What is the function of a fuse or circuit breaker in a circuit?

Question

What is the purpose of a fuse or circuit breaker in an electrical circuit, and how do they function to protect the system?

Anonymous · Accepted Answer

A fuse is inserted into a circuit to protect the device / circuit from receiving too much current when shorted.

A circuit breaker is the same function. – If a surge of current is evident through a line, the circuit breaker “breaks” the line, opening the flow of current.

A fuse breaks the circuit only once – then has to be replaced.

A circuit breaker is a “switch” that closes and opens the line. – A circuit breaker is usually STRONGER (tolerates more current flow than a fuse.)

Anonymous · Answer

Fuse is a type of sacrificial overcurrent protection device
A circuit breaker is an automatically-operated electrical switch designed to protect an electrical circuit from damage caused by overload or short circuit

Anonymous · Answer

A fuse protects the circuit it is connected to.
A fault on a line (such as a short circuit) can damage the equipment it is connected to (and the lines between). Such damage can be reduced by incorporating a fusible link or circuit breaker. Such a fuse has to be selected such that the rupture point is below the damage point of the connected equipment (and lines).

Anonymous · Answer

a fuse is a device which contains very thing conductor inside.

its function:

if the currrent exceeds more than needed,the fuse breaks ,and avoids the damage.

for example a Fuse rated 0.25A(250mA) ,will break if the current exceeds 250mA.

Antwan Hilpert

What is the function of a fuse or circuit breaker in a circuit?

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