Signal relays are used to switch low-current circuits in applications like telecommunications, network devices, and security systems. Types include electromechanical relays (durable with moving parts), solid-state relays (fast switching with no wear), latching relays (maintain contact without continuous power), thermal relays (protect from overheating), and reed relays (fast switching with magnetic reeds). Choosing the right relay depends on the specific application and operational needs.
