-
Noark
SU20NAA
Control unit, LI protection, Ammeter type (LCD display), 24VDC, for A32/A40 ACB/ADS
$1,068.97$1,187.74 -
Noark
SU20NAA11D
Control unit, 2500A Frame (A25), Drawout type, LI protection, Ammeter type (LCD display), 24-30Vdc
$908.02$1,008.91 -
Noark
SU20NAA11F
Control unit, 2500A Frame (A25), fixed type, LI protection, Ammeter type (LCD display), 24-30Vdc
$908.02$1,008.91 -
Noark
SU20NAC
Control unit, LI protection, Ammeter type (LCD display), 120VAC, for A32/A40 ACB/ADS
$1,068.97$1,187.74 -
Noark
SU20NAC11D
Control unit, 2500A Frame (A25), Drawout type, LI protection, Ammeter type (LCD display), 110-130Vac
$908.02$1,008.91 -
Noark
SU20NAC11F
Control unit, 2500A Frame (A25), fixed type, LI protection, Ammeter type (LCD display), 110-130Vac
$908.02$1,008.91 -
Noark
SU20NAD
Control unit, LI protection, Ammeter type (LCD display), 240VAC, for A32/A40 ACB/ADS
$1,068.97$1,077.00 -
Noark
SU20NAD11D
Control unit, 2500A Frame (A25), Drawout type, LI protection, Ammeter type (LCD display), 200-240Vac
$908.02$1,008.91 -
Noark
SU20NAD11F
Control unit, 2500A Frame (A25), fixed type, LI protection, Ammeter type (LCD display), 200-240Vac
$908.02$1,008.91 -
Noark
SU20NHA11DM
Control unit, 2500A Frame (A25), Withdrawable type, LI protection, 24-30VDC
$1,727.10$1,919.00 -
Noark
SU20NHA11FM
Control unit, 2500A Frame (A25), fixed type, LI protection, 24-30VDC
$1,727.10$1,919.00 -
Noark
SU20NHA12DM
Control unit, 3200/4000A Frame (A32/A40), Withdrawable type, LI protection, 24-30VDC
$1,930.50$2,145.00 -
Noark
SU20NHA12FM
Control unit, 3200/4000A Frame (A32/A40), fixed type, LI protection, 24-30VDC
$1,930.50$2,145.00 -
Noark
SU20NHC11DM
Control unit, 2500A Frame (A25), Withdrawable type, LI protection, 110-130VAC
$1,727.10$1,919.00 -
Noark
SU20NHC11FM
Control unit, 2500A Frame (A25), fixed type, LI protection, 110-130VAC
$1,727.10$1,919.00 -
Noark
SU20NHC12DM
Control unit, 3200/4000A Frame (A32/A40), Withdrawable type, LI protection, 110-130VAC
$1,930.50$2,145.00 -
Noark
SU20NHC12FM
Control unit, 3200/4000A Frame (A32/A40), fixed type, LI protection, 110-130VAC
$1,930.50$2,145.00 -
Noark
SU20NHD11DM
Control unit, 2500A Frame (A25), Withdrawable type, LI protection, 200-240VAC
$1,727.10$1,919.00 -
Noark
SU20NHD11FM
Control unit, 2500A Frame (A25), fixed type, LI protection, 200-240VAC
$1,727.10$1,919.00 -
Noark
SU20NHD12DM
Control unit, 3200/4000A Frame (A32/A40), Withdrawable type, LI protection, 200-240VAC
$1,930.50$2,145.00 -
Noark
SU20NHD12FM
Control unit, 3200/4000A Frame (A32/A40), fixed type, LI protection, 200-240VAC
$1,930.50$2,145.00 -
Noark
SU20NMA
Control unit, LI protection, Basic type (LED display), 24VDC, for A32/A40 ACB/ADS
$747.46$830.51 -
Noark
SU20NMA11D
Control unit, 2500A Frame (A25), Drawout type, LI protection, Basic type (LED display), 24-30Vac
$635.80$706.44 -
Noark
SU20NMA11F
Control unit, 2500A Frame (A25), fixed type, LI protection, Basic type (LED display), 24-30Vac
$635.80$706.44 -
Noark
SU20NMC
Control unit, LI protection, Basic type (LED display), 120VAC, for A32/A40 ACB/ADS
$747.46$830.51 -
Noark
SU20NMC11D
Control unit, 2500A Frame (A25), Drawout type, LI protection, Basic type (LED display), 110-130VAac
$635.80$706.44 -
Noark
SU20NMC11F
Control unit, 2500A Frame (A25), fixed type, LI protection, Basic type (LED display), 110-130Vac
$635.80$706.44 -
Noark
SU20NMD
Control unit, LI protection, Basic type (LED display), 240VAC, for A32/A40 ACB/ADS
$747.46$830.51
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.
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 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.
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.