Match the AC input rating to the available source, such as line voltage, a 16 to 28 VAC low-voltage supply, or a 24 VAC or VDC source. Select a DC output that matches the connected equipment’s voltage and provides enough current, with options including regulated 12 VDC or selectable 6, 12, and 24 VDC outputs.

Fixed-output AC to DC transformers provide one predetermined DC voltage, making them suitable for devices with a specific power requirement. Selectable-output units let the installer choose from multiple supported DC voltages, which can help accommodate different security, access control, CCTV, or accessory devices within one installation.

Choose an enclosed AC to DC transformer when you need a contained power supply or charger for access control, security, or CCTV equipment, including systems with standby batteries. Choose a board-level unit when you are integrating power conversion into an existing enclosure, or a plug-in adapter when a compact indoor power source with a standard AC connection fits the installation.

Add the connected devices’ rated current requirements together, then select an AC to DC transformer with a DC output voltage that matches the devices and a current rating above that total. Allow extra capacity for startup demands, battery charging, or future additions, and confirm that the power supply supports the required protection and installation environment.