C.R. LAURENCE PS602RFKL CRL SDC Low Voltage 1 Amp Regulated Power Supply. These CRL SDC Power Supplies are designed to make it easy and cost effective to power electrical locking systems. They provide regulated, filtered, low voltage DC power to interface with locking devices, station controls, and consoles. Emergency Interface Relay (EIR) Modules provide interface with approved fire or other emergency systems. Output voltage at 12 or 24 Volts DC is field selectable. Built-in battery charging systems allow a constant charge of optional standby battery backups. Tan baked enamel, NEMA Grade 1 approved enclosures all have conduit knockouts and key lock hinged covers..