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Class J Fuses

Class J fuses provide overcurrent protection by quickly interrupting excessive electrical flow caused by overloads and short circuits, minimizing the risk of equipment damage and electrical fires. These fuses feature time-delay capabilities to handle inrush currents, making them ideal for protecting motors and transformers. Class J fuses are single-use devices that must be replaced after operation. Discover our selection of Class J fuses for industrial and commercial applications at LiveWire Electrical Supply.
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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.

How do I determine the appropriate Class J fuse for a specific application?

To select the correct Class J fuse, consider the application’s current rating, voltage rating, and time-delay needs. Ensure the fuse rating aligns with the equipment’s protection requirements to prevent nuisance tripping and ensure safety.

What voltage rating do I need for my system?

Class J fuses generally come with a voltage rating of up to 600 volts AC. Ensure that the voltage rating of the fuse is equal to or higher than the system voltage to provide adequate protection.

What interrupting rating should I look for?

The interrupting rating, typically up to 200,000 amperes for Class J fuses, indicates the maximum fault current the fuse can safely interrupt. Choose a fuse with an interrupting rating that exceeds the potential fault current of your system.

Shipping and Returns

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You may return items within 30 days of delivery for a refund. Please view our return policy here.

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We offer one to five-day delivery in the United States. The variation depends on the chosen shipping speed and the warehouse location for the product(s). Please view our shipping policy here.

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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 (650) 777-0060 or email sales@apxpwr.com for help.

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