Installation of emergency power-off protection circuit in electrical and electronic experimental device.

In electrical and electronic experiments, 380 V voltage level of high-voltage experiments account for a considerable proportion, and the safety of experiments must be taken into account to prevent accidents before they occur. It is an effective and necessary way to install the emergency power-off protection circuit for electrical and electronic experimental device. The design scheme chooses emergency stop button, AC contactor and air switch with leakage protection. Users press the emergency stop switch to energize the electromagnetic coil of AC contactor. The mechanical action produced by the electromagnetic coil drives the contact to be connected, the phase line L1 generates the leakage through resistance grounding, and the leakage protector cuts off the power supply. The actual utilization is safe and stable, and the effect is good. [ABSTRACT FROM AUTHOR]