Hybrid Solid State Relay SSR Circuit DiagramA solid-state relay () is an ON-OFF control device in which the load current is conducted by one or
more semiconductors – e.g., a power transistor, an SCR, or a . It is an electronic switch, which, unlike an electromechanical relay, contains no moving parts.

The following schematic shows the Hybrid circuit diagram. It composed of a control signal, reed relay, , optional preamplifier, trigger circuit, AC power and load. The control signal is applied (directly, or through a preamplifier) to the coil of a reed relay. The closure of the reed switch then activates appropriate circuitry that triggers the thyristor switch. Clearly, the input-output isolation achieved is that of the reed relay, which is usually excellent.

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