Difference Between Fuse and Circuit Breaker

Fuse and circuit breakers are one of the critical components of an electrical system. While both circuit breakers and fuse perform the same job that is to prevent overloads, there are some key differences in the way they function.

What is a Fuse?

We can define fuse as an electrical safety device which removes electrical current from an electrical circuit when the current in the electrical circuit is too high.

What is Circuit Breaker?

We can define a circuit breaker as an automatically operated electrical switch which is designed to protect an electrical circuit from damage caused by an excess amount of current from an overload or short circuit. The basic function of a circuit breaker is to interrupt current flow after a fault is detected.

Fuse vs Circuit Breakers

Fuse Circuit Breaker
Works on the thermal and electrical properties of the conducting materials Works on the switching principle and electromagnetism
It doesn’t give any indication of overloads It gives an indication of overloads
Fuse can only be used once A circuit breaker can be used many numbers of times
Provides protection against power overloads Provides protection against power overloads and short circuits
It detects and interrupts faulty circuit conditions It performs the interruption process only. Faults are detected by a relay system.
Low breaking capacity compared to the circuit breaker High breaking capacity
Automatic operation Can either be automatic or manually operated
Operating time of fuse is 0.002 seconds Operating time of the circuit breaker is 0.02 – 0.05 seconds
Low Cost High Cost