ES1.docx - Name of Laboratory Electrical Safety Lab Subject...

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Exp. 1 - Study of Fuses and Types of Fuses Surabhi Raman 17BE0029 Aim: To study, compare and analyze the role of fuse and various types based on its application To compute the fuse ratings of re-wirable fuses and carry out a suitable experiment to determine the blow-out of the fuse Fuses: Fuse is a device which is used to protect circuits from over current, overload and ensures the protection of the circuit. There are many types of fu ses available in the market, but the function of all these fuses is same. Fuse consists of a low resistance metallic wire enclosed in a non - combustible material. Whenever a short circuit, over current or mismatched load connection occurs, then the thin wire inside the fuse melts because of the heat generated by the heavy current flowing through it. Therefore, it disconnects the power supply from the connected system. In normal operation of the circuit, fuse wire is just a very low resistance component and does not affect the normal operation of the system connected to the power supply. Types of Fuses: There are different types of fuses available in the market and they can be categories on the basis o f different aspects. Fuses are used in AC as well as DC circuits. Name of Laboratory : Electrical Safety Lab Subject Code Name of School : EEE1021 : SELECT Page | 1
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Name of Laboratory : Electrical Safety Lab Subject Code Name of School : EEE1021 : SELECT Page | 2
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Name of Laboratory : Electrical Safety Lab Subject Code Name of School : EEE1021 : SELECT Page | 3
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Different Types of Fuses: Fuses can be divided into two main categories according to the type of input supply voltage. 1. AC fuses 2. DC fuses AC and DC Fuses There is a little difference between AC and DC fuses used in AC and DC systems. In a DC system, when the metallic wire melts because of the heat generated by the over current, then an arc is produced and it is very difficult to extin guish this arc because of constant DC value. In order to minimize the fuse arcing, DC fuse are slightly bigger than an AC fuse which increase the distance between the electrodes to reduce the arc in the fuse. On the other hand, i.e. in the AC system, voltage with 60Hz or 50Hz frequency changes it amplitude from zero to 60 times every second, so arc can be extinct easily as compared to DC. Therefore, AC fuses are little bit small in sizes as compared to DC fuses. Fuses can also be categorized based on one time or multip le operations. 1) One time use only Fuse 2) Resettable Fuses One time use only Fuse One time use fuses contain a metallic wire, which burns out, when an over current, over load or mismatched load connect event occur, user has to manually replace these fuses, switch fuses are cheap and widely used in almost all the electronics and electrical systems. Such types of fuses can be categories on the following basis.
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