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Fuses

Fuses protect circuits from overcurrent and prevent hazards such as fires and equipment damage. By melting or ""blowing"" when the current exceeds safe levels, fuses interrupt the flow of electricity. This is why fuses are essential in residential, commercial, and industrial electrical installations. LiveWire Electrical Supply carries a range of fuses, including fast-acting, time-delay, and specialty fuses from Littelfuse, and Mersen, for various applications and operational demands.

Since 2005, LiveWire Electrical Supply has been providing quality parts and fast shipping for in-stock fuses—including hard-to-find items. Need help finding products? For 24/7 sales assistance, call 1-650-692-0700.

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Showing 913–960 of 1273 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.

How do I know what size fuse I need?

To determine the size of a fuse you need, you should consider the electrical circuit’s current requirements and the device or equipment you’re protecting. The best way to find the right size of fuse for your job is to:
Identify the circuit’s maximum current (in amps) by checking the device’s specifications.
Choose a fuse with a current rating slightly higher than the circuit’s maximum current to avoid frequent trips. This is known as the fuse’s “amp rating.”
Ensure the fuse’s voltage rating matches or exceeds the circuit’s voltage.
If you’re uncertain, refer to the device’s documentation for guidance.

What is the life expectancy of a fuse?

Fuses generally do not have a specific “life expectancy” in terms of years. Instead, they are designed to operate reliably until they are subjected to excessive current, which causes them to blow (i.e., open the circuit) and need replacement. The life expectancy of a fuse depends on factors like how frequently it’s subjected to overcurrent conditions and the quality of the fuse. High-quality fuses can withstand more cycles of overcurrent before failing.

How do you tell if a fuse is worn out?

To check if a fuse is worn out or blown, you can follow these steps:
Visually inspect the fuse: Look for a break in the wire inside the fuse. If the wire is intact, the fuse is likely not blown.
Use a multimeter: Set the multimeter to the continuity or resistance setting. Place the test probes on each end of the fuse. If the meter reads low resistance or beeps, the fuse is good; if it reads infinite resistance, the fuse is blown.
Replacement: If you suspect a fuse is blown, replace it with a new one of the same amp rating and voltage. Make sure to disconnect power from the circuit before replacing the fuse.
Remember that fuses are safety devices, and if you’re unsure about their condition or replacement, it’s always a good idea to consult a qualified electrician to ensure the safety of your electrical system.

Shipping and Returns

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

FREE Shipping on orders over $100

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.

Same-Day Shipping

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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LiveWire Electrical Supply PO Box 4221 Burlingame, CA 94011

Normal Business Hours: 7:00am — 5:00pm (Pacific Time)

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