Principle And Classification Of Surge Protectors

Principle
Power supply surge protective device comes in two types: explosion-proof box and module. Both utilize a varistor with excellent nonlinear characteristics. Under normal circumstances, surge protector is in an extremely high resistance state, with leakage current nearly zero, thus ensuring normal power supply. When a surge overvoltage occurs in the power system, the surge protector immediately switches on within nanoseconds, limiting the overvoltage amplitude to within the safe operating range of the equipment and dissipating the surge energy into the ground. The surge protector then quickly returns to a high resistance state, preventing any disruption to normal power supply.

surge protection device (SPD) Classification

Classification by the characteristics of the nonlinear element used

Voltage-Switching SPD

Common nonlinear elements include spark gaps and gas discharge tubes. These have high current carrying capacity (nominal and maximum current carrying capacity) and are particularly suitable for lightning overvoltage protection in areas susceptible to direct lightning strikes =）