The JYB-M1 microcomputer integrated motor protection relay uses the PIC microcontroller produced by the internationally renowned Microchip company as its core component. 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 digital display shows the operating current of the motor. Electronic current transformers are used with a current of 200A or less, and external 5P5 protection level transformers (I/5A) are used with a current range of 1-1000A. Cooperating with AC contactors to form an electric motor protection system, it can achieve motor reclosing (shaking and then tripping). And it has a 4-20mA transmission output port, which can also accumulate the running time of the motor and achieve star delta conversion control. 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.