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.

  • OT200US03 | ABB 3P Sw 200A Nf 600V Ul98 Side Oper
    ABB

    OT200US03

    3P Sw 200A Nf 600V Ul98 Side Oper

    $1,429.99
    $2,133.02
  • OT200US04 | ABB 4P Sw 200A Nf 600V Ul98 Side Oper
    ABB

    OT200US04

    4P Sw 200A Nf 600V Ul98 Side Oper

    $1,713.69
    $2,324.13
  • OT2500E01 | ABB 1P Sw 2500A Nf Iec
    ABB

    OT2500E01

    1P Sw 2500A Nf Iec

    $12,833.16
    $17,878.52
  • OT2500E02 | ABB 2P Sw 2500A Nf Iec
    ABB

    OT2500E02

    2P Sw 2500A Nf Iec

    $15,209.66
    $21,189.63
  • OT2500E03 ABB Base Mounted Switch Disconnector (3 Pole, 2500 Amps)
    ABB

    OT2500E03

    Base Mounted Switch Disconnector (3 Pole, 2500 Amps)

    $17,899.24
    $40,570.27
  • OT2500E03C | ABB 3P Dbl Thrw Sw 2500A Nf D-D Lh Iec
    ABB

    OT2500E03C

    3P Dbl Thrw Sw 2500A Nf D-D Lh Iec

    $20,438.01
    $50,565.82
  • OT2500E04 | ABB 4P Sw 2500A Nf Iec
    ABB

    OT2500E04

    4P Sw 2500A Nf Iec

    $20,626.33
    $28,736.55
  • OT2500E04-135 | ABB 4P 2500A Nf Sw Iec Dc-20B 1500Vdc
    ABB

    OT2500E04-135

    4P 2500A Nf Sw Iec Dc-20B 1500Vdc

    $21,659.03
    $43,159.87
  • OT250E03 | ABB 3P Sw 250A Nf Iec 690V
    ABB

    OT250E03

    3P Sw 250A Nf Iec 690V

    $788.60
    $1,787.43
  • OT250E03CF | ABB 3P Xfer Sw 250A Nf Fast Trans Iec
    ABB

    OT250E03CF

    3P Xfer Sw 250A Nf Fast Trans Iec

    $2,986.33
    $7,388.50
  • OT250E04 | ABB 4P Sw 250A Nf Iec 690V
    ABB

    OT250E04

    4P Sw 250A Nf Iec 690V

    $699.50
    $995.35
  • OT250E33 | ABB 6P Sw 250A Nf Iec 1000Vdc
    ABB

    OT250E33

    6P Sw 250A Nf Iec 1000Vdc

    $1,178.75
    $2,916.35
  • OT250E33CP | ABB 6P Xfer Sw 250A Nf Open Transition
    ABB

    OT250E33CP

    6P Xfer Sw 250A Nf Open Transition

    $4,788.98
    $11,848.43
  • OT25F3/B50 | ABB 3P 25A Ul508 Nf, Qty1=Pack50
    ABB

    OT25F3/B50

    3P 25A Ul508 Nf, Qty1=Pack50

    $3,422.09
    $5,080.11
  • OT25F3U/B50 | ABB Switch-Disconnector Incl. 50 Pcs
    ABB

    OT25F3U/B50

    Switch-Disconnector Incl. 50 Pcs

    $3,901.08
    $5,292.82
  • OT25F6 | ABB 6P 25A Ul508 Nf Sw
    ABB

    OT25F6

    6P 25A Ul508 Nf Sw

    $193.91
    $287.87
  • OT25F6/B45 | ABB 6P 25A Nf Sw Bulk Pak Qty1=45
    ABB

    OT25F6/B45

    6P 25A Nf Sw Bulk Pak Qty1=45

    $8,726.56
    $10,321.10
  • OT25F8 | ABB 8P 25A Ul508 Nf Sw
    ABB

    OT25F8

    8P 25A Ul508 Nf Sw

    $193.93
    $224.22
  • OT25FT3 | ABB Rotary Disconnect, 480Vac, With
    ABB

    OT25FT3

    Rotary Disconnect, 480Vac, With

    $72.25
    $107.25
  • OT25FT3/B50 | ABB 3P 25A Nf Door Mnt, Bulk Pk 50
    ABB

    OT25FT3/B50

    3P 25A Nf Door Mnt, Bulk Pk 50

    $3,612.30
    $7,069.17
  • OT30F3/B25 | ABB 3P Sw Nf 30A Bulk Pack 25
    ABB

    OT30F3/B25

    3P Sw Nf 30A Bulk Pack 25

    $3,802.31
    $5,644.56
  • OT30F6 | ABB 6P 30A Ul98 Nf Sw
    ABB

    OT30F6

    6P 30A Ul98 Nf Sw

    $373.55
    $846.68
  • OT315E03 | ABB Swsupply Dis 3P 315A Nf Iec
    ABB

    OT315E03

    Swsupply Dis 3P 315A Nf Iec

    $1,357.46
    $1,604.10
  • OT315E04 | ABB 4P Sw 315A Nf Iec
    ABB

    OT315E04

    4P Sw 315A Nf Iec

    $1,628.96
    $1,883.55
  • OT315E33 | ABB 6P Sw 315A Nf Iec 1000Vdc
    ABB

    OT315E33

    6P Sw 315A Nf Iec 1000Vdc

    $1,682.56
    $3,841.13
  • OT315EC03 | ABB 3P Sw 315A Nf Iec Compact
    ABB

    OT315EC03

    3P Sw 315A Nf Iec Compact

    $1,357.46
    $1,908.58
  • OT3200E03 | ABB 3P Sw 3200A Nf 690V Iec
    ABB

    OT3200E03

    3P Sw 3200A Nf 690V Iec

    $19,582.79
    $27,282.60
  • OT3200E03C | ABB 3P Dbl Thrw Sw 3200A Nf D-D Lh Iec
    ABB

    OT3200E03C

    3P Dbl Thrw Sw 3200A Nf D-D Lh Iec

    $44,689.03
    $52,861.60

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.