ACSI 1451/1452 Power Supplies with Battery Backup1451/1452 Power Supplies with Battery BackupACSI 1451 and 1452 Power Supplies can be used in the following applications: Provide power/control to exit devices equipped with the ACSI Series 1550-MD Motor Drive Electric Latch Retraction.(See ACSI Series 1500 Electric Exit Device Catalog) Provide power/control to electrified door hardware in applications requiring automatic door operator interface. Provide power for fail safe or fail secure locking devices.Features 1451-1A load capacity 1452-1.75A load capacity UL Listed for US and Canada Filtered/Regulated 12VDC or 24VDC Class 2 rated outputs Fire alarm interface Overload and short circuit protection Automatic switchover to standby battery when AC fails Built-in battery charger Supplied with (2) 12V, 7Ah lead acid batteriesOptions TD Adjustable time delay for 1 second to 60 minutes DN Day/Night mode provides a separate input forretracting one exit device or two exit devicessimultaneously without activating the automatic dooroperator. While the latches are held retracted, the autooperator can be activated independently from adifferent input. AO Automatic Operator Interface