GT300系列电力电容器保护器可与切换电容器接触器（晶闸管、复合开关、无功补偿控制器、电抗器、熔断器）等组成电力电容器控制系统。主要作为电力电容器及补偿电路中可能出现的过流、短路、缺相、过压等故障进行保护；保护器作为电力电容器的过流、缺相保护的新型产品。
GT300 series power capacitor protector can be composed of switching capacitor contactor (thyristor, compound switch, reactive power compensation controller, reactor, fuse), etc. the control system of power capacitor. Mainly as the power capacitor and compensation circuit may appear over-current, short-circuit, lack of phase, over-voltage and other faults protection; protector as a power capacitor over-current, phase protection of new products.