The NXU-I-II Surge Protective Device (SPD) provides comprehensive protection against direct lightning strikes and transient overvoltages for electrical systems. This integrated SPD offers a single, streamlined solution for both primary and secondary surge defense, capable of diverting substantial lightning impulse currents. With clear visual indicators and replaceable modules for simplified maintenance, this device is an indispensable component for ensuring system continuity and equipment longevity across residential, commercial, and industrial power distribution applications.