Switching circuit applies a gate pulse to the TRIAC and the TRIAC starts conducting. The output of the optocoupler is used to operate the switching circuit of TRIAC or transistor. ![]() When the rated voltage is applied to the input section, current flows through the optocoupler. In solid-state relays, the electromagnetic section is replaced by optocoupler and required driver circuits and the output contact section is replaced by a TRIAC or transistor plus snubber and driver circuits. On the other hand, it consists of semiconductor and electronic components within. Unlike electromechanical type, they do not posses any mechanically moving parts. Solid-state relays are commonly known as SSRs. When the input voltage applied to the coil is removed, the armature is brought back to its original position by the spring release. Hence, when the armature is pulled towards the electromagnet, the contact closes. The mechanical contacts are attached to the armature. When an input voltage (almost equal to the rated voltage of the coil) is applied to the coil, it gets magnetized and attracts the armature. ![]() The electromagnet section consists of a set of coil wound over a magnetic core. It consists of two sections: the first is the electromagnet section and the other is the armature and mechanical contacts section. Electromechanical relays transfer signals between its contact through a mechanical motion.
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