Pstl Hdl 175X12 3R,12 Ss Hasp Onoff
    ABB

    OHB175J12E20EH

    Pstl Hdl 175X12 3R,12 Ss Hasp Onoff

    $216.04
    $249.82
  • OHB175J12EH | ABB Pstl Hdl 175X12 3R,12 Ss Hasp
    ABB

    OHB175J12EH

    Pstl Hdl 175X12 3R,12 Ss Hasp

    $285.18
    $385.37
  • OHB175L10 | ABB Pistol Hdl 175Mm Ul Type
    ABB

    OHB175L10

    Pistol Hdl 175Mm Ul Type

    $291.86
    $433.27
  • OHB175L12 | ABB Handle
    ABB

    OHB175L12

    Handle

    $120.98
    $179.59
  • OHB175L12E011 | ABB Pstl Hdl 3-Pos 12X175 Blk 4X
    ABB

    OHB175L12E011

    Pstl Hdl 3-Pos 12X175 Blk 4X

    $155.56
    $281.93
  • OHB175L12E311 | ABB Pstl Hdl 3-Pos 12X145Mm Pl-3
    ABB

    OHB175L12E311

    Pstl Hdl 3-Pos 12X145Mm Pl-3

    $142.60
    $198.77

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.