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fuse

Fuse is an electrical device.it used for purpose of protective our electrical circuit or electrical device against over current or harmful current.
Resistance of Fuse wire :

                                    Fuse has low resistance with comparison to the load resistance of the circuit but has high resistance when compared to the wire of same length. Thus when asked weather a fuse has high resistance or low resistance, we should answer that a fuse has high resistance with low melting point.

How do fuses work?

A fuse is exactly the same. It's a thin piece of wire designed to carry a limited electrical current. If you try to pass a higher current through the wire, it'll heat up so much that it burns or melts. When it melts, it breaks the circuit it's fitted to and stops the current flowing. 

What causes a fuse to trip?

The circuit breaker trips when too much electricity flows through it or when it cannot handle the excess current load. This means that the flow of electricity is cut off to keep your circuits from overheating or causing more damage.

Type of fuse
1) Low voltage fuse
2) High voltage fuse

FUSE CHARACTERISTICS: 
                                      This characteristic of a fuse design refers to how rapidly it responds to various current overloads. Fuse characteristics can be classified into three general categories: very fast-acting, fast-acting, or Slo-Blo® Fuse. The distinguishing feature of Slo-Blo®  fuses is that these fuses have additional thermal inertia designed to tolerate normal initial or start-up overload pulses.

 FUSE CONSTRUCTION: 
                                Internal construction may vary depending on ampere rating. Fuse photos in this catalog show typical construction of a particular ampere rating within the fuse series. 

FUSEHOLDERS: 
                      In many applications, fuses are installed in fuseholders. These fuses and their associated fuseholders are not intended for operation as a  “switch” for  turning  power “on”  and “off “

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