SSR is a contactless switch compromising of SOLID STATE components,its Feature:ate,hig-reliability,contactless,non-speark,non-pollutant,excellentsulation&
withstanding high voltage(2.5KV), speed switch-over, and can match for digital-circuit. With sealing with fireproof epoxy, so it is of withstanding voltage, moistureproof, antisepsisand aseismatic and so on.
SSR will be conductive when the voltage is zero. And will cut off when the polential is zero, Can get a full sine wave on the load. Therefore the radio interfere from circuit is very little, so can lower the counter electromotive force from the inductancing load(e.g.fan, 3-phase motor etc.) ,and can lower the surge-current when drive the inductancing load(e.g.incandescent lamp)