SPD The function of surge protector Lightning arrester

The core function of a surge Protector (SPD) is to quickly discharge transient overvoltages (such as surges caused by lightning strikes or grid fluctuations) in a circuit system, protecting electronic devices from damage while maintaining system stability. ‌

Main function analysis
Transient overvoltage suppression: In the event of transient High voltage caused by lightning strikes or grid operations, surge protectors quickly conduct through nonlinear components such as varistors and gas discharge tubes to limit overvoltage within a safe range.

Surge current discharge: It introduces the huge current generated by lightning or electromagnetic induction into the ground through the grounding system to prevent equipment damage. Power surge protectors typically use multi-stage protection (such as B, C, D levels), with the first stage discharging the main lightning current and the second stage limiting residual voltage.

Double protection type:

Power line protection: installed in the distribution system (220/380V AC system) to protect electrical equipment from power line surges.
Signal line protection: used for communication/control lines (such as networks, telephones, videos) to ensure stable signal transmission of weak current equipment (cameras, switches, etc.) during lightning strikes.
System security enhancement: By implementing graded protection and failure protection mechanisms (automatic disconnection from the power grid+fault indication), the equipment damage rate is reduced, the risk of electric shock is minimized, and data security is ensured.

Typical application scenarios
Family residence: prevent home appliances from being damaged by lightning strikes.
Industrial control: protects sensitive equipment such as PLCs and frequency converters.
Communication base station: Ensure the safety of antenna feeders and network equipment.