![]() ![]() These types of fuses are frequently used in electrical and electronics system in houses, industries, consumer products, etc. One Time Only Fuses, when blown out due to over current in the circuit, has to be manually replaced. One Time Only Fuses and Resettable Fuses. The basic classification is the usability i.e. Classification of FusesĮven though the job of a fuse seems simple, there are different methods to classify different types of fuses. Breaking Capacity will specify the maximum safe current that the fuse can interrupt at a voltage less than the maximum rated voltage. ![]() Breaking Capacity of Fuseīreaking Capacity of the Fuse is also known as the Interrupting Rating or Short Circuit Rating. This heat energy is due to current flow and also the arc produced when the fuse is blown. I 2T value of a Fuse measures the heat energy in the fuse. Based on the Voltage Rating, Fuses are again classified in to Low Voltage (LV) Fuses and High Voltage (HV) Fuses (and even miniature fuses). Voltage Rating of FuseĪlong with Current Rating, a fuse will also be specified with the maximum voltage it can be supplied with. This is usually mentioned in Amperes i.e. Current Rating or Current Capacity of FuseĬurrent Rating or the Current Capacity of a Fuse defines the maximum amount of current a fuse can hold without blowing or melting. All the fuses are rated with a maximum voltage that they can be operated with. Till now, we have spoken only about the current ratings of the fuse but haven’t brought up the voltage rating. Even though the element in the fuse melts, there is a chance of arc in the fuse before the current is completely disconnected.ĭuring this period, the fuse must hold the transient voltages and hence, any fuse must be given a clearing time. If there are any inductive components in the circuits, then melting of the conductive element in the fuse is not enough for interrupting the current. This is because, as the current increases, the power dissipation (determined by I2R) will increase and the temperature of the element increases rapidly. Current Rating and Melting Time of the Fuse are generally associated with the Thermal Characteristics of the fuse whereas the Voltage and Interrupting Rating are classified under Interrupting Characteristics of the fuse.Īs the amount of current in the circuit increases, the melting time of the conducting element in the fuse decreases. Interrupting Rating or Breaking capacity.All the fuses are often characterized by the following characteristics. There are different types of Fuses available in the market for different types of applications like residential, industrial, automotive, etc. The following image shows the symbols of fuse along with their standards. For electrical drawings and circuits, there are three symbols of fuses we can use. The following image shows a block diagram of how a fuse is connected in the circuit.įuses are very simple and cheap devices that are being used for over hundred years as a protective equipment. This will disconnect the power supply and thus, the rest of the circuit is protected from being damaged. When the current in the circuit exceeds this permitted value (which may be caused due to overload, short circuit or load mismatch), this excessive current will melt the conductive element in the fuse and opens the circuit. The cross section area of this conducting material is designed such that it allows a certain amount of current that is permitted to flow in the circuit. ![]() A simple fuse consists of a small conductive material with low resistance and it is placed in series with the circuit. The principle of a fuse is based on the heating effect of the electric current. This is because, a fuse scarifies itself and reliably opens the circuit when there is an excessive current in the circuit or the circuit is under over load and if there is any short circuit. Fuses can be considered as a sacrificial element in the circuit as they act as a weak link in the entire circuit. Link Type Cartridge Fuse or High Rupturing Capacity (HRC) FuseĪ Fuse or an Electric Fuse is an Electrical / Electronic device that protects the circuit from different electrical faults like over current and overload.Cartridge Type Fuses or Totally Enclosed Type Fuses.Current Rating or Current Capacity of Fuse. ![]()
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