KCW series intelligent maintenance free electric control system has high reliability, low failure rate, completely maintenance free. Especially suitable for frequent operation, high dust, high temperature (ambient temperature of -40 DEG --75 DEG), vibration working environment. Maintenance free electric control system is composed of intelligent control module and power module replacement contactors and intermediate relays, completely solve the old problem of relay, contactor often burn out. Intelligent control with resin encapsulation structure of integrated module, an inserting plate structure to overcome the problem of bad contact, not afraid, not afraid, not afraid of wet dust vibration, can adapt to the harsh environment operation.