H. K. Electric Co.

A Solid State Relay (SSR) is an electronic switching device that switches on or off when a small external voltage is applied across its control terminals. Unlike traditional electromechanical relays (EMRs), SSRs have no moving parts and rely on semiconductor components (like triacs, thyristors, or MOSFETs) to perform switching. This ensures silent operation, fast switching, high durability, and resistance to shock and vibration.