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.

  • OTS125T3 | ABB Terminal Shroud For Ot100-125
    ABB

    OTS125T3

    Terminal Shroud For Ot100-125

    $17.29
    $25.66
  • SHB00N12 | Eaton Rotary disconnect door interlocked external handle
    Eaton

    SHB00N12

    Rotary disconnect door interlocked external handle

    $31.90
    $90.76
  • 0172101 Baco Controls Panel Mount Disconnect Switch with Yellow, Red Padlockable Handle (32 Amps, 3 Pole)
    Baco Controls

    0172101

    Panel Mount Disconnect Switch with Yellow, Red Padlockable Handle (32 Amps, 3 Pole)

    $41.19
    $63.65
  • OXP12X185 | ABB Pstl Shaft 7.3 12X185
    ABB

    OXP12X185

    Pstl Shaft 7.3 12X185

    $20.74
    $30.79
  • R5A3030U Eaton R5 Series Rotary Disconnect Switch (30A, 3P, 600V, Non-fusible)
    Eaton

    R5A3030U

    Rotary Disconnect Switch (30A, 3P, 600V, Non-fusible)

    $82.69
    $235.25
  • R5B3080U Eaton Rotary Disconnect Switch (80 A, Three-pole, 600 V)
    Eaton

    R5B3080U

    Rotary Disconnect Switch (80 A, Three-pole, 600 V)

    $147.55
    $419.79
  • 96-3258-4 Eaton Replacement Aftermarket Pullout Head
    Eaton

    96-3258-4

    Replacement Aftermarket Pullout Head

    $36.23
    $67.39
  • 255889 | Eaton P1-25/I2/SVB-SW/HI11-NA MAIN SW I2/SVB
    Eaton

    255889

    P1-25/I2/SVB-SW/HI11-NA MAIN SW I2/SVB

    $357.05
    $696.67
  • OHZX13 | ABB 316 Ss Hasp For Pistol Hdl
    ABB

    OHZX13

    316 Ss Hasp For Pistol Hdl

    $146.90
    $218.08
  • 172185 Baco Controls 25/32A Junction/Terminal Block
    Baco Controls

    172185

    25/32A Junction/Terminal Block

    $15.11
    $27.21
  • LST65 | Weg Line Power Terminal
    Weg

    LST65

    Line Power Terminal

    $39.19
    $85.00
  • 172165 Baco Controls 32A Neutral Pole
    Baco Controls

    172165

    32A Neutral Pole

    $13.40
    $24.14
  • OHBS3PH | ABB Sel Handle Blk Door Mnt Snap On
    ABB

    OHBS3PH

    Sel Handle Blk Door Mnt Snap On

    $20.74
    $30.79
  • ACBF-11 | Auxiliary Contact Block Front Mounting (250V max)
    Weg

    ACBF-11

    Auxiliary Contact Block Front Mounting (250V max)

    $9.22
    $20.00
  • XTPR020BC1 | Eaton IEC Motor Control (16-20A)
    Eaton

    XTPR020BC1

    Manual motor protector

    $104.01
    $500.06
  • SF200PH10X10 | Eaton Rotary disconnect shaft extension
    Eaton

    SF200PH10X10

    Rotary disconnect shaft extension

    $31.90
    $90.76
  • TS3EV493-IP65 | Baco Controls PR21 ON/OFF Ground Main Switch W/IP65 Protection (20 Amps, 3 Pole)
    Baco Controls

    TS3EV493-IP65

    ON/OFF Ground Main Switch (20 Amps, 3 Pole)

    $141.99
  • 0172001 Baco Controls Panel Mount Disconnect Switch with Yellow and Red Padlockable Handle (25 Amps, 3 Pole)
    Baco Controls

    172001

    Panel Mount Disconnect Switch with Yellow and Red Padlockable Handle (25 Amps, 3 Pole)

    $35.76
    $62.76
  • XTPAXUVR240V60H | Eaton 240V/60Hz Undervoltage Release
    Eaton

    XTPAXUVR240V60H

    240V/60Hz Undervoltage Release

    $52.83
    $213.33
  • 174002 Baco Controls 25A 3P Disc Sw, Panel Mnt, Grey Non-Pad
    Baco Controls

    174002

    25A 3P Disc Sw, Panel Mnt, Grey Non-Pad

    $36.43
    $65.61
  • OTPN125FP | ABB Solid Neu Ot30-125
    ABB

    OTPN125FP

    Solid Neu Ot30-125

    $47.53
    $70.55
  • 0165109LS | Baco Controls Long Shaft Door Interlock Disconnect Switch (32 Amps, 3 Pole)
    Baco Controls

    0165109LS

    Long Shaft Door Interlock (32 Amps, 3 Pole)

    $119.99
  • FTBBS | Connector
    Weg

    FTBBS

    Connector

    $16.14
    $35.00
  • MPW18-3-U010 (6.3-10 A)
    Weg

    MPW18-3-U010

    MPW18-3-U010 (6.3-10 A)

    $57.63
    $125.00
  • 0165009LS | Baco Controls Long Shaft Door Interlock Disconnect Switch (25 Amps, 3 Pole)
    Baco Controls

    0165009LS

    Long Shaft Door Interlock (25 Amps, 3 Pole)

    $54.46
    $84.16
  • OHB65J6 | ABB Pistol Handle 6X65Mm Black
    ABB

    OHB65J6

    Pistol Handle 6X65Mm Black

    $69.14
    $102.63
  • OHB65L6 | ABB Pistol Handle 6X65Mm Black
    ABB

    OHB65L6

    Pistol Handle 6X65Mm Black

    $103.70
    $153.95
  • SF320SH5X5 | Eaton Rotary Disconnect Shaft extension for External Handle
    Eaton

    SF320SH5X5

    Rotary Disconnect Shaft Extension for External Handle

    $30.13
    $85.69

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.