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.

  • OHY145J12 | ABB Pstl Hdl 12X145Mm Red/Yl
    ABB

    OHY145J12

    Pstl Hdl 12X145Mm Red/Yl

    $77.78
    $115.45
  • OHY175J12 | ABB Pstl Hdl 12X175Mm Red/Yl 3R,12
    ABB

    OHY175J12

    Pstl Hdl 12X175Mm Red/Yl 3R,12

    $86.43
    $128.29
  • OHY80J6 | ABB Handle,Pistol Grip
    ABB

    OHY80J6

    Handle,Pistol Grip

    $77.78
    $115.45
  • OHYS2AJ | ABB Selec Handle Red Yellow N3R 12 6Mm
    ABB

    OHYS2AJ

    Selec Handle Red Yellow N3R 12 6Mm

    $25.93
    $38.48
  • OPY2 | ABB Legend Plate Yellow Oh2
    ABB

    OPY2

    Legend Plate Yellow Oh2

    $6.91
    $17.10
  • OS160GD03 | ABB 160A Fusible Disconnect Switch, Iec
    ABB

    OS160GD03

    160A Fusible Disconnect Switch, Iec

    $816.09
    $943.62
  • OS600J03 ABB Fusible Disconnect Switch (3 Pole, 600 Amps, J Fuse, 600V)
    ABB

    OS600J03

    Fusible Disconnect Switch (3 Pole, 600 Amps, J Fuse, 600V)

    $4,385.03
    $6,509.59
  • OS60GJ30 | ABB 3P Sw 60A J Fuse 600V Ul98
    ABB

    OS60GJ30

    3P Sw 60A J Fuse 600V Ul98

    $439.43
    $652.32
  • OT100F4C | ABB Change-Over Switch
    ABB

    OT100F4C

    Change-Over Switch

    $542.14
    $804.81
  • OT200U03 | ABB Base Mounted Non-Fusible Disconnect Switch, 3 Pole, Front Operated
    ABB

    OT200U03

    Disconnect Switch

    $589.35
    $874.90
  • OT30F3 | ABB 3P 30A Ul98 Nf Sw
    ABB

    OT30F3

    3P 30A Ul98 Nf Sw

    $142.59
    $211.68
  • OT400U40C ABB Manual Change-Over Switch (400A, 4 Pole)
    ABB

    OT400U40C

    Manual Change-Over Switch (400A, 4 Pole)

    $3,374.65
    $4,747.17
  • OT40F8 | ABB Disconnect Switch, 8-P, 40A/600V
    ABB

    OT40F8

    Disconnect Switch, 8-P, 40A/600V

    $269.96
    $364.72
  • OT63F3 | ABB SWITCH
    ABB

    OT63F3

    Switch

    $95.06
    $141.13
  • OTM63F3C21D400C ABB Automatic Transfer Switch (3 Pole 63 Amps, 400V)
    ABB

    OTM63F3C21D400C

    Automatic Transfer Switch (3 Pole 63 Amps, 400V)

    $3,171.13
    $4,150.70
  • OTM63F3CMA230V | ABB 3P 63A Motorized Iec Transfer Sw
    ABB

    OTM63F3CMA230V

    3P 63A Motorized Iec Transfer Sw

    $1,860.44
    $2,308.75
  • OTPL125FP | ABB Emk/Lbrk 4Th-Pole Ot100
    ABB

    OTPL125FP

    Emk/Lbrk 4Th-Pole Ot100

    $51.34
    $73.95
  • OTPS40FPN2 | ABB 4Th-Pole Ot16/25/40, Right Side
    ABB

    OTPS40FPN2

    4Th-Pole Ot16/25/40, Right Side

    $34.23
    $50.81
  • OXP12X166 | ABB Pstl Shaft 6.5 12X166
    ABB

    OXP12X166

    Pstl Shaft 6.5 12X166

    $13.83
    $20.53
  • OXP12X220 | ABB Shaft,For Disconnect
    ABB

    OXP12X220

    Shaft,For Disconnect

    $24.20
    $35.93
  • OZX1 | ABB Ot/Os Shaft Set Screw 10/Bag
    ABB

    OZX1

    Ot/Os Shaft Set Screw 10/Bag

    $21.61
    $53.47
  • PE55GN | Insulated Enclosure
    Weg

    PE55GN

    Insulated Enclosure

    $20.75
    $45.00
  • PE55GN-E | Insulated Enclosure
    Weg

    PE55GN-E

    Insulated Enclosure

    $20.75
    $45.00
  • PHB1N4XS | Eaton Rotary disconnect external front pistol handle
    Eaton

    PHB1N4XS

    Rotary disconnect external front pistol handle

    $120.48
    $342.73
  • PLMP | Weg Manual motor protector
    Weg

    PLMP

    Manual motor protector

    $0.23
    $0.50
  • R5A3025U | Eaton R5 Disconnect
    Eaton

    R5A3025U

    R5 Disconnect

    $70.93
    $201.79
  • R9E3400UDC | Eaton Rotary disconnect switch
    Eaton

    R9E3400UDC

    Rotary disconnect switch

    $1,609.66
    $2,319.14

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.