Working principle of mini circuit breaker

With the popularization of modern electronic equipment and the development of power network, small circuit breaker, as an important circuit protection switching equipment, has become the guardian to ensure the safety of the circuit. This article will introduce the working principle of the small circuit breaker, how it is quickly cut off the power in the case of circuit failure, to protect equipment and personal safety.

The working principle of mini circuit breaker is mainly based on overload protection and short circuit protection. First, let's look at overload protection. When the load in the circuit exceeds the rated current that the circuit breaker can withstand, the current will increase sharply, causing wires, plugs and other components to overheat or even short circuit, which may cause fire or damage the equipment. To prevent this from happening, mini circuit breakers are equipped with thermal protection components, such as bimetal sheets or heat release materials. When the current is too large to cause the temperature to rise, these components will sense the temperature change, and quickly make the circuit breaker switch trip, cut off the circuit, to protect the safety of the entire circuit.

Second, let's look at short-circuit protection. A short circuit is an abnormal contact between two or more conductors in a circuit, resulting in a rapid increase in current. This can be caused by damaged wiring, equipment failure, etc. In order to prevent the disaster caused by short circuit, the mini circuit breaker is equipped with magnetic protection components, such as electromagnetic coils. When the current suddenly increases, the magnetic field generated will cause the electromagnetic coil to sense the current change, and through the mechanical mechanism to make the circuit breaker switch trip, cut off the circuit. This can effectively prevent the short-circuit current from further damage to the circuit and equipment, and ensure a safe and reliable power supply.

In addition to overload protection and short circuit protection, small circuit breakers also have other functions, such as ground leakage protection and manual control. Ground leakage protection means that when there is leakage in electrical equipment, the small circuit breaker can detect and cut off the power supply in time to avoid damage to the human body caused by leakage. The manual control function allows the user to manually operate the switch of the circuit breaker when needed for repair, maintenance or daily power outage operations.

In summary, small circuit breaker as an important circuit protection equipment, through overload protection and short circuit protection two mechanisms, can quickly cut off the power supply when the circuit fails, to protect electrical equipment and personal safety. It plays an integral role in modern power supply systems, ensuring a stable and secure supply of electricity. In the future, with the continuous development of science and technology, the function and performance of small circuit breakers will be further improved, bringing more convenience and safety to the power industry.