Transformer-Coupled SSR Circuit Diagram The following schematic shows the Transformer-Coupled Solid State Relay (SSR) Circuit Diagram in which the control signal is applied (through a DC-AC converter, if it is DC, or directly, if It is AC) to the primary of a small, low-power transformer, and the secondary voltage that results from the primary excitation is used (with or without rectification, amplification, or other modification) to trigger the thyristor switch.

In this type, the degree of input-output isolation depends on the design of the transformer. This Transformer-Coupled SSR circuit diagram design consists of: isolating transformer, DC-AC converter, trigger circuit, TRIAC, AC power, load, and control.

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