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Current rating of fuses and MCB's.
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| Submitted: Mon Dec 22 2003
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CURRENT RATING OF FUSES AND MCBS Name of Instructor: Miss. B.S.K. Subasinghe Name : Perera K.N.S. Index No : 020287 Field : ENTC Date of Per. : 10/12/2003 Date of Sub.: 19/12/2003 CALCULATIONS: For the fuse For MCB From graphs drawn, Fusing current for 5A fuse = Tripping current for 2A MCB = RESULTS Fusing Factor Tripping Factor DISCUSSION: Fuses and Miniature Circuit Breakers (MCBs) are used to protect electrical equipment and for the safety of the users. The conditions that require circuit protection are direct shorts, excessive current and excessive heat. When one or more of these conditions occur the above protective devices (connected in series with the supply) are able to disconnect the circuit thus preventing the danger. Fuses Circuit symbol: This provides protection by melting due to the heat produced because of ohmic resistance, when a higher than a rated current flows through it. There are three main types of fuses, Re-wirable fuses These have a thin wire that...
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