Surge Protection Device
A surge protector is a device that is linked to a system to protect it against overvoltage. It is an electrical protection system component that is used to secure devices in power distribution and transmission systems.
These devices safeguard electronic systems against voltage transients.
Surge Protective Devices (SPDs) are devices that safeguard the system against voltage spikes. It is a catch-all phrase for any protective device designed to defend against overvoltage.