CLASS VIII- FUSE-FUNCTION, TYPES AND IMPORTANCE

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TOPIC

u  FUSE ?

u  TYPE OF FUSE, USE AND THEIR DIAGRAM

u  IMPORTANCE OF FUSE

u  POSSIBLE ACCIDENT WITHOUT A FUSE

 

WHAT IS FUSE AND ITS FUNCTION?

u  A fuse is an electrical safety device which is designed to melt and separate in the event of excessive current.

u  Fuse connected in series with the component(s) to be protected from over current. In case of overcurrent, fuse blows, which make circuit open and therefore no current supply to component(S).

u  Thin piece of fuse wire is contained within a safety sheath to minimize hazards of arc blast, if wire burns open with violent force in case of excess overcurrent.

u  Residential wiring uses screw-in fuse, sheath is transparent

u  Automotive application uses Cartidge type fuse

 

u  Fuse are held by spring metal clips of fuse holder. Fuse holder to be good insulator

u  Overcurrent carries more heat through wire and component(s), which is primarily reacts on fuse wire and melts it down to protect wire and components from getting damage.

 

 

How does a fuse wire works?

u  A fuse is used in circuit to avoid overloading & short circuiting.

u  When a current higher than the rating of fuse flows through it, the fuse wire gets heated and melts.

u  This breaks the circuit and protects the appliances from getting damage.

Properties of fuse wire

u  Low melting point- so that it can break as soon as in case of overcurrent.

u  Low resistivity- so that it doesn’t interfere with the flow of current.

u  Economical- low cost.

u  Least deterioration –longer life

Fuses of different appliances have different current ratings.

u  The appliances which work on large current have fuse of higher current ratings.

u  The appliances which work on small current have fuse of smaller current ratings.

u  For example- current rating of fuse used in fans , lights etc are rated 5A.

u  Another example- current rating of a fuse used in motors are rated 15A.

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