A solid-state relay (SSR) is just what it sounds like; an IC that acts like a mechanical relay . They allow you to control high-voltage AC loads from lower voltage DC control circuitry. They accomplish this by using infrared light as the ‘contract,’ a solid-state relay is really just an IR LED and a photometric sealed up into a little box. A Solid State Relay is similar to a mechanic relay where it can be controlled through a digital signal. Solid State Relay generates no noise and has a much longer lifespan compared to the traditional mechanic relay. Features: High-performance/low-cost circuit design. A logic is compatible with the current regulated input. 2500 Vrms optical isolation. Both “Zero Voltage” & phase controllable “Random Switching” versions. High voltage (1200 Vpk) versions for 480 Vrms service. LED indication for control input. Control voltage range:24-600VAC ~ 70-250VAC Specification: Type: SSR-H2-200AA Input: 70-280VAC Load: 24-600VAC Brand: Tense Package Includes: 1 x Solid State Relay SSR-H2-200AA