What is the role of high voltage circuit breaker QF?

Which of the following is not the role of high-voltage circuit breaker ? ( ) A: Switch on and off various load circuits under normal conditions B: Automatically and quickly switch off the fault current under fault conditions C: Realize the function of automatic reclosing D: Switching voltage level

【单选题】俗称空开(空气开关)实际上学名为_____,文字符号为____。 A. 隔离开关 QS (Disconnected switch) B. 熔断器 FU (Fuses) C. 低压断路器 QF (Low-voltage circuit breaker) D. 热继电器 FR (Thermal relay)