SDC Quiet Duo LR100CRK 24V Latch Retraction / Dogging Kit For Corbin Russwin Exit Devices

The SDC QuietDuo LR100CRK is a 24VDC field-installable electric latch retraction (EL) and dogging retrofit kit specifically engineered for Corbin Russwin Devices ED5000 Series exit devices. The full part number breaks down as: LR (Latch Retraction), 100 (QuietDuo platform), CRK (Corbin Russwin Kit). The kit electrifies a previously mechanical Corbin Russwin ED5200 rim, ED5400 surface vertical rod, ED5600 mortise, or ED5800 concealed vertical rod exit device, allowing the latch to retract via electric signal from an access control panel for hands-free unlocked passage and remote dogging during specified hours. SDC's QuietDuo technology uses a low-noise dual-solenoid actuation that eliminates the audible buzz typical of older latch retraction kits, which is critical in healthcare, education, and corporate environments where acoustic disturbance is a spec concern. SKU LR100CRK. In stock under SDC Exit Devices within Panic Exit Devices in Exit Hardware.

Electric Latch Retraction (EL) vs Request to Exit (RX): Why It Matters

This is the most-misordered electrified exit hardware decision. Electric Latch Retraction (EL) physically pulls the latchbolt open via solenoid when energized, allowing hands-free passage without pressing the push bar. Use EL on access-controlled doors that need to auto-unlock during business hours, ADA-accessible openings, automated entries, and any opening where the latch must mechanically retract on signal from a card reader, keypad, or scheduled time event. Request to Exit (RX) is a switch that signals the access control panel when the inside push bar is pressed; it does not physically operate the latch and serves only to suppress the door-forced-open alarm during legitimate egress. EL and RX serve completely different functions and are commonly specified together (EL for outside auto-unlock, RX for inside egress signaling). The LR100CRK is the EL retrofit; for RX-only switches see Corbin Russwin's RX option on the original exit device. Verify your access control sequence requires latch retraction before ordering EL hardware.

Why QuietDuo Matters in Acoustic-Sensitive Specifications

Standard latch retraction kits use a single-solenoid pull mechanism that generates an audible buzz or click when energized. In high-acoustic-sensitivity applications (hospital patient floors, classroom corridors, library reading rooms, executive office suites, boardrooms, recording studios, courtroom corridors) this noise is a spec violation and a failure mode. SDC's QuietDuo technology uses a dual-solenoid actuation with damped engagement that reduces operational noise to near-silent levels. If the architectural spec calls for "quiet" or "low-noise" electric latch retraction, the LR100CRK is the appropriate retrofit choice. Standard non-QuietDuo latch retraction kits cost less but fail acoustic specifications.

Compatible Corbin Russwin Exit Devices

The LR100CRK retrofit installs on all four Corbin Russwin ED5000 Series exit device platforms: ED5200 rim exit device (single-door perimeter and high-traffic openings), ED5400 surface vertical rod (double-door applications without center mullion), ED5600 mortise exit device (mortise-prep doors), and ED5800 concealed vertical rod (double-door applications with concealed rods for glass and storefront aesthetics). Verify the Corbin Russwin exit device chassis on your existing installation before ordering. For Corbin Russwin lever trim that pairs with electrified ED5000 exit devices, see Corbin Russwin Exit Device Trims.

Specifications

Function: 24VDC electric latch retraction and electric dogging retrofit for Corbin Russwin ED5000 Series. Voltage: 24VDC continuous duty (verify amperage and continuous-duty power supply requirement on order). Compatible chassis: Corbin Russwin ED5200, ED5400, ED5600, ED5800. Acoustic performance: SDC QuietDuo dual-solenoid technology, near-silent operation. Installation: field-installable retrofit (existing exit device does not need to be replaced). Functions provided: electric latch retraction (auto-unlock on signal) and electric dogging (push bar held depressed during specified hours, auto-restored on signal). Power transfer: via electric hinge, electric power transfer (EPT), or door loop; specified separately. Compliance: maintains ANSI/UL fire rating of host exit device when installed per SDC instructions. SDC commercial warranty.

Where to Specify the LR100CRK

Hospital corridor and clinic doors with card reader access control, university classroom corridor doors with scheduled access, multi-tenant office building entries with access systems, healthcare reception double doors with hands-free passage requirements, school administrative entries with auto-unlock during student hours, government office entries with timed access control, courthouse non-public doors integrated with security systems, museum and library reading room doors with quiet-operation specifications, multi-family corridor entries with access control, and any commercial Corbin Russwin ED5000-equipped opening that needs to upgrade from mechanical to electrified operation without replacing the exit device chassis.

Where the LR100CRK Sits in the SDC Exit Catalog

The LR100CRK is one configuration in SDC's QuietDuo retrofit kit family. SDC manufactures equivalent latch retraction kits for other major exit device manufacturers; verify your exit device brand before ordering. For SDC's broader exit hardware catalog, see SDC Exit Devices. For SDC electric strikes that pair with this retrofit on the strike side, see SDC Electric Strikes. For the original Corbin Russwin ED5000 platform exit devices and trims this kit installs on, see Corbin Russwin Devices and Corbin Russwin Exit Device Trims. For Corbin Russwin's factory-electrified trim (alternative approach that electrifies the lever rather than the latch), see the A9903/A9905 and N9903/N9905 electrified trim kits in the Corbin Russwin trims catalog.

Where This Sits in the Site Catalog

The LR100CRK lives under SDC Exit Devices within Panic Exit Devices in Exit Hardware. For SDC magnetic locks and access control accessories, see SDC Electromagnetic Locks and SDC Accessories.