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.

  • OTM160E3CM24D | ABB Motorized Switch 160A Iec
    ABB

    OTM160E3CM24D

    Motorized Switch 160A Iec

    $3,760.03
    $5,289.47
  • OTM160E4CM230C | ABB 3P 160A Nf Motor C/O, Open Trans
    ABB

    OTM160E4CM230C

    3P 160A Nf Motor C/O, Open Trans

    $6,178.93
    $8,693.38
  • OTM2000E3CM24D | ABB 3P 2000A Xf Motor C/O 24Vdc Iec
    ABB

    OTM2000E3CM24D

    3P 2000A Xf Motor C/O 24Vdc Iec

    $29,080.69
    $42,756.38
  • OTM2000E3M230C | ABB 3P Sw 2000A Nf Motorized Iec
    ABB

    OTM2000E3M230C

    3P Sw 2000A Nf Motorized Iec

    $20,438.01
    $28,474.20
  • OTM250E3WCM110V | ABB Motorized C/O Switch
    ABB

    OTM250E3WCM110V

    Motorized C/O Switch

    $6,352.44
    $19,091.05
  • OTM250E4CM230C | ABB Motorized C/O Switch
    ABB

    OTM250E4CM230C

    Motorized C/O Switch

    $7,877.13
    $9,470.98
  • OTM400E3CM110V | ABB 3P 400A Xf Motor C/O 110Vdc/Ac Iec
    ABB

    OTM400E3CM110V

    3P 400A Xf Motor C/O 110Vdc/Ac Iec

    $8,751.93
    $11,876.32
  • OTM400E3CM24D | ABB 3P 400A Xf Motor C/O 24Vdc Iec
    ABB

    OTM400E3CM24D

    3P 400A Xf Motor C/O 24Vdc Iec

    $8,751.93
    $12,192.22
  • OTM400E4CM110V | ABB 4P 400A Xf Motor C/O 110Vac/Dc Iec
    ABB

    OTM400E4CM110V

    4P 400A Xf Motor C/O 110Vac/Dc Iec

    $9,439.20
    $23,353.60
  • OTM40F3CMA230V | ABB 3P 40A Motorized Xfer Sw Iec
    ABB

    OTM40F3CMA230V

    3P 40A Motorized Xfer Sw Iec

    $1,566.95
    $1,949.78
  • OTM40F3M230V | ABB 3P Sw 40A Nf 690V Iec Motorized
    ABB

    OTM40F3M230V

    3P Sw 40A Nf 690V Iec Motorized

    $1,561.39
    $3,109.83
  • OTM630E3CM110V | ABB 3P Sw 630A Nf Open Trans C/O Sw Iec
    ABB

    OTM630E3CM110V

    3P Sw 630A Nf Open Trans C/O Sw Iec

    $9,850.09
    $24,370.17
  • OTM63F2C21D230C | ABB 2P 63A Nf Auto Xf Iec, Open Trans
    ABB

    OTM63F2C21D230C

    2P 63A Nf Auto Xf Iec, Open Trans

    $3,246.85
    $3,754.30
  • OTM63F3C20D400C | ABB 3P 63A Nf Auto Xf Iec Open Tran Fix
    ABB

    OTM63F3C20D400C

    3P 63A Nf Auto Xf Iec Open Tran Fix

    $2,416.53
    $3,278.00
  • OTM63F3M230V | ABB 3P Sw 63A Nf 690V Iec Motorized
    ABB

    OTM63F3M230V

    3P Sw 63A Nf 690V Iec Motorized

    $1,643.53
    $2,311.12
  • OTM63F4CMA230V | ABB 4P 230V Motorized Changeover Switch
    ABB

    OTM63F4CMA230V

    4P 230V Motorized Changeover Switch

    $1,838.44
    $2,173.03
  • OTM800E3CM230C | ABB 3P Sw 800A Nf Motorized Iec
    ABB

    OTM800E3CM230C

    3P Sw 800A Nf Motorized Iec

    $10,438.73
    $14,542.38
  • OTM80F4CMA230V | ABB 4P 80A Motorized Xfer Sw Iec
    ABB

    OTM80F4CMA230V

    4P 80A Motorized Xfer Sw Iec

    $2,241.60
    $2,774.40
  • OTP63B4M | ABB 4P Sw 80A Nf Ip65 Iec
    ABB

    OTP63B4M

    4P Sw 80A Nf Ip65 Iec

    $397.40
    $459.45
  • OTPD125FP | ABB Det Neu Ot30-125
    ABB

    OTPD125FP

    Det Neu Ot30-125

    $51.34
    $126.98
  • OTPD40FP | ABB Det Neu Ot16-40
    ABB

    OTPD40FP

    Det Neu Ot16-40

    $26.63
    $37.57
  • OTPD60FP | ABB Detachable Neutral Ot30-60F3
    ABB

    OTPD60FP

    Detachable Neutral Ot30-60F3

    $32.84
    $81.25
  • OTPD80FD | ABB Et Neu Ot63-80 Dr Mt
    ABB

    OTPD80FD

    Et Neu Ot63-80 Dr Mt

    $31.11
    $39.77
  • OTPD80FP | ABB Det Neu Ot63-80
    ABB

    OTPD80FP

    Det Neu Ot63-80

    $34.23
    $39.57
  • OTPE125FD | ABB Gnd Term Ot30-125 Dr Mnt
    ABB

    OTPE125FD

    Gnd Term Ot30-125 Dr Mnt

    $47.53
    $68.35
  • OTPE125FP | ABB Gnd Term Ot30-125
    ABB

    OTPE125FP

    Gnd Term Ot30-125

    $47.53
    $117.58
  • OTPE40FD | ABB Gnd Term Ot16-40 Dr Mnt
    ABB

    OTPE40FD

    Gnd Term Ot16-40 Dr Mnt

    $19.01
    $28.22
  • OTPE40FP | ABB Gnd Term Ot16-40
    ABB

    OTPE40FP

    Gnd Term Ot16-40

    $19.01
    $28.22

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.