HES 15.23--08940R11 Electric Strike

We've installed the HES 15.23--08940R11 in hundreds of door sets across corporate, educational, and government facilities. The appeal is straightforward: it's a no-nonsense fail-secure strike that works reliably with any access control panel that can switch 24VDC to ground. The coil is robust, the latch geometry is forgiving (wide acceptance window for frame variance), and the price-to-reliability ratio makes it the default spec for secondary controlled doors where customers aren't ready to commit to networked locks or mobile credential infrastructure. In our experience, integrators choose this strike when they're retrofitting an older building with a new access panel—it drops into the existing strike pocket without modification, which saves days of frame repair and finish touch-up work. The downside: it's a fail-secure device only. If you need fail-safe (unlocked on power loss) for emergency egress, pair it with an electromagnetic lock on a second frame anchor, or step up to a networked strike with integrated UPS. We also recommend running separate 24VDC power to the strike rather than daisy-chaining it with the reader or controller—voltage sag accumulates on shared runs, and door response times degrade noticeably once you're past 6-8 strikes on a single supply.

Technical Highlights:

• 24VDC Relay Output Direct Drive: Coil impedance is ~200Ω—well within the output capacity of any solid-state or mechanical relay on a standard access control panel. No voltage booster or relay module required. We've never seen one fail due to undersized panel output.
• Fail-Secure Posture: Door remains locked on power loss, panel fault, or credential system outage. Critical for secured corridors and equipment rooms where you cannot risk unintended access during downtime. Integrators often spec this as the default for all secondary doors in a multi-door security plan.
• Fast Coil Response (40-60ms): Energize-to-latch-retract timing is tight enough that door opening feels responsive to the end user. No hesitation or delay that would frustrate high-traffic flows (lobbies, main entries). We've never had end-user complaints about strike response lag on this model.
• Compact Footprint & Low Weight (2 lb): Fits flush into standard door frame strike pocket. Installation is a simple bolt-down to the frame face—no custom drilling, no frame reinforcement. Retrofit speed is a real differentiator on large-scale projects.
• Isolation from Control Panel: Strike coil is DC-only, galvanically isolated from any panel signal ground. Eliminates loop current issues and intermittent false unlocks caused by noisy AC-coupled systems. This matters on older facilities with long wire runs or poor facility grounding.

Deployment Considerations:

• Fail-secure only — if your egress strategy requires fail-safe unlock on power loss, do not use this strike as the sole door control. Pair with an electromagnetic lock or weighted pushbar, and verify your life safety plan with the fire marshal before installation.
• 24VDC power supply capacity — a single 2-3A supply can power 8-10 strikes without voltage sag. Beyond that, use redundant supplies or distributed 24VDC rails. Test voltage at the strike terminals during simultaneous multi-door activation; if it dips below 20VDC, coil response times degrade and nuisance failures increase.
• Wire gauge and run length — for strikes more than 50 feet from the panel, use 14AWG (minimum) to minimize IR drop. Measure voltage at the strike, not at the panel. We've seen sites where a 100-foot run on 18AWG resulted in 16VDC at the strike and intermittent release failures.
• Latch alignment — inspect frame and strike pocket on initial setup. Misaligned frames cause binding; the strike coil can energize but the latch won't retract cleanly. Shim or file frame face as needed. This is a 10-minute site check, not a design issue, but it matters on retrofit jobs.
• Wiring termination — use fork lugs or solder connections on the coil terminals. Mechanical wire-nuts on low-voltage DC are a nuisance failure waiting to happen; oxidation builds up and you get intermittent faults six months in. Solder or crimp every time.

The HES 15.23--08940R11 is the right choice for integrators standardizing on fail-secure door control for secondary secured corridors, equipment rooms, and restricted-access buildings where the control panel is the source of truth for all unlock decisions. If you're deploying a networked or mobile credential system, this hardwired strike sits cleanly downstream and requires no firmware updates or network management—it just works. For more options and system-level access control solutions, see the HES catalog.