PRINCIPLE OF SOLID STATE RELAY With combining modern micro-electronic with electric power technic , PRINCIPLE OF SOLID STATE RELAY With combining modern micro-electronic with electric power technic , it is a new non-contactor electronic switch in the logic control circuit , similar with electric-magnetic relay, it can switch on or off a circuit under the control of a trigger-signal. CHARACTERISTIC 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) BASIC FEATURES OF SSR It is input signal can be compatible with both of computer terminal and digital logic circuit. Design space 160% face-mount technic. Electric switch-life 6*107 times. Two trigger model: over zero trigger, random trigger. LED indicates work-state. Build in a absorbing circuit of resistor-capacitor. According on request, can be used for 3-phase or can increase scarcity phase protection. Working environment: -20 C-80 C. Acting responding-time:ON