The Smart Access Model SA-1942 Battery Power Supply is a regulated switching battery
backed device providing 12 volts DC. The supply charges a lead acid type battery and
provides power for one (1) Smart Access Door Unit (or a Central Processor) and one (1)
electric locking device. The battery charging section of the supply includes a low voltage
cut-off relay to prevent battery deterioration caused by reducing the battery voltage to
zero. The supply contains input and output fuses and surge protection components.