A solid-state relay (SSR) is an electronic switching device that switch on or off when a small external voltage applied across its control terminals. SSRs consist of a sensor which responds to an appropriate input (control signal), a solid-state electronic switching device which switches power to the load circuit, and a coupling mechanism to enable the control signal to activate this switch without mechanical parts. The relay may be designed to switch either AC or DC to the load. It serves the same function as an electromechanical relay, but has no moving parts.
Measurement Equipment、Telecommunication Equipment、Industrial Equipment Medical Equipment、Security Equipment Home Electronice Equipmen、 Office Automation Equipment 、Tele-metrical Equipment
Lower cost-of-use，Direct logic operation，Lower power consumption，Higher reliability，Physically smaller，Lower shock and vibration sensitivity，Higher input-to-output isolation， Lower operating voltages