Electrical fuse

Electrical fuse

In electrical engineering the fuse is an electrical safety device operated to provide protection to the overload of an electrical circuit. Its essential substance is a metal coil that melts when a large current flows through it, preventing current from malfunctioning or damaging the electrical equipment. This is a very important tool! Once any fuse is running, it is oscillated and there is an open circuit, and this fuse must be replaced or replaced depending on its type.

HRC fuse
HRC fuse


Fuses are a tool used as the necessary safety devices for useful electrical engineering. In today's era, a variety of different fuses are designed, depending on current and voltage ratings, braking capacity, and response time. Considering the timing and current of the fuses, it is chosen to provide complete protection without interruption. The different wiring rules usually define the maximum fuse current rating for a particular circuit. . Short circuits and overloading or device failure are the major causes of fuse operation. When a damaged wire makes contact with a metal that is connected to the ground, a short circuit will form and our fuse will blow.


It is an automatic means of removing a faulty power system by a fuse, it is often a very good means for an ADS (automatic disconnection of supply). The circuit breaker can be used as an alternative to a fuse but has quite different characteristics.


History of fuse


 To protect against lightning attacks, Telegraph stations Berget recommended the use of low-section conductors. This melting of the fuse will protect the equipment and wires placed inside the small wire houses. In the early 1864 telegraph cables and many other types of wire or foil were used to protect lighting installations!

A fuse was patented in 1890 by a man named Thomas Edison as part of the power distribution system.


Manufacture fuse

15 amp replacement which is also called special fuse wire {Israel, 1950}.

 Circuit conductors are elements of a metal or wire fuse of a smaller cross section than a fuse! The electrical terminals are mounted in the middle of a pair! Fuse series to carry the current passing through the shielded circuit. Is arranged. Resistance of any element generates heat due to current flow. In this the shape and construction of the element is determined (empirically) so that the heat generated for the normal current causes the element to achieve higher temperature Do not become. If a large amount of current begins to flow the element rises to a high temperature and either that element melts or melts a solder joint (one) within the fuses which opens the circuit.



The fuse element is made from an alloy between several types of metals such as zinc, copper, silver, aluminum or various other metals that provide stable and predictable characteristics. The fuse would ideally take its rated current indefinitely! And it will melt quickly on its one little spare. Element must not be damaged by minor harmless changes of current! And probably after years of service our behavior should not change. Whenever we increase any heating effect then in this situation the elements can be shaped! In many large fusions, the current can be split between several strips of metal. The two-headed element consists of a long strip of metal that melts immediately on our short circuit. Fuse elements can be supported by steel or nichrome wires so that there is no stress or load on the element!


Due to voltage drop

Any manufacturer producing a fuse can write directions for the voltage drop on the fuse at the rated current. There is a direct relationship between the cold resistance concerning the fuse and its voltage drop value. Once current is produced, the resistance and voltage drop of the fuse will increase continuously with the increase of its operating temperature until the end of the fuse reaches its thermal equilibrium. The voltage drop must be kept in mind when fuses are used in low-voltage applications. In most conventional wire fuses, the voltage drop is often not correct or significant, while the fuse may be important in many other techniques, such as receptive [PPTC] type fuses.


How to mark on fuse


A sample of many marks can be seen on the fuse Yes! Most are marked on the body above the fuses or reflect their rating on those marks. It is very difficult to identify fuses whose surface-mount technology (chip type) fuses have little or no markings.


This type of fuse can have significantly different properties that can be identified by their markings. The marking above the fuse usually clarifies the following information or is marked by the agency for a particular type such as: -

 Current running rating of the fuse.

What is the voltage rating of the fuse.

Characteristic of time and current i.e. speed of fuse.

Approvals given by national and international standards agencies on top of that fuse.

And the name and part number and series of that producer agency.

And above that its interrupting rating (breaking capacity) is also inscribed!


What materials and packages are required to make a fuse?

Different holders for cartridge ferrous fuses: -

Fuses come in a large array of sizes and ranges to function in many applications. They are constructed in standardized package layouts to make them interchangeable in a convenient way. The entire body of the fuse can be made of ceramic, glass, plastic, fiberglass and molded mica laminates or molded compressed fibers depending on the class of application and voltage.

A cartridge or a feral fuse has a cylinder body with its head terminated with a metal. Some cartridge type fuses are constructed with end caps of different sizes to prevent sudden insertion of the wrong fuse rating into a holder giving them the same bottle shape or shape.

For circuits where there is a low power voltage, the fuse may have blades or tag terminals that are secured by screws or screws to the fuse holder. Some single blade-type terminals are made or secured by spring clips. Blade-type fuses mostly require the use of a special purpose ejector tool to pull them out of the fuse holder. Renewable fuses have some fuse elements to replace, allowing the fuse body and terminals to be reused if the fuse does not deteriorate after the operation is over.


 A fuse designed for soldering a circuit board consists of radial or axial wire leads. Surface mount fuses have soldering pads instead of leads. Bahi-type high-voltage fuses have fiber or glass-reinforced plastic tubes and an open end and can be fitted with fuses. Fusible wire can be replaced manually in semi-enclosed fuses, fuse wire. Accurate and accurate fusing currents cannot be properly controlled as fuses and the diameter and material must be used properly when replacing the fuse wire.


Glass fuses have a major advantage because they have a low braking capacity [deprotection rating] that restricts them to applications of 15 V or less to 250 VAC. The advantage of high braking capacity of ceramic fuses and High current in circuits with voltages facilitates their use.


The cooling of the arc by joining a body with sand increases the breaking capacity of the fuse. Medium-voltage fuses may have any liquid-filled envelopes to extinguish the arc. Many types of distribution switchgear use fuse-links immersed in oil filling equipment. A package of fuses may have a pin slot or tab-like feature that prevents interchange of fuses that would otherwise appear.

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