More and more people are paying attention to the issue of electrical safety, so after home line renovation, they will install a circuit breaker for the line, because the circuit breaker can protect the safety of the line and also ensure the safety of electricity use. However, many people may not be very familiar with the term "breaking capacity" of the circuit breaker, so today Weikewei Technology will explain the specific definition of the segmented capacity of the circuit breaker.

1、 Introduction to the breaking capacity of circuit breakers

The breaking capacity of a circuit breaker means that when the home current exceeds the maximum current that the circuit breaker can carry, the circuit breaker can automatically identify the safety risks of the line and then cut off the fault current. If the circuit breaker does not have the ability to break, then installing a circuit breaker in the home line will not have any effect. When the line is short circuited or overloaded, very serious consequences will occur.

2、 Is the greater the breaking capacity of the circuit breaker, the better

That's true, because the greater the breaking capacity, the greater the current and voltage that the circuit breaker can carry, which can provide good protection. Therefore, when purchasing a circuit breaker, it is important to pay attention to the breaking capacity.

3、 What size of circuit breaker breaking capacity should an ordinary family choose

You can choose between two specifications, 4.5KA and 6kA, because the rated current that these two specifications can withstand is already sufficient for ordinary household use. If you choose a circuit breaker switch with too large a specification, it will not have a safety protection effect at all.

4、 How is the breaking capacity of a circuit breaker calculated

This needs to be calculated based on the value of the transformer, the rated current, and other data.

For example, if the value of a transformer is 630kva, the impedance is 4%, and the rated current is 903a, then the calculation method for short-circuit current is to divide 1 by 0.04 and multiply it by 903. The result is 22.5ka, which means that when purchasing a circuit breaker, it is necessary to choose a circuit breaker that is greater than 22.5ka.

Reminder: When purchasing a circuit breaker, if you don't know what size to buy斷路器So you can choose based on the power of household appliances.