What is a Circuit Breaker? What is the function of a circuit breaker? How to choose the right circuit breaker in the work? The circuit breaker is what we often call an air switch. Just like a dam that controls the release of water, when the sluice gate is opened, the flow of water is continuous, and when the sluice gate is lowered, it blocks the flow of water.
The circuit breaker is the symbol QF in electricity, and the circuit breaker is the symbol circuit breaker The role of the circuit breaker is to actively block the circuit, protect the power line and the motor, and actively block the circuit when they present severe overload or short circuit and undervoltage to prevent the expansion of the accident. In addition, the circuit breaker has an arc extinguishing device, which can bring a load safety switch!
Air switch can be divided into frame circuit breaker, molded case circuit breaker, mini circuit breaker (also called mini circuit breaker) according to the structure, during which the mini circuit breaker is divided into type B, type C and type d, DZ47-63 represents the type of air switch, DZ stands for Delixi molded case circuit breaker, 47 represents the design code, -63 represents the maximum type of circuit breaker is 63A20/400V, indicating that the rated voltage of the circuit breaker is 230V or 400V.
4000A indicates that the limit breaking current of the air switch is 4000A, in other words, the maximum current that the air switch can accept. If the 4000A is exceeded, the air switch will break down immediately. C-type switches are commonly used in lighting circuits, and this type (C-type) air switch can accept about 5-10 current impulses. To put it simply, when the rated current through the air switch reaches 63A, the air switch will not trip immediately, but will pass through a When the instantaneous current of the air switch reaches 5-10 times of the rated current, that is, 63A*5, the air switch will trip immediately. The purpose of this design is to prevent certain devices from passing high currents when they are activated.
Type B air switch is generally used in transformer, which can accept about 2-3 times of current impact, and type D air switch is generally used for motor power-on, which can accept about 10-20 times of current shock.
For example, a 4kw three-phase asynchronous motor, the rated current is about 7.5A, and the starting current is about 4-7 times the rated current of the motor, which is about 52.5A. If you choose a circuit breaker, you can choose a D16 circuit breaker, which not only satisfies the requirements of starting instantaneous current, but also satisfies the requirements of passing the rated current.
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