Yes, replacing a blown fuse is a quick, inexpensive, and easy fix if you know what caused the issue. However, simply swapping a fuse won't resolve underlying electrical problems if there is an active short circuit or a circuit overload.
You should not dismiss a blown fuse as an inconvenience. It may be a sign that a real fault has developed, giving you the chance to find and fix the problem before any serious damage occurs. Fuses degrade with time and will eventually fail.
THE 80% Rule
For example, if a circuit breaker is rated for 100 amps, it should not be loaded with more than 80 amps of continuous load. This is because the circuit breaker may overheat and fail if it is loaded to its full capacity for extended periods of time.
You might be more familiar with circuit breakers, which trip and can be reset. Fuses do the same basic job, but they work differently. A fuse breaks the circuit entirely and must be replaced. Circuit breakers, on the other hand, can be switched back on.
A blown fuse needs to be repaired as soon as possible. We do not advise trying to change your circuit breakers or fuses yourself, as this can be a dangerous job and may even lead to short circuiting. Instead, enlist the help of a licensed and qualified emergency electrician for any electrical home repairs.
A fuse blows primarily due to overloaded circuits, short circuits, ground faults, arc faults, or the use of an incorrect fuse type. Ensuring proper load management and correct fuse selection can prevent such incidents.
Additionally, fuse panels are notorious fire hazards. Even when installed correctly, if you use the wrong type of fuse when replacing one that's blown, you could experience a dangerous house fire. Always make sure to have your electrical system inspected every 3-5 years and before closing on a new home.
Loss of Power: The most obvious sign is a loss of power in a specific area of your home, like a room or group of outlets. Visually Inspecting the Fuse: In a fuse box, a blown fuse will have a visible break or melted filament within the glass tube.
How long do fuses last? There's debate on exactly how long fuses last, with some manufacturers claiming fuses can last, 20, 30, even 40 years. However, in the auto industry it's recommended to check or consider replacing fuses after 10.
Unlike a circuit breaker, a blown fuse can't be reset. To fix it, you will need to replace the fuse with one of the same amperage rating (more on this below).
No. If the wires are 14 gauge, they are only rated for a 15 amp breaker. If connected to a 20 amp breaker, the wire could potentially melt and cause a fire before the breaker trips.
The NEC 125% rule for continuous loads means that when a branch circuit or feeder supplies a continuous load, the overcurrent device and related circuit design have to account for that load at 125% of the continuous portion, unless a specific 100%-rated assembly exception applies.
It will blow a little sooner than the 13 amp fuse would, but it would still protect the circuit. You do NOT want to go the other way and replace a 10 amp fuse with a 13 amp one. Chances are it wouldn't matter, but it would allow 3 more amps through than specified in the design. Don't do it as a continuing solution.
A blown fuse is a safety mechanism doing its job, it's not usually an emergency. That said, certain signs mean you need to step away from the switchboard immediately.
Coolant Leaks and Overheating
A cracked hose can cause coolant to leak, which reduces the amount available to keep your engine at a safe temperature. If the engine overheats, it can lead to costly damage, including a blown head gasket or warped engine components.
Smartphone Test
You may use the numeric keypad of the phone dialer or its calculator. This keypad acts as a makeshift continuity tester. Hold one end of the fuse between your bare fingers and carefully touch the other end to any numeral. If your phone registers a “click” or beep, the fuse is likely in good condition.
A blown fuse is often visible, with a gap in the wire or a burnt appearance. Frequent Electrical Outages: If you find yourself constantly resetting tripped fuses, it's a clear indication that your electrical system is under strain. This could be due to an overload or a faulty fuse that needs replacing.
The filament must be continuous from one terminal to the other for current to flow. If the filament is broken through, there's melting visible, or there are black or brown burn marks inside or on the outer portion of the fuse, it's an indication the fuse is blown.
Replacing a fuse is a relatively easy, do-it-yourself home task that you can tackle with a little information and some electrical home safety savvy. If your home has a fuse box, the best advice is to plan ahead and become familiar with the electrical panel and with the types of fuses it requires.
This most likely the problem. However there is a way that a blown fuse can still conduct electricity. I have seen fuses that blew from such a high overload that they covered the inside of the fuse with a thin layer of metal. That caused the fuse to act like a metal film resistor.
Potential Warning Signs and Hazards
Call the fire department immediately if you have any of these warning signs: Arcs, sparks or short circuits; Sizzling or buzzing sound; Odors, vague smell of something burning.
Whilst they can start naturally, see Information note - Wildfire, it is estimated that 90% of all wildfires across the globe are caused by humans. About 30% of those are started as a deliberate act of arson, whilst 70% are started accidentally or as a direct result of human carelessness.
Ranges and Stoves. With cooking as the most common cause of house fires in the US, ranges and stoves are at the top of the list for fire-starting appliances. These essential appliances can become hazards mainly due to unattended use.