Classification Of Surge Protectors By Working Principle
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According to their working principles, Surge Protectors can be divided into voltage switching type, voltage limiting type and combination type.
(2) Voltage limiting type SPD. When there is no transient overvoltage, it has high impedance, but as the surge current and voltage increase, its impedance will continue to decrease. Its current-voltage characteristics are strongly nonlinear, and it is sometimes called "clamp-type SPD".
(3) Combination type SPD. It is composed of voltage switching type components and voltage limiting type components. It can show the characteristics of voltage switching type or voltage limiting type or both, which depends on the characteristics of the applied voltage.
