Upgrading exit devices for access control usually comes down to how you retract the latch: a motor‑driven kit or a solenoid kit. Both preserve free egress on the inside while enabling card/fob/PIN/mobile entry from the outside—but they differ in power use, noise, and how well they handle door preload. This guide spotlights two proven options from Command Access Technologies—the MLRK1‑VD (motorized, for select Von Duprin devices) and the ARLP88‑KIT (solenoid, for Adams Rite 8800)—and closes with a simple selection checklist and install tips. We also mention comparable solutions from other brands for context.

Why Electrify a Panic Bar?

• Add credentialed entry while keeping the push bar for life safety

• Support scheduled unlocks (hold latch retracted during business hours)

• Often cleaner and more code‑friendly than surface magnetic locks on many openings

Motor vs. Solenoid (At a Glance)

Need / Feature	Motor‑Driven Kit	Solenoid Kit
Noise & smoothness	Very quiet, smooth pullback	Louder click/buzz possible
Long “unlock” schedules	Excellent (efficient during hold)	Limited; watch duty cycle/heat
Preload tolerance	Better with stack pressure/weatherstrip	More sensitive to preload
Power profile	Inrush at start, low hold current	Higher current while energized
Cost & simplicity	Higher upfront, premium feel	Budget‑friendly, simple wiring

Product Spotlights — Command Access Technologies

MLRK1‑VD (Motorized Latch Retraction for Von Duprin 33/35 & 98/99)

What it is: A purpose‑built motorized pullback kit that converts compatible Von Duprin rim and vertical‑rod exit devices into electrified latch retraction.

Why it stands out:

• UL‑listed kit designed for a fast, clean retrofit

• Integrated Request‑to‑Exit (REX) switch on US models for straightforward panel wiring

• Smooth, quiet operation and consistent performance on high‑traffic doors

• Backed by a 3‑year, hassle‑free warranty

Best applications:

• Main entries/corridors that run timed unlocks for extended periods

• Doors with preload (stack pressure/weatherstrip) where motor‑driven pullback excels

• Schools, healthcare, offices—anywhere quiet and reliability matter

Power notes: Use a listed 12/24 VDC supply with adequate inrush capacity for startup; holding current is low. Add door position monitoring if you log events.

ARLP88‑KIT (Solenoid Latch Retraction for Adams Rite 8800 Series)

What it is: A solenoid‑based, field‑installable kit that electrifies Adams Rite 8800 series exit devices for momentary latch retraction or timed dogging.

Why it stands out:

• Installer‑friendly: typically the only new hole is the raceway, making retrofits fast and tidy

• Ideal when cost and simplicity are priorities

• Factory prep available for 12V or 24V solenoids to match your power design

Best applications:

• Aluminum/glass storefront doors using Adams Rite hardware

• Buzz‑in and short retraction scenarios (intercom, timed access windows)

• Retail, small offices, and doors not held unlatched for long periods

Power notes: Plan for higher current while energized and mind duty cycle/heat if scheduling longer holds. A supervised power supply sized for the run and accessory load is recommended.

Selection Checklist

• Exit device brand/model: Ensure the kit matches your exact device (e.g., Von Duprin 33/35, 98/99 or Adams Rite 8800)

• Use pattern: Long business‑hours unlocks → choose motor; short buzz‑in → choose solenoid

• Door conditions: Preload from weatherstripping/stack pressure favors motorized kits

• Power design: 12/24 VDC, inrush (motor) vs. steady draw (solenoid), battery backup, supervision

• Code & ratings: Fire‑rated openings; dogging vs. latch retraction; AHJ (Authority Having Jurisdiction) expectations

• Monitoring: Door position (DPS), REX, and any latch/bolt status your panel requires

Install Tips

• Bench test the kit before mounting to confirm travel and timing

• Set closer and strikes first to reduce preload problems

• Use the correct wire gauge for run length to avoid voltage drop

• Tune relock delay so the bar fully resets before re‑engaging

• Label conductors and document settings for your AHJ (Authority Having Jurisdiction) and future service

Bottom Line

For quiet, efficient, and reliable long‑duration pullback on compatible Von Duprin devices, the MLRK1‑VD is a strong choice. For Adams Rite storefronts where you primarily need short, momentary retraction and a simpler retrofit, the ARLP88‑KIT is hard to beat. Both integrate cleanly with modern access control and preserve life‑safety egress.