The G13803NU is a compact, unboxed 12V DC switch-mode power supply module designed for CCTV, access control, and general security applications requiring standby battery support. Delivering a highly regulated 13.8V DC output at up to 3A, it provides full rated current to connected loads while supplying an additional 0.5A for battery charging. The unit features universal mains input (90–264V AC), electronic overload protection, mains transient protection, low ripple output, and LED indicators for mains and fault status. Its modular design supports DIN-rail or lug mounting, making it ideal for installations where flexible integration and reliable power performance are required.