RS5426

These components are very high impedance (virtually open circuit) in the normal state with a typical capacitance of 1pF between electrodes. When a voltage spike appears, they arc over and present a relatively low impedance in this condition effectively quenching the spike. They are not recommended to be fitted across mains circuits as the low source impedance of the mains could destroy these device after the fault spike has cleared. They are a well proven and reliable.