4 Types of Fuses

Choosing The Right Fuses In Murrieta!

4 Types of FusesTypes of fuses are moving in the direction of increased efficiency, reliability, and safety of the ammunition. The time and current operating characteristics of fuses are chosen to provide adequate protection without needless interruption. Semi-enclosed fuses are fuse wire carriers in which the fusible wire itself can be replaced.

Another advantage of fuses is their high interrupting rating. Overcurrent devices primarily protect the conductors of a circuit from overtemperature damage (and the fire hazards associated with overly hot conductors) and secondarily protect specific pieces of equipment such as loads and generators (some fast-acting fuses are designed to protect electronic devices particularly susceptible to current surges).Fuses are always connected in series with the component(s) to be protected from overcurrent, so that when the fuse blows (opens) it will open the entire circuit and stop current through the component(s).

Fuses 101: What You Need to Know

While circuit breakers are becoming more prominent in 12-volt system design, the fuse remains a common, and useful, technology. If you’re not up on your fuses, here’s an overview of where they fit into automotive circuit protection.

Uses And Types
According to “Fuseology” by Littelfuse, the purpose of a fuse is to serve as a sacrificial device. Inside a fuse is a conductive strip of material that will melt if the fuse overloads, also called its “breaking capacity.” If a system overloads or shorts, the fuse breaks the circuit, or “opens,” to protect the larger system; once a fuse pops it cannot be reused.

In automotive electrical work, the vast majority of fuses are “blade”-type fuses, where the fuse has two prongs that fit into a small plug, however the use of bolt-down fuses and cartridge fuses has gradually increased in popularity over time. See more here.

Fuses are primarily rated in terms of maximum current but are also rated in terms of how much voltage drop they will safely withstand after interrupting a circuit.

What Is A Fuse?

What is a fuse? Simply put, it’s your first line of defense against a short circuit.  When a circuit experiences an excessive amount of current flow, fuses heat up and blow to protect the circuit from damage, such as fires. Usually, fuses are found close to the battery in order to avoid battery damage from a direct short in the cables coming off the posts. Often times you’ll find one larger fuse block closer to the battery, and then have the circuit branch out further away with additional, smaller fuse blocks.

Types of Fuses

Blade Fuses

One of the most common types of fuses are blade fuses, which typically have two flat terminals protruding from the fuse element housing. The housings are colored by amperage according to the industry standards, and indicator fuse style housings appear clear. The clear housing of indicator fuses allows easy visibility to the indicator light showing a fuse is blown.

Bolt Down Fuses

When more amperage is required, bolt-down fuses come into play. Plus, having a bolt-down design allows for easy installation and replacement. MEGA fuses provide the best battery and alternator protection, with their ultra-high current protection. Similar to other fuses, MEGA fuses are an industry standard for high current automotive applications. Available in 100A-500A. BF2 MEGA fuses are now also available, which provide tin-plated contacts and clear housing for identifying blown fuses fast and easy. Check full article here.

The fastest blowing fuses are designed for the most sensitive electrical equipment, where even a short exposure to an overload current could be very damaging.

How to Choose the Right Fuse

Electrical and electronic devices all need some type of protection, which typically comes from fuses. Unlike circuit breakers, a fuse is a one-time protection that must be replaced after serving its purpose. Fuses range from small glass tubes to large main electrical-service equipment. Generally fuses are rated on the voltage they can control, speed of interruption and their size. Listed in the resources is a chart for applying those ratings to your particular application. Identifying a methodical approach is still needed for choosing any type of fuse, whether it is a replacement or for a new application.

Identify the type of voltage that is being protected. Fuses are rated not only by the amount of voltage but whether it is direct current (DC) or alternating current (AC). Some fuses may be dual-rated—able to handle both DC and AC power. These ratings however will be different in the overall power that can be utilized for proper protection. Select a fuse that will fall into the voltage range of that particular circuit
Observe the amperage of the electrical circuit that the fuse will be protecting. Circuits that include motors or fluorescent lighting use wire coil windings. When starting, these coils of wire will have an “in-rush” of current. This in-rush will be greater than the actual power bring used once the device is running. Pick a fuse made for motor-starting or one that has a time-delay rating. Read full article here.

Fuses Can Be Installed As Standard

Types of fuses and it is extremely important to use the correct diameter and material when replacing the fuse wire, and for these reasons, these fuses are slowly falling from favor. Circuit breakers and fuses will audibly “pop” almost immediately if there’s a short or loose wire. Fuses have different characteristics of operating time compared to current, characterized as, according to the time required to respond to an overcurrent condition.

More commonly, types of fuses will be found in some electrical and many electronic appliances to protect them from possible internal faults that may occur and cause large current flows that result in serious damage. Fuses have been used as essential safety devices from the early days of electrical engineering, and today there are thousands of different fuse designs which have specific current and voltage ratings, breaking capacity and response times, depending on the application, call us here: (951) 805-1262.

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