These include add-on devices for protection in addition to that afforded by conventional circuit-breaker and fuse systems.
这些防护装置包括附加的保护器件，以增强由常规的电路断路器和保险丝系统所提供的保护。
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.
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 coordination requirements and test methods of short circuit protective device (SCPD) in standard GB14048.4 are introduced. The selection methods of circuit breaker or fuse as SCPD are described.
介绍GB 14 0 4 8 4中与短路保护装置(SCPD)协调配合的要求和试验方法，叙述SCPD为断路器或熔断器时选配方法。
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