The Second Line Of Defense For The Power Supply System: Surge Protectors Should Be Installed On More Important Or Sensitive Electrical Equipment.

The second line of defense should be the surge protective device protection unit installed at the branch distribution equipment supplying power to important or sensitive electrical equipment.

These SPDs (Surge Discharge Devices) provide more effective absorption of residual surge energy after passing through the surge arrester at the user's power supply inlet, offering excellent suppression of transient overvoltages. The surge protector protection unit used here requires a maximum impulse capacity of 40kA/phase or higher, and the limiting voltage should be less than 2000V.

We call this Level 2 surge protection device. For most user power supply systems, Level 2 protection is sufficient to meet the operational requirements of the electrical equipment.