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Fused Disconnects

Fused disconnects combine a manual switch with integral fuse protection to provide circuit isolation and overcurrent protection. Available in fusible configurations such as Class H, K, R, J, and L, they accommodate voltage ratings typically up to 600V AC and current ratings from 30A to 1200A, depending on the model. Fused disconnects are installed in motor control centers, panelboards, and industrial control panels to ensure safe load disconnection and equipment protection during maintenance or overload conditions. Since 2005, LiveWire Electrical Supply has been providing quality parts and fast shipping for in-stock fused disconnects, safety switches, and more—including hard-to-find items. Need help finding products? For 24/7 sales assistance, call 1-650-692-0700.

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Showing 1–48 of 77 results

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Frequently Asked Questions

LiveWire Electrical Supply is your trusted source for hard-to-find electrical supplies, offering a wide selection of circuit breakers, fuses, safety switches, and industrial control products—all ready to ship the same day. With real-time stock and price checks, you can easily find what you need at competitive prices, whether for residential, commercial, or industrial projects. Our experts are available to assist with part identification and technical support, while our expedited shipping options and free UPS Ground shipping on qualifying orders ensure fast delivery. For 24/7 assistance and personalized support, call 1-650-692-0700.

What is the difference between fused and non-fused AC disconnects?

Fused AC disconnects include built-in fuses that provide both circuit isolation and overcurrent protection, automatically interrupting power if current exceeds safe limits. They are used when local overcurrent protection is required, or to protect specific equipment like HVAC units or motors. Non-fused AC disconnects provide manual circuit isolation only and rely on upstream devices for overcurrent protection. These are used when upstream protection is sufficient, but a local disconnecting means is still required by code.

Does NEC require fused disconnects?

The NEC (National Electrical Code) does not universally require fused disconnects — it requires a “disconnecting means” for certain equipment, but whether that disconnect must be fused depends on the application and existing circuit protection. If the equipment already has proper overcurrent protection upstream, a non-fused disconnect is acceptable. However, fused disconnects are required when additional overcurrent protection is necessary at the point of disconnect, such as for certain motor circuits (per Article 430), HVAC units (per Article 440), or equipment with specific manufacturer instructions. Additionally, service entrance disconnects sometimes require fuses if they serve as the first level of overcurrent protection.

Can you use a fused disconnect instead of a breaker?

Yes, a fused disconnect can be used instead of a circuit breaker in certain applications, as long as it meets the required functions of circuit isolation and overcurrent protection. A fused disconnect provides manual disconnection and protection through its integrated fuses, which can satisfy NEC requirements for both a disconnecting means and overcurrent protection. However, unlike a breaker, it does not offer resettable protection — the fuse must be replaced after a fault. Fused disconnects are typically used when high interrupting ratings are needed, when selective coordination is a priority, or when visible blade disconnects are required for safety.

What are the main types of fused disconnects?
  • General-Duty Fused Disconnects
    Rated for light commercial and residential applications. Typically used where the available fault current is lower, such as HVAC systems or light-duty equipment. These comply with UL 98 but have lower interrupting ratings than heavy-duty models.
  • Heavy-Duty Fused Disconnects
    Designed for demanding industrial environments, with higher short-circuit ratings and robust construction. Used in factories, commercial buildings, and high-load motor control centers. Suitable for frequent switching under load and harsh conditions.
  • Service Entrance Rated Fused Disconnects
    Approved for use as the main disconnect at service entrances. Includes provisions for neutral connection and bonding to meet NEC requirements for service equipment.
  • Enclosed Fused Disconnects
    Supplied with factory-installed enclosures for indoor or outdoor use. Available in various NEMA ratings (1, 3R, 4X) for environmental protection in corrosive or wet environments.
  • Double-Throw Fused Disconnects
    Used for applications requiring switching between two power sources, such as generator and utility power configurations. Provides isolation and overcurrent protection for both sources.
  • Motor Circuit Protector (Fused Type)
    Specifically designed for motor circuits, combining short-circuit protection with manual disconnecting capability. Often paired with motor starters for coordinated protection.

Do fused disconnects improve equipment longevity?
Yes, fused disconnects can improve equipment longevity by providing fast, precise overcurrent protection. High-performance fuses within the disconnect limit let-through current and energy during short-circuit events, reducing thermal and mechanical stress on downstream equipment. This minimizes damage to conductors, terminals, and sensitive components like motors, contactors, and control devices. By clearing faults quickly and locally, fused disconnects help prevent cumulative wear from electrical faults and extend the service life of connected equipment.

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We strive to ship out your items within one business day. The shipping process may take up to 5 business days on some occasions. Feel free to contact us if your order is time sensitive. Call 1-650-692-0700 or email sales@livewiresupply.com for help.

Limited Warranty

Warranty Gurantee
LiveWire certifies that every product shipped out of stock, by manufacturers and by fulfillment partners will be free of functional defects for one (1) year. If any part is found with functional defects during the warranty period, LiveWire will send out a replacement item for free. Warranty items must be returned to LiveWire for inspection and must be postmarked within the warranty period.

Contact our support team by emailing support@livewiresupply.com or calling 1-650-692-0700 during normal business hours for help with your warranty claim.

Disclaimer: Livewire Electrical Supply is not affiliated with, authorized by, or acting as a representative for the brands showcased on our platform. Please be aware that products sold by Livewire Electrical Supply do not include the original manufacturer’s warranty. All trademarks, brand names, and logos featured on this website belong to their respective owners. It’s important to note that this website is not endorsed, sanctioned, or approved by any of the manufacturers or trademark holders mentioned.

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