1. According to the workplace to meet the requirements of its type and technical parameters;
2. To determine a good breaker in the preliminary varieties and specifications, they still think about it and sit on the lower level of electrical protection coordination characteristics to meet the requirements for selective protection in general;
3. The last to be selected one by one and checking.
Air switch for the main power switch or the branch line protection switching in the power supply of the home. When the line residential or home appliance short circuit or overload, it can automatically trip off the power, so as to effectively protect these devices from damage or prevent the accident.
General household use diodes (ie 2P) as the main power circuit breaker protection, with single-pole (1P) as branch protection. If the circuit breaker rated current selection is small, it is easy to frequent circuit breaker tripped, causing unnecessary power outages, such as the selection is too large, then not achieve the desired protective effect, so the home improvement breaker, the correct choice is the rated capacity of the current size important. General specifications mainly mini circuit breaker at rated current distinguish 6A, 10A, 16A, 20A, 25A, 32A, 40A, 50A, 63A, 80A, 100A and the like.