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.

  • DPS12N6 Noark Phase barrier for 3200A Frame, A32 ACB draw out type, 6 pcs for 4P - 3200A
    Noark

    DPS12N6

    Phase barrier for 3200A Frame, A32 ACB draw out type, 6 pcs for 4P - 3200A

    $194.56
    $216.18
  • DRP21N Noark DIN Rail Plate for M1, M1, 150A
    Noark

    DRP21N

    DIN Rail Plate for M1, M1, 150A

    $12.62
    $14.02
  • DRP22N Noark DIN Rail Plate for M2, M2, 250A
    Noark

    DRP22N

    DIN Rail Plate for M2, M2, 250A

    $19.02
    $21.13
  • ECCMP-25 | Connector
    Weg

    ECCMP-25

    Connector

    $9.22
    $20.00
  • ECCMP-32 | Connector
    Weg

    ECCMP-32

    Connector

    $9.22
    $20.00
  • ECCMP-C0 | Connector
    Weg

    ECCMP-C0

    Connector

    $9.22
    $20.00
  • ECCMP-C016 | Connector
    Weg

    ECCMP-C016

    Connector

    $9.22
    $20.00
  • ECCMP-C025 | Connector BK
    Weg

    ECCMP-C025

    Connector BK

    $9.22
    $20.00
  • EF11N Noark Position indicator, For 2500A Frame (A25) ACB-Drawout Only
    Noark

    EF11N

    Position indicator, For 2500A Frame (A25) ACB-Drawout Only

    $165.38
    $183.75
  • EF12N Noark Position indicator, For 3200A (A32) ACB-Drawout Only
    Noark

    EF12N

    Position indicator, For 3200A (A32) ACB-Drawout Only

    $214.34
    $238.16
  • EHMCCR | Eaton EG HANDLE MECH RED / YELLOW
    Eaton

    EHMCCR

    EG HANDLE MECH RED / YELLOW

    $208.26
    $347.11
  • EHMCCRI | Eaton EG ROTARY HANDLE MECH WITH INTERLOCK, RED HANDLE
    Eaton

    EHMCCRI

    EG ROTARY HANDLE MECH WITH INTERLOCK, RED HANDLE

    $217.53
    $362.55
  • ELM20 Noark UL489 MCCB Energy-Limiting Maintenance Switch (ELM Switch)
    Noark

    ELM20

    UL489 MCCB Energy-Limiting Maintenance Switch (ELM Switch)

    $372.78
    $414.20
  • EMUG20 | ABB Locking Nuts
    ABB

    EMUG20

    Locking Nuts

    $0.81
    $0.93
  • EOT16U3P3-S1 ABB Type 3R Enclosed Disconnect Switch (16 Amps, 3 Pole, 600 V)
    ABB

    EOT16U3P3-S1

    Type 3R Enclosed Disconnect Switch (16 Amps, 3 Pole, 600 V)

  • EOT540N3PA3-SBA ABB Enclosed Rotary Disconnect (3 Pole, 40 Amps, Metal NEMA Type 3R Rainproof Black Selector handle)
    ABB

    EOT540N3PA3-SBA

    Enclosed Rotary Disconnect (3 Pole, 40 Amps, Metal NEMA Type 3R Rainproof Black Selector handle)

    $282.33
    $444.00
  • EOT540N3PAP-PBA ABB Enclosed Rotary Disconnect Switch (3 Pole, 40A, Plastic, NEMA Type 4/4X, Watertight, Black Pistol handle)
    ABB

    EOT540N3PAP-PBA

    Enclosed Rotary Disconnect Switch (3 Pole, 40A, Plastic, NEMA Type 4/4X, Watertight, Black Pistol handle)

    $298.23
    $469.00
  • EOT60U3S4-P | ABB 3P Sw 60A Nf N4/4X Ss
    ABB

    EOT60U3S4-P

    3P Sw 60A Nf N4/4X Ss

    $1,121.64
    $1,763.93
  • ER53016UD | Eaton Enclosed Rotary Disconnect Switch (16 Amps, 3 Pole, 600VAC)
    Eaton

    ER53016UD

    Enclosed Rotary Disconnect Switch (16 Amps, 3 Pole, 600VAC)

    $512.64
    $1,000.27
  • ER53016UG | Eaton Enclosed rotary disconnect switch (16A, 600V, 3P)
    Eaton

    ER53016UG

    Enclosed rotary disconnect switch (16A, 600V, 3P)

    $418.88
    $817.30
  • ER53016UW | Eaton Enclosed Rotary Disconnect Switch (16 Amps, 3 Pole, 600VAC)
    Eaton

    ER53016UW

    Enclosed Rotary Disconnect Switch (16 Amps, 3 Pole, 600VAC)

    $1,183.04
    $2,308.38
  • ER53016UX | Eaton Enclosed rotary disconnect switch (16 Amps, 3 Pole, 600V AC)
    Eaton

    ER53016UX

    Enclosed rotary disconnect switch (16 Amps, 3 Pole, 600V AC)

    $785.50
    $1,532.68
  • ER53025UD | Eaton Enclosed Rotary Disconnect Switch (25 Amps, 3 Pole, 600VAC)
    Eaton

    ER53025UD

    Enclosed Rotary Disconnect Switch (25 Amps, 3 Pole, 600VAC)

    $536.09
    $1,046.03
  • ER53025UG | Eaton Rotary Disconnect Switch (25 Amps, 3 Pole, 600VAC)
    Eaton

    ER53025UG

    Rotary Disconnect Switch (25 Amps, 3 Pole, 600VAC)

    $386.88
    $754.88
  • ER53025UW | Eaton Enclosed Rotary Disconnect Switch (25 Amps, 3 Pole, 600VAC)
    Eaton

    ER53025UW

    Enclosed Rotary Disconnect Switch (25 Amps, 3 Pole, 600VAC)

    $1,237.39
    $2,414.42

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.