What is the function of a surge arrestor?

The function of a surge arrestor is primarily to limit surge voltages by discharging excess surge current. In electrical systems, sudden increases in voltage—often due to events like lightning strikes or power surges—can pose a significant threat to both the equipment and the integrity of the electrical system. Surge arrestors are designed to protect devices by providing a controlled path for this excess voltage, effectively clamping it to a safer level before it can enter and potentially damage electrical equipment.

This process helps to prevent equipment failure, electrical fires, and ensures that the system remains operational even when transient voltage spikes occur. The surge arrestor works by diverting the surge away from sensitive components, allowing for normal operation when conditions are stable and protecting against the dangerous spikes that can occur during disturbances in the power supply.