The JYB-M2 and M3 microcomputer integrated motor protectors use PIC microcontrollers produced by the internationally renowned Microchip company as their core components. The product fully adopts digital control and detects current signals through high-precision current transformers; A mathematical model established based on the heating characteristics of electric motors can provide good protection for various faults that may occur in electric motors, such as phase failure starting, locked rotor, grounding, overcurrent, undercurrent, phase failure operation, and low-voltage three-phase imbalance caused by high-voltage side phase failure of power transformers; Multiple functions can be set (overcurrent, undercurrent, leakage current, three-phase imbalance, starting delay, overcurrent protection characteristics, etc.), with high setting accuracy, wide range, and simple operation; The LCD screen displays the operating current of the motor, and an external transformer (5A) is used. The current range includes 1-1000A, of which 200A or less is used as a matching electronic current transformer, and 200A or more is used as an external 5P5 protection level transformer (I/5A). When combined with an AC contactor to form a motor protection system and fault status, it can achieve motor power reclosing (shaking and then tripping). And it has a 4-20mA transmission output or RS485 communication port, which can also accumulate the running time of the motor and achieve star delta conversion control, motor overheating protection. The product adopts the internationally recognized 48 × 96DIN panel installation structure, which is cost-effective and particularly suitable for complete sets of equipment such as drawer cabinets