How does a circuit breaker work?
Release time:
2020-09-18
Circuit breakers are an essential circuit device in every household in modern homes. This circuit device is a very good device. Its working principle is that when a short circuit occurs in the home circuit, the magnetic field generated by the large current overcomes the reaction spring, the release pulls the operating mechanism to act, and the switch trips instantaneously. When the current of the home circuit becomes larger and the load is overloaded, the generated heat will rapidly intensify the deformation of the bimetallic sheet to a certain extent to promote the action of the mechanism. The greater the current, the shorter the action time. There are many types of circuit breakers, among which the electronic type uses a transformer to collect the current of each phase, and compares it with the set value. When the current is abnormal, the microprocessor sends a signal to make the electronic breaker drive the operating mechanism to act.
When the main contact of the low-voltage circuit breaker is closed, the free trip mechanism locks the main contact in the closing position, and the main contact of the low-voltage circuit breaker mainly relies on manual operation or electric closing. When the coil of the overcurrent release and the thermal element of the thermal release are connected in series with the main circuit, the coil of the undervoltage release is connected in parallel with the power supply. The armature of the overcurrent release is closed because the circuit has been short-circuited or severely overloaded, and the free release mechanism will act at this time, and the main contact will disconnect the main circuit. When the circuit is overloaded, the thermal element of the thermal release will heat up and bend the bimetal, pushing the free release mechanism to act. When the circuit is under voltage, the release of the armature of the under voltage release can also make the free release mechanism act. The shunt release is used for remote control. During normal operation, the coil is powered off. When distance control is required, press the start button to energize the coil.
The above are some knowledge points about the working principle of the circuit breaker. You can learn more about the circuit breaker device and the working principle of the circuit breaker through the above description.
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