SDC’s LR100 Series ELR Kits Are the Top Choice for Access Control in the U.S.

Electrify Exit Devices With Confidence

Whether you’re installing in Los Angeles, New York, Chicago, Atlanta, or Houston, access control professionals across the United States trust SDC’s QuietDuo™ LR100 Series Retrofit Electric Latch Retraction Kits for electrifying mechanical exit devices. With unmatched compatibility, efficient motorized performance, and proven cost savings, LR100 series kits remain the industry-leading solution for retrofit electric latch retraction (ELR).

— Instant Door Zen

www.sdcsec.com/LR100

What Makes QuietDuo™ LR100 the Smart Retrofit Solution?

1. Motorized ELR: A Proven Leader Since Day One

In 2012 SDC introduced the first motorized retrofit ELR kit to the market with the QuietDuo™ LR100 Series. Unlike older solenoid-based options, motorized ELR operates quieter, with lower power draw and increased durability — making it ideal for busy commercial buildings, schools, hospitals, and municipal facilities.

2. Retrofit Without Replacing Exit Devices

Installers in cities from Seattle to Miami appreciate that LR100 kits retrofit select panic and fire-rated exit devices without removing the hardware from the door. This means less downtime, fewer callbacks, and a faster path to access control integration.

3. Accessible Across Brands

The LR100 Series supports a wide range of exit device brands — empowering technicians to electrify doors throughout diverse portfolios of buildings and door hardware layouts. This broad compatibility simplifies specification and inventory for security teams nationwide.

4. Reduced Installation Costs

With motorized technology, installers benefit from significant labor savings, lower power requirements, and no need for door sequencers on paired manual doors — translating into a faster, more efficient install process.

Key Benefits at a Glance

• QuietDuo™ Motorized Operation: Quieter than solenoid kits with improved lifetime performance.
• Universal Access Control Compatibility: Activates via access control, remote controls, or building automation.
• Uninhibited Egress: Supports safety codes with always-free exit.
• Cost-Effective Retrofit: Eliminates costly hardware replacements.
• Models for Tight Spaces: Standard rail-mounted and LR100-EM two-piece units for compact door rails.

What Installers Love

Security installers across the U.S. consistently highlight that LR100 kits quickly retrofit existing doors (usually less than an hour) and avoid complex demolition or hardware swaps. With lower amperage draw, they’re compatible with common power supplies and modern access systems.

Conclusion

From New England to the Southwest, SDC’s QuietDuo™ LR100 Series Retrofit Electric Latch Retraction Kits offer a reliable, efficient, and retrofit-ready ELR solution for mechanical exit hardware. Whether you’re upgrading access control in a school in Phoenix or a corporate campus in Dallas, LR100 kits deliver performance installers trust — backed by decades of industry leadership.