Add the 12V current ratings for all CCTV cameras and connected accessories, accounting for higher draw from features such as infrared illumination, heaters, or pan-tilt functions when applicable. Choose a 12V power supply with an output-current rating above the calculated load, and confirm that its input, protection features, and battery-charging capability match the installation.

Input requirements vary by model, with options for 115/120 VAC, low-voltage AC, or 24 VAC or 24 VDC when using a voltage regulator, so match the supply to the unit’s specified input. Wire the 12V DC output to the CCTV camera or accessory with correct polarity, keep the connected load within the rated current, and follow the terminal, battery, and protection instructions for the selected power supply.

Choose a 12V CCTV power supply with battery backup when cameras or related accessories need to remain powered during temporary AC outages. These power supplies typically include a built-in charger and automatic transfer to a standby battery, helping maintain surveillance while the primary power source is unavailable.

Compare power supplies for filtered, electronically regulated 12V DC output, along with short-circuit, thermal-overload, and overvoltage protection where specified. For systems with backup power, also review battery charging, automatic switchover, low-battery shutdown, and PTC or fused output protection.