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Technical Explanation for Solid-state Relays

Power transistor (for DC loads) Power MOS FET (for AC or DC loads) Thyristor (for AC loads) Triac (for AC loads) Current flows to the input circuits, the photocoupler operates, and an electric signal is transferred to the trigger circuit in the output circuits. When the switching element turns ON, load current flows and the lamp turns ON.

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  Load, Dc load

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