选择性：继电器对诸如系统瞬间切换或负载突变之类的无害的异常情况不作反应。
Selectivity: The relay must not respond to abnormal, but harmless, system conditions such as switching transients or sudden changes in load.
选择性：继电器对诸如系统瞬间切换或负载突变之类的无害的异常情况不作反应。
Selectivity: The relay must not respond to abnormal, but harmless, system conditions such as switching transients or sudden changes in load.
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