How to choose a molded case circuit breaker

The choice of Moulded Case Circuit Breaker is still very particular. We need to confirm the type of circuit breaker for the conditions of use, and finally the function of the molded case circuit breaker. The current circuit breaker function needs to provide isolation and safety protection functions.

1. First select the category according to the specific use conditions, and then determine the specific parameters according to the rated current of the circuit and the requirements for protection. When the rated current is below 630A, the short-circuit current is not too large, and the molded case circuit breaker is the first choice. Rated current is relatively large, it is better to use frame type circuit breakers, and it is better to replace them with those with good performance. It should be noted that for branches with large short-circuit currents, it is necessary to calculate whether the current limiting capability of the circuit breaker can meet the requirements. The circuit breaker should have this function when there is a leakage protection requirement.

2. Secondly, determine the type of circuit breaker and determine the parameters, which is to look at the price/performance ratio, which is the key factor for selection. Under the condition that it can meet the basic requirements, the circuit breaker should be safe and reliable, and it is good to have a certain degree of scalability. For example, it can be adjusted to adapt to changes in the future load within a certain range, and modular units can be installed to achieve functional expansion.

3. The current power distribution system requires circuit breakers to provide isolation and safety protection functions in addition to switching current to achieve circuit control and simple short-circuit and overload protection. It is aimed at the reliability of personal, equipment safety and power distribution systems. Sexuality has put forward new requirements. Therefore, the development, design and purchase of products also focus on three aspects: personal safety, protection of electrical circuits and equipment, and reliable power supply.

I believe that through the above three methods, you can choose a better choice when choosing a molded case circuit breaker.

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