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SDC QuietDuo LR100 Series Retrofit Electric Latch Retraction Kit with 24VDC Motorized Operation
Professional Retrofit Electric Latch Retraction Solution
The SDC QuietDuo LR100 Series retrofit electric latch retraction kit enables electric access control and dogging of panic and fire rated mechanical exit devices. This 24VDC motorized system retracts the exit device latch and pulls the pushpad into the dogged position for momentary or sustained push and pull operation. The patented design provides lower current draw, quieter operation, and greater durability compared to solenoid-based systems while maintaining uninhibited egress at all times.
Professional Features & Benefits
- Motorized Electric Operation: 24VDC motorized system provides lower current draw and quieter operation compared to solenoid alternatives for enhanced reliability.
- Simultaneous Multi-Function: Provides latch retraction, dogging, and pushpad depression in select models for complete door control functionality.
- Retrofit Installation: Installs on select exit device brands without removing the device from the door, reducing installation time and costs.
- Space-Saving Options: LR100-EM models feature two-piece design with external controller board to accommodate smaller field cut devices and limited rail space.
- Fire and Panic Rated: Maintains UL 305 Panic Hardware and UL 10C fire rating compliance for code-required applications.
- Low Energy Compatible: Designed for compatibility with low energy operators and building automation systems.
- High Traffic Durability: Engineered for demanding commercial applications with enhanced durability over time.
- Complete Housing Design: Standard LR100 models are completely housed within the device rail behind the access cover for clean installation.
Technical Specifications
- Commercial/Residential: Commercial
- Department: Door Hardware
- Electronic: Yes
- Product Category: Exit Devices and Trim
- Product Group: Exit Devices and Trim
- Product Model: LR100
- Product Subgroup: Parts and Accessories
- Product Type: Retrofit Electric Latch Retraction Kits
- Product Voltage: 24VDC
- Series: LR100 Series
- Subcategory: Retrofit Electric Latch Retraction Kits
Professional Applications
- Commercial Building Security Systems
- Educational Institution Safety Systems
- Healthcare Facility Access Control
- Retail Loss Prevention
- Industrial Facility Monitoring
- Emergency Exit Compliance
- Government and Municipal Buildings
Why Choose SDC Quality?
SDC QuietDuo LR100 Series products deliver professional-grade reliability with patented motorized design recognized as the market leader in retrofit electric latch retraction. UL 305 Panic Hardware and UL 10C fire rating certifications ensure code compliance for demanding commercial applications. Engineered for high traffic use with lower current draw and enhanced durability where dependable performance is essential.
Manufacturer Resources
SDC Full Catalog
Product Specs
- Subcategory:
- Retrofit Electric Latch Retraction Kits
- Series:
- LR100 Series
- Product Group:
- Exit Devices and Trim
- Product Subgroup:
- Parts and Accessories
- Product Type:
- Retrofit Electric Latch Retraction Kits
- Commercial/Residential:
- Commercial
- Electronic:
- Yes
- Tags:
- sdc lr100ark
- Product Model:
- LR100
- Product Voltage:
- 24VDC
- Product Category:
- Exit Devices and Trim
- Department:
- Door Hardware
SDC LR100ARK – Frequently Asked Questions
1) Can I add electric latch retraction to an exit device that's already installed, without taking it off the door?
That's exactly what the SDC QuietDuo LR100 kit is for. It's a field-installed retrofit that adds electric latch retraction and electric dogging to a mechanical panic or fire rated exit device, and on the supported brands it installs without removing the device from the door. The standard LR100 tucks entirely inside the device rail behind the access cover, so there's nothing hanging off the finished door. You order it matched to the exit device you already own.
2) Which exit device brands does the SDC LR100 retraction kit fit?
The LR100 is built per device, and SDC covers 27 brand families: Adams Rite, Adams Rite EX, Arrow, Cal-Royal, Corbin Russwin, Design Hardware, Detex, Dor-O-Matic, Dorma, Falcon, Falcon 1590 and 1490 Series, First Choice, Hager, IDC, Jackson, Marks, Marshall Best, PDQ, PHI (Precision), Pamex, SDC, Sargent, Stanley K2, Tell, TownSteel, Von Duprin, and Yale. Note Falcon splits into a general option and a separate one for the 1590 and 1490 Series, so pick the right one. Brand alone isn't enough to order, though, you also give the exact device series and model.
3) What's the difference between the LR100 and the LR100-EM latch retraction kit?
Rail space is the deciding factor. The standard LR100 is a single self-contained unit that lives entirely inside the exit device rail behind the access cover. The LR100-EM is a two-piece version: the controller board moves out of the rail into an external module, so it fits devices with limited rail space, including devices that have been field cut down for a narrower door. If your device rail is short or heavily cut, the EM is the one that will physically go in.
4) Will electric latch retraction void the fire rating on my fire exit device?
No. The QuietDuo LR100 kit maintains UL 305 panic hardware and UL 10C fire door compliance on the device it's installed in, and it's built to work on fire rated mechanical exit devices, not just panic-only ones. Egress stays mechanical and uninhibited at all times, so pushing the pad always gets you out regardless of what the electronics are doing.
5) What power supply do I need for an SDC LR100 latch retraction kit?
The LR100 runs on 24VDC. It's a motorized retraction system rather than a solenoid one, which is the point of the design: motor drive draws less current than a comparable solenoid retraction kit, so the power supply and wire run don't have to carry the inrush a solenoid demands. Size the supply for the number of doors you're driving at 24VDC.
6) What information do I have to give when ordering an SDC LR100 kit?
Two things decide the part: the exit device brand, chosen from the 27 SDC supports, and whether you want the standard LR100 or the LR100-EM external module version for tight rail space. Beyond that you specify the exact exit device series and model you're retrofitting, since the kit is matched to the device. Have the model number off the device itself, not just the brand on the pushpad.
7) Can I use electric latch retraction to remotely dog my exit devices instead of dogging them by hand every morning?
Yes, and that's a common reason facilities buy it. The LR100 retracts the latch and pulls the pushpad into the dogged position, so a school or office can push-pull free during business hours and secure at close, all from a switch or the access control system instead of someone walking the building with a hex key. It handles momentary or sustained operation, so it works either as a moment of unlock on a card read or as an all-day dog. Fire rated devices, note: electric dogging on a fire door is not the same as mechanical dogging, and code governs how you schedule it.
8) If the power fails, can people still get out through a door with an LR100 installed?
Yes. Egress stays uninhibited at all times, because the kit doesn't lock the door, it only retracts the latch and dogs the pushpad electrically. Drop the power and the exit device reverts to its normal mechanical operation: push the pad, the latch releases, the door opens. What you lose in a power failure is the free push-pull and any remote unlock, not the ability to exit.
9) Will an LR100 work with an automatic door operator on the same opening?
It's built for that pairing. The LR100 is stated compatible with low energy operators and building automation systems, which is the standard sequence on an accessible entrance: the retraction kit pulls the latch first, then the operator swings the door, so the operator is never fighting a latched bolt. Wire the operator to trigger retraction ahead of the swing.
10) Is a motorized latch retraction kit better than a solenoid one for a high traffic door?
On a door cycling all day, the motorized approach is the reason to pick this one. SDC's patented QuietDuo design gives lower current draw, quieter operation, and greater durability than solenoid-based retraction, and the loud clack a solenoid makes on every actuation is a real complaint in libraries, clinics, and offices. It's engineered for demanding commercial applications, and this is a commercial-only product, not a residential one.
11) Can one LR100 kit both retract the latch and hold the pushpad down?
On select models, yes, all three at once: latch retraction, dogging, and pushpad depression. That combination is what lets the door read as a free push-pull opening rather than one where the latch is pulled but the pad still sticks out. Which functions you get depends on the device model the kit is built for, so it's tied to the exit device series you specify on the order.
How fast can I get the SDC LR100ARK delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the
continental
U.S.
Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit,
reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the SDC LR100ARK come with a warranty?
Absolutely. The SDC LR100ARK is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the SDC LR100ARK?
You can call, text, or email our expert support team for fast answers. We’re here to help with
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selection,
installation tips, and troubleshooting. Contact Us
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