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.

  • OTPXP3S | ABB Sz-3 Base Blank
    ABB

    OTPXP3S

    Sz-3 Base Blank

    $256.10
    $449.30
  • OTS1203-FC | ABB Term Shroud 3P Ot1200U30-Fc Flange
    ABB

    OTS1203-FC

    Term Shroud 3P Ot1200U30-Fc Flange

    $251.10
    $372.76
  • OTS125T1 | ABB Terminal Shroud Ot30/60/100 1-Pole
    ABB

    OTS125T1

    Terminal Shroud Ot30/60/100 1-Pole

    $8.64
    $12.55
  • OTS1600G1L/3 | ABB Terminal Shroud Ot1200
    ABB

    OTS1600G1L/3

    Terminal Shroud Ot1200

    $190.11
    $282.23
  • OTS1600G1L/4 | ABB Terminal Shroud
    ABB

    OTS1600G1L/4

    Terminal Shroud

    $306.05
    $360.37
  • OTS1600G1S/3 | ABB Terminal Shrouds
    ABB

    OTS1600G1S/3

    Terminal Shrouds

    $154.35
    $350.87
  • OTS160G1L3 | ABB Term Shroud For Ot160G_ 3P
    ABB

    OTS160G1L3

    Term Shroud For Ot160G_ 3P

    $39.94
    $51.13
  • OTS2500G1L/3 | ABB Terminal Shroud Ot2000-2500E 3Pcs
    ABB

    OTS2500G1L/3

    Terminal Shroud Ot2000-2500E 3Pcs

    $163.85
    $224.25
  • OTS2500G1L/4 | ABB Terminal Shroud
    ABB

    OTS2500G1L/4

    Terminal Shroud

    $203.83
    $463.83
  • OTS250G1L | ABB Term Shrd For Otdc100...200
    ABB

    OTS250G1L

    Term Shrd For Otdc100...200

    $45.35
    $52.43
  • OTS250G1L/3 | ABB Term Shroud For Ot200 3P Long
    ABB

    OTS250G1L/3

    Term Shroud For Ot200 3P Long

    $43.21
    $64.14
  • OTS250G1L/4 | ABB Term Shroud For Ot200 4P Long
    ABB

    OTS250G1L/4

    Term Shroud For Ot200 4P Long

    $56.18
    $64.95
  • OTS250G1S/3 | ABB Term Shroud For Ot200 3P Short
    ABB

    OTS250G1S/3

    Term Shroud For Ot200 3P Short

    $43.21
    $64.14
  • OTS250G1S/4 | ABB Term Shroud For Ot200 4P Short
    ABB

    OTS250G1S/4

    Term Shroud For Ot200 4P Short

    $61.79
    $119.28
  • OTS4000G1S/3 | ABB Term Shroud Short 3P Ot3200 4000E
    ABB

    OTS4000G1S/3

    Term Shroud Short 3P Ot3200 4000E

    $255.19
    $344.67
  • OTS400G1L/3 | ABB Term Shroud For Ot400 3P Long
    ABB

    OTS400G1L/3

    Term Shroud For Ot400 3P Long

    $97.65
    $144.96
  • OTS400G1L/4 | ABB Term Shroud For Ot400 4P Long
    ABB

    OTS400G1L/4

    Term Shroud For Ot400 4P Long

    $120.98
    $139.88
  • OTS400G1S/3 | ABB Term Shroud For Ot400 3P Short
    ABB

    OTS400G1S/3

    Term Shroud For Ot400 3P Short

    $91.61
    $135.99
  • OTS400G1S/4 | ABB Terminal Shroud
    ABB

    OTS400G1S/4

    Terminal Shroud

    $213.60
    $246.97
  • OTS40T1 | ABB Terminal Shroud Ot16/25/40 1-Pole
    ABB

    OTS40T1

    Terminal Shroud Ot16/25/40 1-Pole

    $3.80
    $5.64
  • OTS40T1/B100 | ABB 1P Term Shrd Ot16-40, Bulk Pk 100
    ABB

    OTS40T1/B100

    1P Term Shrd Ot16-40, Bulk Pk 100

    $345.68
    $787.83
  • OTS40T3 | ABB Treminal Shroud Ot16-40 3P
    ABB

    OTS40T3

    Treminal Shroud Ot16-40 3P

    $7.60
    $11.29
  • OTS40T3/B100 | ABB 1P Term Shrd Ot16-40 3P, Bulk Pk 1
    ABB

    OTS40T3/B100

    1P Term Shrd Ot16-40 3P, Bulk Pk 1

    $691.34
    $1,577.28
  • OTS63T1 | ABB Terminal Shroud Ot45/63 1-Pole
    ABB

    OTS63T1

    Terminal Shroud Ot45/63 1-Pole

    $5.19
    $7.70
  • OTS63T3 | ABB Terminal Shroud
    ABB

    OTS63T3

    Terminal Shroud

    $10.38
    $15.40
  • OTS800G1L/3 | ABB Term Shroud For Ot630
    ABB

    OTS800G1L/3

    Term Shroud For Ot630

    $104.51
    $155.15
  • OTS800G1L/4 | ABB Term Shrouds 4P Ot600/800 Long
    ABB

    OTS800G1L/4

    Term Shrouds 4P Ot600/800 Long

    $146.91
    $333.88
  • OTS800G1S/4 | ABB Term Shrouds 4P Ot600/800 Short
    ABB

    OTS800G1S/4

    Term Shrouds 4P Ot600/800 Short

    $122.30
    $277.63

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.