How to choose molded case circuit breaker

Update date:2018-06-06 Source:MAXGE

1. First select the category according to the specific conditions of use, 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 preferred. The rated current is relatively large, and it is better to use the frame type circuit breaker, and it is better to replace those with good performance of the molded case circuit breaker. It should be noted that it is necessary to calculate the current limiting capability of the circuit breaker for branches with large short-circuit currents.

Molded case circuit breaker

2. Secondly determine the type of circuit breaker, determine the parameters, it is to see the cost, it is the key factor in the choice. Generally, the electronic type is more expensive than the thermo-magnetic type. Under the condition that the basic requirements can be met, the circuit breaker must be safe and reliable, and it has good scalability. For example, it can be adjusted to adapt to changes in the load within a certain range. , Add module unit to achieve functional expansion.

Molded case circuit breaker

3. Today's distribution systems require circuit breakers to be able to provide circuit isolation and safety protection in addition to current control and simple short-circuit and overload protection. They are reliable against personal and equipment safety and distribution systems. The sexual aspects have put forward new requirements. Therefore, the development, design and purchase of products also focus on three aspects of personal safety, protection of electrical circuits and equipment, and reliable power supply.

Molded case circuit breaker


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