Intelligent controller is one of the core components of the circit breaker, Properties of the intelligent controller a. protective functions of over-load long time-delay and inverse time limit, short tim-delay and inverse time limit, short time-delay definite time limit; instantaneous opercotion pretedion; b. Single-phase grounding failure protection; c. Display of setting current lr and operational current; d. Ampere meter; e. Over-load alarm; f. Short-circuit alarm; g. Testing of operation properties Note: The breakers with telecommunication port are available to realize remote control to breaker through master computer.