Power supply is a reference to a source of electrical power. A device or system that supplies electrical or other types of energy to an output load or group of loads is called a power supply unit or PSU. The term is most commonly applied to electrical energy supplies, less often to mechanical ones, and rarely to others. Power supplies are commonly used to support security devices that require low voltage power such as electric strikes, electromagnetic locks, keypads and readers, access control systems, CCTV systems, and burglar alarm systems.
Locknetics 510-ULAC-EIR Power supply: Output voltage is field selectable by slide switch. With line power applied, a green LED on the circuit board will be illuminated. This indicates constant power on the output terminals. When batteries are included power may be present on output terminals with the green LED illuminated and on line power present. When line power is present the built-in recharging circuit will keep the batteries charged. Learn More$338.49