The DC power surge protector is used to prevent damage caused by lightning overvoltage and transient overvoltage to the DC power system and electrical equipment, and to protect the safety of equipment and users. Applicable to all kinds of DC power systems, such as secondary power supply output, DC power distribution screen and various DC power equipment.
It is understood that according to its working principle, SPD can be divided into voltage switch type, voltage limit type and combination type.
(1) Voltage switch type SPD. In the absence of transient overvoltage, it exhibits high impedance. Once it responds to lightning transient overvoltage, its impedance mutates to low impedance, allowing lightning current to pass through, also known as "short-circuit switch type SPD".
(2) Pressure limiting SPD. When there is no transient overvoltage, it is high impedance, but as the surge current and voltage increase, its impedance will continue to decrease, and its current and voltage characteristics are strongly nonlinear, sometimes called "clamped SPD".
(3) Combined SPD. It is a combination of a voltage switching type component and a voltage limiting type component, which can be displayed as a voltage switching type or a voltage limiting type or both, depending on the characteristics of the applied voltage.
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Label: Classification of surge protectors according to working principle
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