Our decoupling devices are manufactured with advanced solid-state technology and metal casings, capable of safely and effectively controlling the impact of AC stray currents or lightning surges on buried pipelines, thus extending the pipeline's lifespan. Additionally, they prevent the hazards posed by stray currents accumulating on pipelines to humans and the interference to communication lines. The Solid-State Decoupler (SSD) series continues DEI's tradition of providing innovative corrosion prevention products for the industry. It employs the solid-state technology independently developed by DEI. Due to its lightweight nature and non-metallic housing, the SSD is widely used in cathodic protection systems. As a DC isolation and AC coupling device, the SSD is used to prevent cathodic protection currents from reaching predetermined threshold voltages while also conducting induced AC currents. When the voltage exceeds the threshold voltage, the SSD immediately switches to short-circuit mode to provide overvoltage protection. Once the overvoltage subsides, it automatically returns to the DC isolation mode. This operation can be repeated numerous times, typically due to AC fault currents or lightning surges. The SSD's standard threshold voltage is -2V/+2V. The threshold voltage can be either RMS or peak voltage, at which the switching occurs, representing the sum of the DC current and AC peak voltage across the isolator. This ensures a very low and safe clamping voltage across the SSD terminals.