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.

  • OT630ES04K | ABB 4P Sw 630A Nf Iec Side Operated
    ABB

    OT630ES04K

    4P Sw 630A Nf Iec Side Operated

    $3,329.56
    $3,849.97
  • OT63F3-TX/B50 | ABB SWITCH-DISCONNECTOR INCL.50 PCS
    ABB

    OT63F3-TX/B50

    Switch-Disconnector Incl.50 Pcs

    $4,675.59
    $6,343.97
  • OT63F3/B50 | ABB 3P 60A UL508 NF, QTY1=PACK50
    ABB

    OT63F3/B50

    3P 60A Ul508 Nf, Qty1=Pack50

    $4,752.90
    $7,055.71
  • OT63F3C | ABB CHANGE OVER SWITCH
    ABB

    OT63F3C

    Change Over Switch

    $311.79
    $462.85
  • OT63F4C | ABB 4P XFER SW 60A NF D-D UL508
    ABB

    OT63F4C

    4P Xfer Sw 60A Nf D-D Ul508

    $429.65
    $496.80
  • OT63F4N2 | ABB SWITCH-DISCONNECTOR 63A 4P DIN-RAIL
    ABB

    OT63F4N2

    Switch-Disconnector 63A 4P Din-Rail

    $145.95
    $209.88
  • OT63F8 | ABB SWITCH-DISCONNECTOR
    ABB

    OT63F8

    Switch-Disconnector

    $349.74
    $505.28
  • OT63FT4N2 | ABB Switch-Disconnector
    ABB

    OT63FT4N2

    Switch-Disconnector

    $145.95
    $361.07
  • OT800E03P | ABB 3P Sw 800A Nf Iec 60947-3
    ABB

    OT800E03P

    3P Sw 800A Nf Iec 60947-3

    $4,546.51
    $11,248.57
  • OT800U02 | ABB 2P Sw 800A Nf 600V Ul98
    ABB

    OT800U02

    2P Sw 800A Nf 600V Ul98

    $2,471.58
    $2,922.00
  • OT800U03 | ABB 3P Sw 800A Nf 600V Ul98
    ABB

    OT800U03

    3P Sw 800A Nf 600V Ul98

    $3,992.44
    $5,926.80
  • OT800U03C | ABB 3P Dbl Thrw Sw 800A Nf D-D Lh
    ABB

    OT800U03C

    3P Dbl Thrw Sw 800A Nf D-D Lh

    $8,213.21
    $11,441.63
  • OT800U04 | ABB 800A Nf Sw 4 Pole
    ABB

    OT800U04

    800A Nf Sw 4 Pole

    $4,943.15
    $6,954.40
  • OT800U04C | ABB 4P Dbl Thrw Sw 800A Nf D-D Lh
    ABB

    OT800U04C

    4P Dbl Thrw Sw 800A Nf D-D Lh

    $9,125.80
    $13,206.92
  • OT800U12 | ABB 3P Sw 800A Nf 600V Ul98
    ABB

    OT800U12

    3P Sw 800A Nf 600V Ul98

    $3,992.55
    $4,721.18
  • OT800U21 | ABB 3P Nf 800S Sw
    ABB

    OT800U21

    3P Nf 800S Sw

    $3,992.55
    $9,455.45
  • OT800U30 | ABB 3P Sw 800A Nf 600V Ul98
    ABB

    OT800U30

    3P Sw 800A Nf 600V Ul98

    $4,358.08
    $9,878.00
  • OT800U30-FC | ABB 3P Sw 800A Nf Flange Cable Mech
    ABB

    OT800U30-FC

    3P Sw 800A Nf Flange Cable Mech

    $4,467.73
    $6,632.36
  • OT800U30C | ABB 3P Dbl Thrw Sw 800A Nf D-D Rh
    ABB

    OT800U30C

    3P Dbl Thrw Sw 800A Nf D-D Rh

    $8,212.99
    $12,192.23
  • OT80F3 | ABB 3P 80A Ul508 Nf Sw
    ABB

    OT80F3

    3P 80A Ul508 Nf Sw

    $114.08
    $169.34
  • OT80F3/B50 | ABB 3P 80A Ul508 Nf Sw, Qty1=Pack50
    ABB

    OT80F3/B50

    3P 80A Ul508 Nf Sw, Qty1=Pack50

    $5,703.46
    $8,466.83
  • OT80F3C | ABB 3P 80A Ul508 Manual Xfer Sw
    ABB

    OT80F3C

    3P 80A Ul508 Manual Xfer Sw

    $349.81
    $519.30
  • OT80F4C | ABB 4P 80A Ul508 Manual Xfer Sw
    ABB

    OT80F4C

    4P 80A Ul508 Manual Xfer Sw

    $433.46
    $643.48
  • OT80F8 | ABB Switch-Disconnector
    ABB

    OT80F8

    Switch-Disconnector

    $304.20
    $358.18
  • OT80FD8 | ABB 55A 600Vdc Rated Disc Sw
    ABB

    OT80FD8

    55A 600Vdc Rated Disc Sw

    $380.24
    $448.12
  • OT80FT3 | ABB 3P 80A Ul508 Nf Door Mount Sw
    ABB

    OT80FT3

    3P 80A Ul508 Nf Door Mount Sw

    $117.88
    $174.98
  • OTB1600/6 | ABB Phase Barrier Kit For Ot800U/1200U
    ABB

    OTB1600/6

    Phase Barrier Kit For Ot800U/1200U

    $142.60
    $352.80
  • OTB1600/6C | ABB Phase Barrier For Ot800-2500
    ABB

    OTB1600/6C

    Phase Barrier For Ot800-2500

    $209.94
    $381.07

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.