Through dial switches the circuit breaker can set rated current, tripping time, instantaneous multiple and so on.
2
系统地分析了低压配电线路保护的要求和实施方法，叙述了熔断器和断路器的选型，及其参数的整定；
The paper analyse the requirements and implementation ways for protection of LV distribution line. Type selection and parameter setting of fuse and circuit-breaker are introduced.
3
断路器的短路保护特性不可调，其整定值如表列所示。
Short-circuit protective characteristics of HFB-150 can not be adjusted. Its setting values are listed in the following table.
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