Abstract: Traditional JDB series motor protector can not meet the AQ1023-2006 general requirements of safety and technical,which serviced for underground coal mine low voltage power supply system and equipments.Cover opening identification circuits were introduced and connected to power network by power line carrier module.The protector was also connected to monitor substation by multifunctional communication module.The multifunctional integrated motor protector has advantage in transmitting cover opening information and locking.