The NJVA1 voltage and current protector is a new type of intelligent protector. The product adopts a modular design, and can adjust the circuit overvoltage, undervoltage, and overcurrent. The protector can quickly cut off the circuit to avoid equipment damage caused by abnormal voltage or current connected to terminal appliances. When the voltage or current returns to normal, the circuit will be automatically connected within the time delay, so as to ensure the normal operation of the terminal under unattended conditions, and the voltage and current values can be displayed at the same time.