Third-level Surge Protector Protection Design

Third-level protection

The purpose is to provide the ultimate means of protecting equipment by reducing the residual surge voltage to below 1000V, preventing the surge energy from damaging the equipment.

When the surge protective device installed at the AC power input of electronic information equipment serves as the third-level protection, it should be a series voltage-limiting type surge protector with a lightning current capacity of no less than 10kA.

As a final line of defense, a built-in surge protection device can be used within the power supply of the electrical equipment to completely eliminate minor transient overvoltages. The maximum surge capacity of the power surge arrester used here must be 20kA per phase or less, and the required limiting voltage should be less than 1000V. Third-level protection is essential for particularly important or sensitive electronic equipment, and it can also protect the equipment from transient overvoltages generated within the system.

For rectifier power supplies used in microwave communication equipment, mobile station communication equipment, and radar equipment, a DC power surge arrester with an appropriate operating voltage should be selected as the final level of protection, depending on the protection requirements.