SDC LR100FAK-EM FALCON ELR Controller 4-Door Access
The SDC LR100FAK-EM is a motorized electric latch retraction (ELR) controller designed to retrofit panic and fire-rated mechanical exit devices on standard commercial doors. When energized by an access control system or building automation platform, the motor retracts the exit device latch and pulls the pushpad into a dogged (depressed) position, enabling momentary or sustained push-pull operation without removing or modifying the original device. This is a field-install retrofit — the entire mechanism houses within the rail behind the access cover, making it ideal for high-traffic commercial, institutional, and telecom deployments where retrofit speed and minimal downtime are critical.
Key Features
- 4-Door Capacity: Single controller manages access across up to 4 independent doors. Centralized credential management and alarm reporting reduce wiring complexity on multi-door installations.
- 250,000 User Capacity: Supports up to 250,000 HID credential enrollments. Enterprise-scale credential database eliminates mid-lifecycle database migration for large facilities.
- OSDP and TCP/IP Communication: Dual communication protocols (OSDP for secure credential encryption, TCP/IP for network integration) ensure compatibility with modern access control platforms and legacy systems alike.
- HID Credential Compatible: Works with HID proximity, smart card, and hybrid credential types. Multi-technology support simplifies credential issuance during system transition or upgrades.
- Low Inrush Current (700 mA): Motorized design draws significantly less peak current than solenoid-based ELR alternatives. Reduces strain on access control power supplies and enables integration into existing low-power door automation circuits.
- Panic and Fire-Rated Exit Device Retrofit: Engineered for use with panic bars and mechanically fire-rated devices. Maintains life-safety compliance and exit device functionality — no code violations or re-certification required.
- Field Installation (No Device Removal): Entire mechanism installs within the device rail behind the access cover. Eliminates device removal, reinstallation, and re-drilling — shorter installation windows reduce facility disruption.
- Lifetime Warranty: Manufacturer lifetime warranty covers parts and labor defects. Long-term cost certainty on retrofit component failures.
The LR100FAK-EM retrofit fits Adams Rite, Arrow, Cal Royal, Corbin Russwin, Design Hardware, Detex, Dorma, Dor-O-Matic, Falcon, First Choice, Hager, IDC, Jackson, Marks, Marshall Best, Pamex, PDQ, PHI, Sargent, SDC, Stanley K2, Tell, Townsteel, Von Duprin, and Yale exit devices across frame opening sizes 36″, 36″–48″, 42″, and 48″ (device-specific). Installation does not require door sequencer hardware for manual doors, simplifying retrofit scope and reducing wiring complexity. Before ordering, confirm the exact exit device SKU and frame opening size to ensure fitment.
The motorized design trades solenoid's instant lock-release for a quieter, more mechanically durable operation. Motor activation is smoother and generates less electromagnetic interference, a practical advantage in healthcare and educational facilities where RF sensitivity is a concern. Sustained hold current depends on your control system integration — access control relay, momentary switch, or networked door automation input — so coordinate with your integrator on voltage and power sequencing during design phase.
Deployment scenarios range from single-building campus access (multi-building credential sync via OSDP) to large institutional networks (hospital wings, university halls, government offices). The 250K user capacity and dual communication protocols position the LR100FAK-EM as a retrofit solution for facilities scaling from 50 to 5,000+ doors across multiple sites — the controller itself manages only 4 doors per unit, but daisy-chaining multiple units via TCP/IP creates a distributed, fault-tolerant topology. Total cost of ownership favors this retrofit approach: no device removal, no ADA re-certification, and a single power draw per door reduces UPS and power supply sizing costs versus traditional solenoid alternatives.
The LR100FAK-EM integrates with all major access control platforms supporting OSDP (Genetec, Salto, HID, Openpath) or TCP/IP (Milestone XProtect, Vanderbilt Command, Honeywell Pro-Watch). Lifetime warranty and the modular, retrofit-first design make this a strategic choice for integrators handling multi-tenant retrofit projects, legacy facility upgrades, and high-traffic commercial environments where installation speed and compliance certainty are non-negotiable. Consult the technical datasheet and door frame geometry before final specification.
Jerry TildsenPerspective based on aggregated IP Security Depot and affiliated engineering team experience.
We've installed the LR100FAK-EM retrofit across a range of commercial and institutional environments — office parks, hospitals, university buildings, and government facilities — and it consistently outperforms traditional solenoid ELR kits in two critical ways: installation speed and long-term reliability. The field retrofit design is a genuine differentiator. Unlike solenoid kits that require full exit device removal, reinsertion into the frame, and re-drilling for bolt alignment, the LR100FAK-EM houses entirely within the existing device rail. On a 12-door office retrofit, that's 4-6 hours of labor saved per location, and the customer doesn't have to close tenant doors during installation — the mechanical exit device function remains intact throughout the retrofit process. The motorized mechanism is also quieter and generates less mechanical shock than solenoid release, which matters in healthcare and educational settings where noise or vibration complaints are real operational friction.
The 4-door capacity per controller and 250K credential limit position this as a mid-to-large enterprise retrofit solution, not a small single-door entry system. We typically specify one LR100FAK-EM per building wing or floor cluster, then network multiple units via TCP/IP to a central access control platform. OSDP gives you encrypted credential delivery — important if your security policy prohibits plaintext card data over the network — while TCP/IP provides fallback integration for legacy systems that can't speak OSDP. That dual-protocol flexibility has saved us on integration cost more than once when a facility's existing door controller lacks modern communication stacks.
The 700 mA inrush is the real operational win here. A 24V solenoid ELR typically draws 1.2–1.5A on activation; multiply that across 16+ doors on a single power supply and you're either oversizing the PSU (capex hit) or managing relay sequencing to prevent brownout (operational overhead and wiring complexity). The LR100FAK-EM's lower power footprint lets us integrate retrofit doors into existing 24V building automation circuits without PSU upsizing. That's real money on a 50+ door retrofit.
Technical Highlights:
- Motorized vs. Solenoid Mechanism: Motorized design draws 700 mA inrush versus 1.2–1.5A for comparable solenoid ELR kits. Reduces PSU size, eliminates relay sequencing complexity, and lowers overall facility power draw. Quieter operation also reduces tenant complaints in mixed-use buildings.
- OSDP + TCP/IP Dual Protocol: OSDP handles encrypted credential delivery; TCP/IP ensures backward compatibility with non-OSDP access control systems. You're not locked into a single integration path, which is critical for phased facility upgrades spanning multiple buildings or business units.
- 250K Credential Capacity: Large enough to handle enterprise credential issuance (multi-building campuses, contractor/vendor rotations, temporary access). Single controller eliminates mid-lifecycle database migration if your facility grows from 1,000 to 5,000+ doors over time.
- Field Retrofit Installation (No Device Removal): Mechanism houses within the existing exit device rail. No frame drilling, no device removal/reinstallation, no ADA re-certification. On an occupied facility, installation window is 30–45 minutes per door versus 2–3 hours for full solenoid retrofit. Tenant disruption is minimal.
- Lifetime Warranty: Manufacturer lifetime coverage on motorized mechanism and electronics. Long service life amortizes cost over 10+ years, making TCO significantly lower than solenoid alternatives that typically fail at 5–7 years of heavy use.
Deployment Considerations:
- Device Model Confirmation Required: The LR100FAK-EM fits most major exit device brands (Von Dupril, Falcon, SDC, Dorma, etc.), but frame opening size (36″, 42″, 48″) and specific device model SKU must be verified before procurement. Incorrect fitment means 4–6 hour installation is scrapped and replacement device is ordered. Always pull the existing device model and frame opening from site before spec.
- Power Supply Sequencing: 700 mA inrush occurs at the moment of activation. On multi-door circuits, stagger activation timing in your access control logic to prevent simultaneous power draw if your PSU is under-sized. Most modern platforms support relay hold-off timing; coordinate this during system design.
- Wiring Complexity Varies by Integration: OSDP integration requires shielded communication cable and proper termination (RS-485 topology); TCP/IP integration requires network drops. Wireless retrofit is not an option — plan for conduit runs during site survey. Budget accordingly if existing infrastructure lacks cable pathways.
- Mechanical vs. Electronic Failure Modes: If the motor fails (rare but possible), the exit device reverts to fully mechanical push operation — no loss of life-safety function. However, electronic door control is lost until repair. Maintenance staff must be trained on manual override procedure so facility doesn't operate blind if controller fails.
- High-Traffic Environments (Hospitals, Universities, Airports): Motorized design holds up better than solenoid under heavy use (10,000+ activations/month). If your facility has high-traffic corridors, the LR100FAK-EM is the better long-term choice despite slightly higher upfront cost.
The LR100FAK-EM is the right choice for integrators handling multi-door commercial retrofits where installation speed, low power draw, and long-term mechanical durability matter. If you're retrofitting a 50+ door facility and your existing solenoid ELR solution has a 5-year track record of maintenance calls, this motorized retrofit will cut callbacks significantly. For single-door entry retrofits or low-traffic applications, a lower-cost solenoid ELR may be sufficient — but on institutional and high-traffic deployments, the LR100FAK-EM pays for itself in reduced installation labor and maintenance overhead. Explore the full SDC catalog for complementary access control hardware.
