The SSR series miniature solid state relays manufactured by Xiamen Yudian adopt a constant current drive circuit typical of relays, with a stable drive current of 5–6mA, ensuring low power consumption and high reliability. Equipped with an optocoupler zero-cross trigger, they feature minimal interference with the power grid and high insulation withstand voltage. The output employs varistors to absorb voltage spikes from the power grid, resulting in low leakage current and long-term reliable operation.