What do you know about the three principles of the circuit breakers?

- Oct 30, 2019-

What do you know about the three principles of the circuit breakers?

As we all know, circuit breaker is the God of household protection. In case of electric leakage, It’s plays the role of power-off protection. It can be divided into two types: miniature circuit breaker and leakage circuit breaker. The normal job is to protect through internal components.

what do you know about the three principles of the circuit breakers

Do you know how they work?

Most leakage circuit breakers are composed of small circuit breakers and leakage accessories. Small circuit breakers only have overload protection and short circuit protection functions, while leakage circuit breakers have more leakage protection functions. How are these three functional principles formed?


Overload protection [thermal trip principle]

When the running current exceeds the rated current, the bimetallic sheet will bend to trigger tripping due to different thermal expansion coefficient and different degree of elongation after heating, and they are pressed together to restrain each other.


Short circuit protection magnetic trip principle

When a strong short-circuit current is generated, a strong magnetic field response will be generated inside the coil, and the moving core will move forward to push the lock catch and trigger the tripping.

Leakage protection

When the zero sequence transformer detects the unbalanced leakage current, it will reflect the information into the integrated block. After analyzing the unbalanced current, the integrated circuit will command the leakage tripper in it to pull in through the magnetic force and trigger the lock action.


In addition to the three working principles of circuit breakers. We need to know specification and quantity are also factors we should consider. JUNON J65-63 series circuit breaker. Various specifications meet the diverse needs of users. Brand guarantee quality reliable. Trusted product, you deserve it!