Why do door release devices such as strikes and magnetic locks require their own power supplies?
Although the amount of current drawn by a strike (typically 150 mA @ 24 VDC) or magnetic lock (125 – 350 mA @ 24 VDC) is not excessive, electrical spikes and surges occur when the device is energized and de-energized. These issues can create interference, which can hamper the performance of other electronic devices connected to the same power supply. Therefore, it is a sound policy that door releases be powered separately from other electronics in the system.
