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.

  • OSFC7/B10 | ABB Fuse Window And Label Set Os200J
    ABB

    OSFC7/B10

    Fuse Window And Label Set Os200J

    $190.71
    $223.93
  • OSGZD1 | ABB 35Mm Din Rail Adptr Os60Gj/100Gj
    ABB

    OSGZD1

    35Mm Din Rail Adptr Os60Gj/100Gj

    $38.98
    $57.86
  • OSS1203-FC | ABB Term Shroud 3P Os1200L30-Fc Flange
    ABB

    OSS1203-FC

    Term Shroud 3P Os1200L30-Fc Flange

    $251.10
    $372.76
  • OSS1250G1S/3 | ABB Term Shroud For Os1200 3P Short
    ABB

    OSS1250G1S/3

    Term Shroud For Os1200 3P Short

    $196.49
    $227.17
  • OSS160GG1L/3 | ABB Term Shroud For Os100Gj 3P Long
    ABB

    OSS160GG1L/3

    Term Shroud For Os100Gj 3P Long

    $53.80
    $79.87
  • OSS160GG1L/4 | ABB Term Shroud Long 4P Os100G-160G
    ABB

    OSS160GG1L/4

    Term Shroud Long 4P Os100G-160G

    $68.49
    $79.17
  • OSS160GG1S/3 | ABB Term Shroud For Os100Gj 3P Short Ie
    ABB

    OSS160GG1S/3

    Term Shroud For Os100Gj 3P Short Ie

    $28.70
    $42.60
  • OSS160GG1S/4 | ABB Os100G ..160G Shroud 4 Pk
    ABB

    OSS160GG1S/4

    Os100G ..160G Shroud 4 Pk

    $54.58
    $107.10
  • OSS200G1L/3 | ABB Term Shroud For Os200 3P Long
    ABB

    OSS200G1L/3

    Term Shroud For Os200 3P Long

    $43.21
    $64.14
  • OSS200G1L/4 | ABB 4 Pole Long Type Shrouds Os200
    ABB

    OSS200G1L/4

    4 Pole Long Type Shrouds Os200

    $58.29
    $104.60
  • OSS200G1S/4 | ABB Term Shroud For Os200 4P Short
    ABB

    OSS200G1S/4

    Term Shroud For Os200 4P Short

    $52.73
    $69.88
  • OSS250G1L/3 | ABB Terminal Shroud
    ABB

    OSS250G1L/3

    Terminal Shroud

    $57.08
    $65.98
  • OSS400G1L/3 | ABB Term Shroud For Os400 3P Long
    ABB

    OSS400G1L/3

    Term Shroud For Os400 3P Long

    $86.43
    $128.29
  • OSS400G1S/3 | ABB Term Shroud For Os400 3P Short
    ABB

    OSS400G1S/3

    Term Shroud For Os400 3P Short

    $91.61
    $135.99
  • OSS400G3LS | ABB Term Shrd For Os200-400 3P Long Iec
    ABB

    OSS400G3LS

    Term Shrd For Os200-400 3P Long Iec

    $71.75
    $104.05
  • OSS800G1L/3 | ABB Terminal Shrouds For Os600/800
    ABB

    OSS800G1L/3

    Terminal Shrouds For Os600/800

    $224.19
    $332.81
  • OSS800G1S/3 | ABB Terminal Shroud
    ABB

    OSS800G1S/3

    Terminal Shroud

    $81.53
    $115.00
  • OSS803-FC | ABB Term Shroud 3P Os800L30-Fc Flange
    ABB

    OSS803-FC

    Term Shroud 3P Os800L30-Fc Flange

    $205.44
    $304.98
  • OSV1250DK | ABB Ot1250 Direct Mnt Hndl
    ABB

    OSV1250DK

    Ot1250 Direct Mnt Hndl

    $293.91
    $424.33
  • OSV200BK | ABB Os200 Direct Mount Handle
    ABB

    OSV200BK

    Os200 Direct Mount Handle

    $109.24
    $162.17
  • OSV400BK | ABB Os400 Direct Mount Handle
    ABB

    OSV400BK

    Os400 Direct Mount Handle

    $149.50
    $221.93
  • OSV800DK | ABB Os600/800 Direct Mount Handle
    ABB

    OSV800DK

    Os600/800 Direct Mount Handle

    $172.84
    $248.87
  • OSVY200BK | ABB Os200 Direct Mount Handle R/Y
    ABB

    OSVY200BK

    Os200 Direct Mount Handle R/Y

    $115.80
    $155.50
  • OSVY800DK | ABB Os600/800 Direct Mount Hdl Red/Ye
    ABB

    OSVY800DK

    Os600/800 Direct Mount Hdl Red/Ye

    $172.84
    $248.87
  • OSZ1 | ABB N-Pole For 0S60 Switch
    ABB

    OSZ1

    N-Pole For 0S60 Switch

    $40.76
    $100.85
  • OSZ2 | ABB Neutral Pole,Os100 Switch
    ABB

    OSZ2

    Neutral Pole,Os100 Switch

    $40.76
    $100.85
  • OSZ4 | ABB Aux Holder Os30 Oa_G_
    ABB

    OSZ4

    Aux Holder Os30 Oa_G_

    $16.30
    $24.20
  • OSZT1A | ABB Off Mech Intlk Os200
    ABB

    OSZT1A

    Off Mech Intlk Os200

    $388.89
    $449.67

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.