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.

  • ER54040UG | Eaton Rotary Disconnect Switch (40 Amps, 4 Pole, 600VAC)
    Eaton

    ER54040UG

    Rotary Disconnect Switch (40 Amps, 4 Pole, 600VAC)

    $634.16
    $1,237.37
  • ER54040UW | Eaton Enclosed Rotary Disconnect Switch (40 Amps, 4 Pole, 600VAC)
    Eaton

    ER54040UW

    Enclosed Rotary Disconnect Switch (40 Amps, 4 Pole, 600VAC)

    $1,745.78
    $3,406.38
  • ER54040UX | Eaton Enclosed Rotary Disconnect Switch (40 Amps, 4 Pole, 600VAC)
    Eaton

    ER54040UX

    Enclosed Rotary Disconnect Switch (40 Amps, 4 Pole, 600VAC)

    $1,371.69
    $2,676.45
  • ERH32F10G Noark Extend Rotary Handle Front mount 10in (254mm) Grey Panel/Green Handle
    Noark

    ERH32F10G

    Extend Rotary Handle Front mount 10in (254mm) Grey Panel/Green Handle

    $96.03
    $106.70
  • ERH32F10Y Noark Extend Rotary Handle Front mount 10in (254mm) Yellow Panel/Red Handle
    Noark

    ERH32F10Y

    Extend Rotary Handle Front mount 10in (254mm) Yellow Panel/Red Handle

    $96.03
    $106.70
  • ERH32S10G Noark Extend Rotary Handle Side mount (Left) 10in (254mm) Grey Panel/Green Handle
    Noark

    ERH32S10G

    Extend Rotary Handle Side mount (Left) 10in (254mm) Grey Panel/Green Handle

    $96.03
    $106.70
  • ERH32S10Y Noark Extend Rotary Handle Side mount (Left) 10in (254mm) Yellow Panel/Red Handle
    Noark

    ERH32S10Y

    Extend Rotary Handle Side mount (Left) 10in (254mm) Yellow Panel/Red Handle

    $96.03
    $106.70
  • ERH51B Noark Ex9S32 Extended rotary handle, standard type, dark grey, 32 A
    Noark

    ERH51B

    Ex9S32 Extended rotary handle, standard type, dark grey, 32 A

    $35.68
  • ERH51Y Noark Ex9S32 Extended rotary handle, emergency stop type, yellow/red, 32 A
    Noark

    ERH51Y

    Ex9S32 Extended rotary handle, emergency stop type, yellow/red, 32 A

    $44.25
  • ES20A Noark Extended Handle Shaft, 200mm, Cross section10×10mm 3P M1/M2
    Noark

    ES20A

    Extended Handle Shaft, 200mm, Cross section10×10mm 3P M1/M2

    $15.28
    $21.13
  • ES20B Noark Extended Handle Shaft, 200mm, Cross section12×12mm M3/M4/M5/M6
    Noark

    ES20B

    Extended Handle Shaft, 200mm, Cross section12×12mm M3/M4/M5/M6

    $28.31
    $31.45
  • ES20C Noark Extended Handle Shaft, 200mm, Cross section: breaker end 10×10mm, handle end 6×6mm, 2P M1/M2
    Noark

    ES20C

    Extended Handle Shaft, 200mm, Cross section: breaker end 10×10mm, handle end 6×6mm, 2P M1/M2

    $19.00
    $21.11
  • ES26BA Noark Extended Handle Shaft, 260mm, M3HV, Cross section: breaker end 12×12mm², cabinet end 10×10 mm²
    Noark

    ES26BA

    Extended Handle Shaft, 260mm, M3HV, Cross section: breaker end 12×12mm², cabinet end 10×10 mm²

    $30.49
    $33.88
  • ES3220 Noark Stand along Extension Rotary Shaft 20in (500mm）
    Noark

    ES3220

    Stand along Extension Rotary Shaft 20in (500mm）

    $47.18
    $52.42
  • ES32A Noark Extended Handle Shaft, 320mm, Cross section10×10mm, 3P M1/M2
    Noark

    ES32A

    Extended Handle Shaft, 320mm, Cross section10×10mm, 3P M1/M2

    $28.59
  • ES32B Noark Extended Handle Shaft, 320mm, Cross section12×12mm, M3/M4/M5/M6
    Noark

    ES32B

    Extended Handle Shaft, 320mm, Cross section12×12mm, M3/M4/M5/M6

    $32.54
    $36.15
  • ES32C Noark Extended Handle Shaft, 320mm, Cross section: breaker end 10×10mm, handle end 6×6mm,2P, M1/M2
    Noark

    ES32C

    Extended Handle Shaft, 320mm, Cross section: breaker end 10×10mm, handle end 6×6mm,2P, M1/M2

    $23.40
    $26.00
  • ES50B Noark Extended Handle Shaft, 500mm, Cross section12×12mm, M3/M4/M5/M6
    Noark

    ES50B

    Extended Handle Shaft, 500mm, Cross section12×12mm, M3/M4/M5/M6

    $53.52
    $67.60
  • ES50C Noark Extended Handle Shaft, 500mm, Cross section: breaker end 10×10mm, handle end 6×6mm, 2P M1/M2
    Noark

    ES50C

    Extended Handle Shaft, 500mm, Cross section: breaker end 10×10mm, handle end 6×6mm, 2P M1/M2

    $47.18
    $52.42
  • ESKV20 | ABB Plastic Compression Glands
    ABB

    ESKV20

    Plastic Compression Glands

    $0.81
    $0.93
  • FSB10 Noark Flexible Shaft Type B (10 ft)
    Noark

    FSB10

    Flexible Shaft Type B (10 ft)

    $157.77
    $175.30
  • FSB2 Noark Flexible Shaft Type B (2 ft)
    Noark

    FSB2

    Flexible Shaft Type B (2 ft)

    $105.51
    $117.23
  • FSB3 Noark Flexible Shaft Type B (3 ft)
    Noark

    FSB3

    Flexible Shaft Type B (3 ft)

    $110.41
    $122.68
  • FSB4 Noark Flexible Shaft Type B (4 ft)
    Noark

    FSB4

    Flexible Shaft Type B (4 ft)

    $117.19
    $130.21
  • FSB5 Noark Flexible Shaft Type B (5 ft)
    Noark

    FSB5

    Flexible Shaft Type B (5 ft)

    $124.87
    $138.74
  • FSB6 Noark Flexible Shaft Type B (6 ft)
    Noark

    FSB6

    Flexible Shaft Type B (6 ft)

    $131.64
    $146.27
  • FSB7 Noark Flexible Shaft Type B (7 ft)
    Noark

    FSB7

    Flexible Shaft Type B (7 ft)

    $138.42
    $153.80
  • FSB8 Noark Flexible Shaft Type B (8 ft)
    Noark

    FSB8

    Flexible Shaft Type B (8 ft)

    $143.32
    $159.24

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.