SDC LR100VDK Electric Latch Retraction Kit, 36" - 48" Von Duprin 98/99 and 33/35

The SDC LR100VDK QuietDuo Electric Latch Retraction Kit converts compatible Von Duprin 33A/35A and 98/99 Series exit devices into motorized, access-controlled exit hardware without replacing the existing panic device. Designed for 36-inch to 48-inch door openings, the retrofit kit operates on 24VDC 10% with a 1.5A inrush current and 200mA continuous current draw. Its motorized mechanism retracts the latch and depresses the pushpad for quiet, controlled entry while preserving free mechanical egress. The kit supports integration with access control systems, remote switches, and low-energy automatic door operators.

SDC LR100VDK QuietDuo Electric Latch Retraction Kit for Von Duprin Exit Devices

The SDC LR100VDK QuietDuo Retrofit Electric Latch Retraction Kit provides motorized latch retraction and electrical dogging for compatible Von Duprin 33A, 35A, 98, and 99 Series exit devices. Designed for commercial and institutional access control applications, the kit converts existing mechanical panic hardware into electrically operated exit hardware without requiring complete exit device replacement. When activated by an access control panel, remote switch, or building automation system, the internal motor retracts the exit device latch and draws the pushpad into its depressed position, allowing authorized users to push or pull the door open. The mechanism supports momentary unlocking and sustained latch retraction while maintaining unrestricted mechanical egress from the secured side.

The LR100VDK operates on regulated 24VDC power with a 10% input tolerance and draws approximately 1.5 amps during initial latch retraction and 200 milliamps during continuous operation. Its patented motor-driven design provides quieter operation and lower sustained current consumption than traditional solenoid-operated electric latch retraction mechanisms. The motor retracts the latch and maintains the pushpad in the depressed position while the appropriate electrical control signal remains active. The kit is compatible with properly sized access control power supplies, including the SDC 602RF power supply for single-door applications and 602RFUR1 or 634RF configurations for simultaneous paired-door operation. SDC recommends a regulated, filtered power supply rated for at least 2 amps per kit when using an alternative manufacturer's power source.

The SDC LR100VDK is designed for field installation inside compatible 36-inch to 48-inch Von Duprin exit device rails, including supported rim, surface vertical rod, and concealed vertical rod configurations. Compatible models include 9827, 9927, 9847, 9947, 9857, 9957, 9975, 3327A, 3527A, 3348A, and 3548A, along with additional configurations listed in SDC's official compatibility chart. Installation involves removing the existing mechanical dogging assembly, positioning the electric latch retraction module inside the exit device, and connecting its linkage to the latch retraction rod. The compact, self-contained assembly is housed within the exit device rail, preserving the appearance of the installed hardware. Devices shortened from their original length require verification of available internal clearance; the LR100VDK-EM external-module version is available for smaller openings where the standard assembly cannot fit.

The LR100VDK supports access-controlled commercial entrances, educational facilities, healthcare buildings, office complexes, and high-traffic doors that require quiet electronic unlocking with dependable mechanical exit operation. Its motorized latch retraction design is suitable for integration with card readers, keypad systems, scheduled unlocking controls, and compatible low-energy automatic door operators. The SDC LR100 Series documentation identifies applicable UL 305 panic hardware, UL 10C fire door assembly, ULC-S104, and ANSI/BHMA A156.3 Grade 1 standards, with compliance dependent on the specific listed exit device and installed configuration. Because the kit retrofits existing hardware, installers must verify the device model, fire-rating requirements, available mounting space, and power supply compatibility before installation. The SDC LR100VDK QuietDuo provides a practical solution for modernizing Von Duprin exit devices with electronically controlled latch retraction while retaining existing mechanical hardware and free egress functionality.