7/6/2023 0 Comments Fuse typesThe main types of fuses are categorized into two broad categories based on the type of circuits they are used in. There are wide variety of fuses available for variety of applications. Hence, the current capacity in the fuse is directly proportional to the operating temperature. When the operating temperature is high, the current capacity will decrease and it melts early. Temperature affects the capacity of Fuses. Fuses are further categorized in to Low Voltage Fuses (LV) and High Voltage Fuses (HV). Hence, fuses are also specified with maximum voltage it can be supplied with. It is because an explosion may take place and might trigger fire if the open circuit voltage is higher than that of the device when fuses open up. Voltage rating for the Fuses are mainly considered for safety reasons for the circuit as well as the environment. I 2T Circuit = I 2T Device Voltage Rating In short, the product of square of the current in the circuit should be less than I 2T value of the device. This is because the power dissipation and the temperature increase rapidly. When the current increases in the circuit, the melting time of the element decreases. Make sure that the circuit’s current is 75% (generally) of your fuse’s current rating.Ĭurrent Circuit = 75% of Current Rating of Fuse I 2T Value of Fuse With this whenever there is a sudden increase of current only the fuses will blow out. Before adopting this technique, one must make sure that circuit components are able to withstand the overload of current before the fuse act its role. This is the current carrying capacity of a fuse measured at normal conditions and temperature. The important parameters that must be considered while selecting suitable Fuses are: This compensates the environment temperature effect because at high temperature the breaking point of fuses decrease.įirst Aid Treatment in Electric Shock - Causes, Sources, Severityįig 2 – Fuse Connected in Series with the Circuit Symbolic Representation of FuseĪs per IEC, IEEE/ANSI standard, it is represented in following symbolic form:įig 3 – Symbolic Representation of a Fuse Features of a Fuse A 75% factor is recommended by the suppliers, which means the circuit current should be only 75% of the fuse current rating. We must always follow a design practice in selecting fuses. Whenever there is an overload in the circuit, this immoderate current melts the element in the fuse and opens the circuit by disconnecting the power supply and thus the circuit is protected from being damaged. It allows the current to flow through them. Its working principle is based on the heating effect of the current.įig 1 – Different Applications Require Different Types of Fusesįuses are always connected in series with the circuit. It is also called as the ‘Sacrificial Device’ in the circuit. Fuse is an electrical safety device (or component) used from the early days of electrical engineering.
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