Fuse part 5

#Channel2

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Fuse Characteristics
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The action of fuse is based upon the heating effect of current. Larger the current, the more rapidly the fuse will blow and save their circuit and equipment from unnecessary problem. It has #Inverse_time_characteristics (When large current flows, It takes less time to melt than for a small Current). This characteristics helps it to use in overload purpose.

#Selection_of_fuse: • For Short circuit protection, the fuse elements must be with a good margin for temporary overloads.
• Speed of operation- It depends upon how much current flows through it and depends upon the material of fuse element.
The operating time is not fixed, but decreases as current increases(Inverse Time Characteristics)
• SemiConductor devices need a fast blow or ultra fast blow fuse because a small excessive current can damage the device easily. Normally fast blow fuses are the most general purpose fuses.
•  Time delay fuse can continue with a small high current for a while. (It is used in motor)
• The fuse element must not be damaged by minor harmless surges of current and must not oxidise or change its behaviours after use for several years.
• It should withstand the transient surge due to switching in and out.

#Difference_between_fuse_and_CircuitBreaker
¡) fuse - fast operation. (0.001 or 0.002 sec)
   CB - comperatively slow. (0.1 to 0.2 sec)

¡¡) fuse - when it melts, you must change it
    CB- you can reset it, when fault clears totally.

¡¡¡) fuse is cheap and possibly of failure is Nil.
      CB is expensive and a small defect in trip mechanism can damage it fully.
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