The CU-CZ DC Surge Protective Device (SPD) offers crucial lightning and transient overvoltage protection for direct current electrical systems. Compliant with IEC 61643-31 standards, this high-performance SPD safeguards sensitive equipment from damaging surges. Suitable for low-voltage DC systems, including residential PV (photovoltaic) installations and energy storage solutions, the CU-CZ ensures reliable system operation and enhances long-term electrical safety in commercial and industrial DC applications.