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.

  • OS400J12 | ABB 3P Sw 400A J Fuse Ul98
    ABB

    OS400J12

    3P Sw 400A J Fuse Ul98

    $1,668.05
    $2,262.18
  • OS400J30 | ABB 3P Sw 400A J Fuse Ul98 Rh
    ABB

    OS400J30

    3P Sw 400A J Fuse Ul98 Rh

    $1,768.08
    $2,624.72
  • OS400JS20 | ABB 4P Sw 400A J Fuse Ul98 Side Oper
    ABB

    OS400JS20

    4P Sw 400A J Fuse Ul98 Side Oper

    $1,945.23
    $2,638.37
  • OS400JS30 | ABB 3P Sw 400A J Fuse Side Oper
    ABB

    OS400JS30

    3P Sw 400A J Fuse Side Oper

    $2,636.90
    $6,523.98
  • OS400JS40F | ABB 4P Sw 400A J Fuse Ul98 Side Oper
    ABB

    OS400JS40F

    4P Sw 400A J Fuse Ul98 Side Oper

    $2,866.49
    $7,092.00
  • OS40FD12000 | ABB Din000 Fusible 40A
    ABB

    OS40FD12000

    Din000 Fusible 40A

    $851.95
    $985.10
  • OS50GF12 | ABB 3P 50A Fusible Sw 690V Iec
    ABB

    OS50GF12

    3P 50A Fusible Sw 690V Iec

    $461.86
    $625.17
  • OS600J02 | ABB 2P 600A Fusible Sw
    ABB

    OS600J02

    2P 600A Fusible Sw

    $2,471.58
    $6,114.93
  • OS600J04F | ABB 4P Fus Sw 600A 600V J Fuse
    ABB

    OS600J04F

    4P Fus Sw 600A 600V J Fuse

    $5,262.54
    $7,815.27
  • OS600J12 | ABB 3P Sw 600A J Fuse 600V Ul98
    ABB

    OS600J12

    3P Sw 600A J Fuse 600V Ul98

    $4,385.14
    $5,949.78
  • OS600J30 | ABB 3P Sw 600A J Fuse 600V Ul98
    ABB

    OS600J30

    3P Sw 600A J Fuse 600V Ul98

    $4,385.03
    $6,509.59
  • OS60GJ04F | ABB Switch Fuse
    ABB

    OS60GJ04F

    Switch Fuse

    $675.85
    $797.82
  • OS60GJ12 | ABB 3P Sw 60A J Fuse 600V Ul98
    ABB

    OS60GJ12

    3P Sw 60A J Fuse 600V Ul98

    $361.23
    $536.24
  • OS60GJ22F | ABB 4P Sw 60A J Fuse 600V Ul98
    ABB

    OS60GJ22F

    4P Sw 60A J Fuse 600V Ul98

    $558.96
    $794.08
  • OS60GJS30 | ABB 3P Sw 60A J Fuse Side Op
    ABB

    OS60GJS30

    3P Sw 60A J Fuse Side Op

    $361.68
    $536.91
  • OS630D03 | ABB 3P Sw 630A Din Fuse 690V Iec
    ABB

    OS630D03

    3P Sw 630A Din Fuse 690V Iec

    $4,069.23
    $5,724.58
  • OS630D12 | ABB 3P Sw 630A Din Fuse 690V Iec
    ABB

    OS630D12

    3P Sw 630A Din Fuse 690V Iec

    $4,191.30
    $5,896.40
  • OS63GD03 | ABB 3P Fused 63A 690V Iec
    ABB

    OS63GD03

    3P Fused 63A 690V Iec

    $382.35
    $442.12
  • OS63GD12 | ABB 3P Sw 63A Din Fuse 690V Iec
    ABB

    OS63GD12

    3P Sw 63A Din Fuse 690V Iec

    $656.29
    $889.03
  • OS800D03 | ABB Switch Fuse
    ABB

    OS800D03

    Switch Fuse

    $4,524.88
    $6,365.78
  • OS800L02 | ABB 2P 800A Fusible Sw
    ABB

    OS800L02

    2P 800A Fusible Sw

    $3,232.96
    $5,416.08
  • OS800L04F | ABB 4P 800A Fusible Sw
    ABB

    OS800L04F

    4P 800A Fusible Sw

    $5,335.95
    $7,924.28
  • OS800L12 | ABB 3P 800A Fusible Sw
    ABB

    OS800L12

    3P 800A Fusible Sw

    $4,524.75
    $6,717.01
  • OS800L21 | ABB 3P 800A Fusible Sw
    ABB

    OS800L21

    3P 800A Fusible Sw

    $6,787.31
    $13,523.95
  • OS800L30 | ABB 3P 800A Fusible Sw
    ABB

    OS800L30

    3P 800A Fusible Sw

    $4,524.88
    $6,139.43
  • OS800L30-FC | ABB 3P Sw 800A L Fuse Flange Cable Mech
    ABB

    OS800L30-FC

    3P Sw 800A L Fuse Flange Cable Mech

    $5,000.05
    $7,422.60
  • OSFC11 | ABB Fuse Cover Kit
    ABB

    OSFC11

    Fuse Cover Kit

    $34.23
    $61.97
  • OSFC2/B10 | ABB Fuse Cover Kit (Incl.10 Pcs) Os60Gj
    ABB

    OSFC2/B10

    Fuse Cover Kit (Incl.10 Pcs) Os60Gj

    $128.24
    $291.20

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.