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.

  • OT200U30 | ABB 3P Sw 200A Nf Ul98 Rh
    ABB

    OT200U30

    3P Sw 200A Nf Ul98 Rh

    $589.35
    $874.90
  • OT25F3 | ABB Switch 3P 25A Ul508 Nf 6Mm
    ABB

    OT25F3

    Switch 3P 25A Ul508 Nf 6Mm

    $68.44
    $101.60
  • OT30F3C | ABB 3P 30A Ul98 Manual Xfer Sw
    ABB

    OT30F3C

    3P 30A Ul98 Manual Xfer Sw

    $406.85
    $603.97
  • OT400U03 | ABB 400A 3-P Nf Disc Switch 600V
    ABB

    OT400U03

    400A 3-P Nf Disc Switch 600V

    $1,349.81
    $2,003.81
  • OT63F3U | ABB 3P SW 60A UL508 NF MTL COLLAR
    ABB

    OT63F3U

    3P Sw 60A Ul508 Nf Mtl Collar

    $127.38
    $189.09
  • OZXA-100/3 | ABB Term Lug Kit 3 Lugs For Eoh_361...3
    ABB

    OZXA-100/3

    Term Lug Kit 3 Lugs For Eoh_361...3

  • OZXA-400/3 | ABB Ot/Os400 Lug Kit 2-600, 3 Lugs
    ABB

    OZXA-400/3

    Ot/Os400 Lug Kit 2-600, 3 Lugs

    $81.53
    $121.02
  • R9J3060FJ | Eaton Rotary disconnect switch (60A, 3P)
    Eaton

    R9J3060FJ

    Rotary disconnect switch (60A, 3P)

    $433.41
    $1,233.05
  • SHB00N4X | Eaton Rotary disconnect door interlocked external handle
    Eaton

    SHB00N4X

    Rotary disconnect door interlocked external handle

    $41.34
    $117.62
  • TSR9L3 | Eaton Rotary Disconnect
    Eaton

    TSR9L3

    Rotary Disconnect

    $134.03
    $381.28
  • XTPR001BC1 Eaton Manual Motor Protector (1A, 45 mm, Class 10)
    Eaton

    XTPR001BC1

    IEC Motor Control (0.63-1A)

    $87.29
    $419.63
  • 172179 Baco Controls 10A NC/NO Auxiliary Contact Block
    Baco Controls

    172179

    10A NC/NO Auxiliary Contact Block

    $8.99
    $16.18
  • 174249 Baco Controls Cone Kit for Door Interlock
    Baco Controls

    174249

    Cone Kit for Door Interlock

    $3.10
    $5.60
  • CSDP Weg Plastic Cap Without Seal Ring
    Weg

    CSDP

    Plastic Cap Without Seal Ring

    $4.03
    $10.00
  • DHR9 | Eaton Direct Handle for R9-type Rotary Disconnects
    Eaton

    DHR9

    Direct Handle for R9-type Rotary Disconnects

    $16.83
    $47.87
  • DMK | Rotary disconnect replacement key
    Eaton

    DMK

    Rotary disconnect replacement key

    $22.46
    $63.89
  • ELM10 Noark Energy Limiting Maintenance Switch (A25/A32/A40)
    Noark

    ELM10

    Energy Limiting Maintenance Switch (A25/A32/A40)

    $402.55
    $447.28
  • FST3 Noark Flexible Shaft for Operating One Breaker or Two Breakers (3 ft)
    Noark

    FST3

    Flexible Shaft for Operating One Breaker or Two Breakers (3 ft)

    $88.06
    $97.84
  • K8C072 | ABB Os/Ot 800-1200A Flange Cable 72 Inc
    ABB

    K8C072

    Os/Ot 800-1200A Flange Cable 72 Inc

    $600.15
    $890.93
  • LK3R9DL | Eaton Rotary disconnect line and load terminal lugs
    Eaton

    LK3R9DL

    Rotary disconnect line and load terminal lugs

    $45.63
    $129.81
  • LPE55GN-E | Insulated Enclosure
    Weg

    LPE55GN-E

    Insulated Enclosure

    $25.36
    $55.00
  • MPW100-3-U100 Weg Motor Protector (100A, 3P)
    Weg

    MPW100-3-U100

    Motor Protector (100A, 3P)

    $331.92
    $720.00
  • MPW18-3-D016 | Weg Motor Protector (1 - 1.6 Amps)
    Weg

    MPW18-3-D016

    Motor Protector (1 - 1.6 Amps)

    $48.41
    $105.00
  • MPW40-3-C063 (.40-.63 A)
    Weg

    MPW40-3-C063

    MPW40-3-C063 (.40-.63 A)

    $63.16
    $137.00
  • MPW40-3-U025 (20-25 A)
    Weg

    MPW40-3-U025

    MPW40-3-U025 (20-25 A)

    $89.90
    $195.00
  • MSW HS 300-40
    Weg

    MSW HS 300-40

    Shaft for Rotary Handle

    $7.46
    $17.00

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.