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.

  • OTS800T1S/3 | ABB Term Shrouds Short Ot800
    ABB

    OTS800T1S/3

    Term Shrouds Short Ot800

    $123.58
    $191.10
  • OTS803-FC | ABB Term Shroud 3P Ot800U30-Fc Flange
    ABB

    OTS803-FC

    Term Shroud 3P Ot800U30-Fc Flange

    $205.44
    $304.98
  • OTV1000ECK | ABB Ot800-1200U_C 3 Pos Dir Mount Hdl
    ABB

    OTV1000ECK

    Ot800-1200U_C 3 Pos Dir Mount Hdl

    $196.49
    $283.12
  • OTV1000ECMK | ABB Otm1000...2500 Direct Mount Handle
    ABB

    OTV1000ECMK

    Otm1000...2500 Direct Mount Handle

    $343.24
    $495.82
  • OTV1000EK | ABB Ot1200 Direct Mount Handle
    ABB

    OTV1000EK

    Ot1200 Direct Mount Handle

    $151.24
    $230.08
  • OTV1000EMK | ABB Direct Mount Handle & Shaft Kit
    ABB

    OTV1000EMK

    Direct Mount Handle & Shaft Kit

    $269.05
    $390.25
  • OTV1000EPK | ABB Ot1200 Direct Mount T Handle
    ABB

    OTV1000EPK

    Ot1200 Direct Mount T Handle

    $151.24
    $217.57
  • OTV250ECK | ABB Ot200 3 Pos Direct Mount Handle
    ABB

    OTV250ECK

    Ot200 3 Pos Direct Mount Handle

    $90.74
    $183.05
  • OTV250EK | ABB Ot200U Direct Mount Handle
    ABB

    OTV250EK

    Ot200U Direct Mount Handle

    $90.74
    $134.70
  • OTV400ECK | ABB Ot400 3 Pos Direct Mount Handle
    ABB

    OTV400ECK

    Ot400 3 Pos Direct Mount Handle

    $112.34
    $181.30
  • OTV400ECMK | ABB Otm315…400_C Direct Mount Handle
    ABB

    OTV400ECMK

    Otm315…400_C Direct Mount Handle

    $219.08
    $315.90
  • OTV400EK | ABB Ot400 Direct Mount Handle
    ABB

    OTV400EK

    Ot400 Direct Mount Handle

    $112.34
    $166.77
  • OTV800ECK | ABB Ot600 3 Pos Direct Mount Handle
    ABB

    OTV800ECK

    Ot600 3 Pos Direct Mount Handle

    $133.95
    $185.37
  • OTV800ECMK | ABB Otm630…800_C Direct Mount Handle
    ABB

    OTV800ECMK

    Otm630…800_C Direct Mount Handle

    $278.11
    $401.45
  • OTV800EK | ABB Direct Mount Hdl Ot600
    ABB

    OTV800EK

    Direct Mount Hdl Ot600

    $133.94
    $198.84
  • OTVS0 | ABB Otm40/125A Hndl Storage Clip
    ABB

    OTVS0

    Otm40/125A Hndl Storage Clip

    $16.80
    $41.55
  • OTVS2 | ABB Storage Clip
    ABB

    OTVS2

    Storage Clip

    $44.84
    $110.93
  • OTZC13 | ABB 3P Jumper Bars Ot200U03C
    ABB

    OTZC13

    3P Jumper Bars Ot200U03C

    $69.14
    $102.63
  • OTZC14 | ABB 4P Jumper Bars Ot200U04C
    ABB

    OTZC14

    4P Jumper Bars Ot200U04C

    $95.08
    $127.37
  • OTZC23 | ABB Connection Bar
    ABB

    OTZC23

    Connection Bar

    $138.26
    $205.25
  • OTZC24 | ABB 4P Jumper Bars Ot400U04C
    ABB

    OTZC24

    4P Jumper Bars Ot400U04C

    $190.13
    $219.83
  • OTZC33 | ABB 3P Jumper Bars Ot600U03C
    ABB

    OTZC33

    3P Jumper Bars Ot600U03C

    $207.40
    $307.88
  • OTZC34 | ABB 4P Jumper Bars Ot600U04C
    ABB

    OTZC34

    4P Jumper Bars Ot600U04C

    $285.18
    $386.85
  • OTZC43 | ABB Bridging Bar
    ABB

    OTZC43

    Bridging Bar

    $896.79
    $1,276.57
  • OTZC44 | ABB Mounting Piece 4-Pole
    ABB

    OTZC44

    Mounting Piece 4-Pole

    $1,182.15
    $1,396.70
  • OTZC53 | ABB 3P Jumper Bars Ot800U03C
    ABB

    OTZC53

    3P Jumper Bars Ot800U03C

    $604.91
    $897.99
  • OTZC54 | ABB 4P Jumper Bars Ot800U04C
    ABB

    OTZC54

    4P Jumper Bars Ot800U04C

    $812.33
    $1,156.20
  • OTZC63 | ABB Bridging Bar For Otm2000_C
    ABB

    OTZC63

    Bridging Bar For Otm2000_C

    $2,575.43
    $3,622.50

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.