Motorized electric latch retraction (MLR) mortise locksets replace existing mechanical or electrifed mortise locksets for the access control of openings in commercial, industrial and institutional facilities where code compliance, dependable operation and resistance to physical abuse are required. These code compliant electric mortise locksets stay latched even when unlocked, maintaining fire door integrity.SDCs 7600 series motorized latch retraction controlled mortise locksets incorporate a SDC manufactured grade 1 heavy duty mortise lockset and vandal resistant clutch proprietary to all SDC locksets. The motorized latch retraction feature is designed for use on fire rated doors to provide access control and building and fire life safety compliance. Door stays latched even when de-energized. Ideal for automatic door operator applications. All SDC mortise locks feature a keyswitch to manually retract the latch. *Key cylinders sold separately.