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.

  • FSB9 Noark Flexible Shaft Type B (9 ft)
    Noark

    FSB9

    Flexible Shaft Type B (9 ft)

    $120.38
    $166.78
  • FST10 Noark Flexible Shaft for Operating One Breaker or Two Breakers (10 ft)
    Noark

    FST10

    Flexible Shaft for Operating One Breaker or Two Breakers (10 ft)

    $106.65
    $148.26
  • FST4 Noark Flexible Shaft for Operating One Breaker or Two Breakers (4 ft)
    Noark

    FST4

    Flexible Shaft for Operating One Breaker or Two Breakers (4 ft)

    $94.64
    $105.16
  • FST5 Noark Flexible Shaft for Operating One Breaker or Two Breakers (5 ft)
    Noark

    FST5

    Flexible Shaft for Operating One Breaker or Two Breakers (5 ft)

    $101.43
    $112.70
  • FST6 Noark Flexible Shaft for Operating One Breaker or Two Breakers (6 ft)
    Noark

    FST6

    Flexible Shaft for Operating One Breaker or Two Breakers (6 ft)

    $108.21
    $120.23
  • FST7 Noark Flexible Shaft for Operating One Breaker or Two Breakers (7 ft)
    Noark

    FST7

    Flexible Shaft for Operating One Breaker or Two Breakers (7 ft)

    $114.98
    $127.76
  • FST8 Noark Flexible Shaft for Operating One Breaker or Two Breakers (8 ft)
    Noark

    FST8

    Flexible Shaft for Operating One Breaker or Two Breakers (8 ft)

    $96.46
    $133.20
  • FST9 Noark Flexible Shaft for Operating One Breaker or Two Breakers (9 ft)
    Noark

    FST9

    Flexible Shaft for Operating One Breaker or Two Breakers (9 ft)

    $126.66
    $140.73
  • HM1A Noark Handle Operating Mechanism (10x10mm)
    Noark

    HM1A

    Handle Operating Mechanism (10x10mm)

    $26.26
    $36.15
  • HM2HVA Noark Handle Operating Mechanism for M2HV (10×10mm²)
    Noark

    HM2HVA

    Handle Operating Mechanism for M2HV (10×10mm²)

    $61.73
    $68.59
  • HM3B Noark Handle Operating Mechanism (12x12mm)
    Noark

    HM3B

    Handle Operating Mechanism (12x12mm)

    $56.07
    $77.42
  • HM3HVB Noark Handle Operating Mechanism for M3HV (12×12mm²)
    Noark

    HM3HVB

    Handle Operating Mechanism for M3HV (12×12mm²)

    $76.19
    $84.66
  • HM4B Noark Handle Operating Mechanism (12x12mm)
    Noark

    HM4B

    Handle Operating Mechanism (12x12mm)

    $65.09
    $89.73
  • HMD1A Noark Handle Operating Mechanism (10x10mm)
    Noark

    HMD1A

    Handle Operating Mechanism (10x10mm)

    $62.99
  • HMD2A Noark Handle Operating Mechanism (10x10mm)
    Noark

    HMD2A

    Handle Operating Mechanism (10x10mm)

    $38.04
    $42.27
  • IHM1 Noark NFPA 79 Internal Handle Mechanism for M1
    Noark

    IHM1

    NFPA 79 Internal Handle Mechanism for M1

    $52.64
    $58.49
  • IHM2 Noark NFPA 79 Internal Handle Mechanism for M2
    Noark

    IHM2

    NFPA 79 Internal Handle Mechanism for M2

    $59.94
    $66.60
  • IHM3 Noark NFPA 79 Internal Handle Mechanism for M3
    Noark

    IHM3

    NFPA 79 Internal Handle Mechanism for M3

    $110.41
    $122.68
  • IHM4 Noark NFPA 79 Internal Handle Mechanism for M4
    Noark

    IHM4

    NFPA 79 Internal Handle Mechanism for M4

    $103.52
    $144.27
  • K8C048 | ABB Os/Ot 800-1200A Flange Cable 48 Inc
    ABB

    K8C048

    Os/Ot 800-1200A Flange Cable 48 Inc

    $445.01
    $660.63
  • K8C096 | ABB Os/Ot 800-1200A Flange Cable 96 Inc
    ABB

    K8C096

    Os/Ot 800-1200A Flange Cable 96 Inc

    $720.26
    $1,066.05
  • K9FCH | ABB Os/Ot 800-1200A Flange Handle 1/12/
    ABB

    K9FCH

    Os/Ot 800-1200A Flange Handle 1/12/

    $712.20
    $1,057.27
  • KIG-2 | ABB Cable Hub
    ABB

    KIG-2

    Cable Hub

    $369.93
    $649.72
  • KLK21NA Noark Handle Lock UL 489, M1, Off
    Noark

    KLK21NA

    Handle Lock UL 489, M1, Off

    $16.07
  • KLK21NB Noark Handle Lock UL 489, M1, On/Off
    Noark

    KLK21NB

    Handle Lock UL 489, M1, On/Off

    $26.26
    $36.15
  • KLK21NC Noark Handle Lock UL 489, M1, On
    Noark

    KLK21NC

    Handle Lock UL 489, M1, On

    $19.92
  • KLK22NA Noark Handle Lock UL 489, M2, Off
    Noark

    KLK22NA

    Handle Lock UL 489, M2, Off

    $16.07
  • KLK22NB Noark Handle Lock UL 489, M2, On/Off
    Noark

    KLK22NB

    Handle Lock UL 489, M2, On/Off

    $32.54

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.