How can a fuse protect electrical equipment

These devices can detect the faults and trip the circuit immediately before the surge current reaches to the maximum. There are two popular protecting devices used frequently in every electrical circuits. Fuse is operated once in the circuit and then must be replaced after the trip occurs. It is helpful for phase by phase protection. It offers a high breaking capacity at low volume, which limits electro- dynamic stress. Circuit breakers can be reset either manually or automatically.

It automatically breaks the circuit within a short cutoff time and separates the load from the power supply that protects the circuit from any damage. It works faster than a fuse. Vacuum Circuit Breaker. Circuit breakers are available in three types. Systems designers will choose among inverse time trip, adjustable trip or instantaneous trip circuit breakers, depending on the protection sought. Inverse Time Trips:- These breakers trip faster as current increases.

This provides overload protection but also allows equipment and conductors to carry excessive loads briefly. Adjustable Trips :- These breakers are used when the operation of several protection devices in a system must be coordinated. For example, electric motors draw large in-rush currents when they are starting. A typical motor will draw five times as much current while starting compared to its normal running current. Therefore, a motor that draws 3 amps at full-rated load while running, will draw 15 amps while it is starting.

A 12 gauge copper wire used to supply the motor with electricity would normally be protected by a 20 amp fuse or circuit breaker.

The fuse should be rated at a slightly higher current than the device needs:. Circuit breakers act as resettable fuses. These are automatically operated electrical switches that protect electrical circuits from overloading or short circuiting. They detect faults and then stop the flow of electricity.

Give the reaso How does a fuse protect the circuit? Why is an electric fuse required in all electrical appliances? How does the fuse protect circuits and devices? Safety fuse is used to protect our circuit and appliances. Which effect of electric current is us How does electric fuse work?

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