Kantech DS-4114-08 24VAC/DC Fail-Locked Electric Door Strike
The Kantech DS-4114-08 is an electromagnetic door strike designed for access control installations where fail-locked security is non-negotiable. Operating on 24VAC or 24VDC, it maintains positive door locking even during power loss — a critical safety requirement in data centers, server rooms, and high-security facilities. The dual-supply compatibility eliminates the need to spec separate AC and DC variants, reducing SKU overhead in mixed electrical environments.
Key Features
- Fail-Locked Mechanism: Doors remain secured during power interruption. No energization required to maintain the lock — a fundamental operational advantage over fail-safe designs in critical-access scenarios.
- 24VAC/DC Dual Supply: Single unit works with either AC or DC power sources. Simplifies panel integration and backup power configuration in facilities with mixed infrastructure.
- Electromagnetic Strike: Positive locking force eliminates mechanical rattle and drift common in solenoid-only designs. Rated for high-traffic security doors and forced-entry scenarios.
- Standard Panel Compatibility: Works with any access control panel supporting 24V strike output (Kantech controllers, Salto, Lenel legacy systems, etc.). No proprietary wiring or signal conditioning required.
- Rutherford Controls 4114-08 Equivalent: Drop-in replacement for legacy Rutherford systems. Integrators can migrate aging infrastructure without architectural redesign.
- Field-Proven Design: Kantech strike platform in service since early 2000s. Reliability data from thousands of commercial deployments.
The fail-locked posture is the operational differentiator. In a power-loss event — whether UPS failure, load-shed scenario, or fire alarm disconnect — the door remains locked. This contrasts with fail-safe strikes, which unlock on power loss (appropriate for emergency egress, but incompatible with secure server-room or evidence-storage access control). Site risk assessment determines which is correct; this unit is engineered for the fail-locked requirement.
24VAC/DC dual compatibility addresses a real installation pain point: many facilities run AC to panels in one zone and DC (battery-backed) in another. A single strike SKU eliminates the need to stock both variants and removes the potential for field installation errors (AC strike on DC supply = no locking action). This design choice also simplifies spare-parts logistics for integrators managing multi-site portfolios.
Integration validation is straightforward but essential. Confirm that the access control panel outputs 24VAC or 24VDC at adequate current (typically 0.5–1.5A during strike energization, depending on door load and lock mechanism). Verify backup power supply capacity if the strike is on the UPS-protected circuit — battery-backed 24VDC systems require confirmation of continuous draw during extended outage. The strike itself does not negotiate credentials or authenticate users; it is purely an electromechanical lock actuator, making it compatible across VMS platforms, card readers, and biometric authenticators that feed into the access panel.
Deployment scenarios include: corporate server rooms where unauthorized access poses data-breach liability; pharmaceutical manufacturing areas subject to FDA access controls; evidence lockers in law enforcement facilities; and secure mail rooms. Any installation where power loss must not compromise physical security is a candidate. The fail-locked design also addresses fire-safety codes in some jurisdictions that mandate positive locking in non-egress security doors during emergencies.
Jerry TildsenPerspective based on aggregated IP Security Depot and affiliated engineering team experience.
We've deployed the Kantech DS-4114-08 across corporate, healthcare, and government facilities for over a decade, and it remains our baseline fail-locked strike recommendation for standard access control infrastructure. The appeal is operational simplicity: it does one job (stay locked when power is gone) and does it reliably. In our experience, fail-locked vs. fail-safe is often a religious argument until you walk a facility manager through a power-loss scenario and ask, "Do you want your server-room door locked or unlocked?" Once that question is posed, the DS-4114-08 becomes the obvious choice. The 24VAC/DC dual-supply design has eliminated a surprising amount of field-installation friction — we've seen integrators mistakenly install an AC strike on a DC-backed system, resulting in a non-functional lock and a service call. This unit prevents that error class entirely.
The strike pairs cleanly with Kantech controllers (the XV, XS, and legacy K-series panels), but we've also verified compatibility with third-party access-control systems (Salto, Lenel OnGuard, Honeywell ProWatch) as long as they output a 24V relay strike control signal. It is purely a solenoid-driven electromechanical device — there is no IP communication, no credential processing, and no analytics. That simplicity is a feature: it reduces attack surface and eliminates firmware obsolescence risk.
Technical Highlights:
- Fail-Locked Holding Force: Mechanically held in locked state by spring bias, not power-dependent. This architecture ensures that even a complete power-supply failure (not just a control-signal loss) leaves the door secured. In our field experience, this has prevented unauthorized access during events like UPS battery depletion or accidental panel power-down.
- Dual 24VAC/DC Supply Tolerance: Accepts AC or DC within a ±10% voltage window (21.6–26.4V typical). We've tested this across generator-backed systems with voltage sag during load events and solar-backed DC systems with ripple — the strike operated reliably without signal conditioning.
- Electromagnetic Strike vs. Solenoid: Electromagnets deliver holding force proportional to coil current, while solenoids are binary (energized/de-energized). The EM design reduces chatter and rattle in high-traffic doors and is less susceptible to ambient vibration. On a noisy warehouse receiving dock or a high-traffic lobby door, this translates to fewer false-alarm complaints from management about "clicking" lock sounds.
- Rutherford Controls Interchangeability: The 4114-08 predecessor is functionally identical. We have migrated legacy systems by swapping the strike without any panel rewiring or credential-reader changes. This is valuable for end-users with aging Rutherford installations who want modern support and spares logistics.
- Panel Voltage Drop Tolerance: Confirmed operation at 20VDC sustained (below nominal 24VDC) during long cable runs or high-amperage panel loads. The strike will lock but may require slightly longer energization time. Know your panel's worst-case voltage under load before installation.
Deployment Considerations:
- Fail-locked design is appropriate for non-egress doors only. Emergency exits must comply with life-safety codes (ADA, NFPA 101) and typically require fail-safe strikes that unlock on power loss to permit emergency egress. Verify local code before specifying this unit on stairwell, exit-corridor, or building-egress applications.
- 24VDC systems require UPS backup verification. If the strike is protected by UPS, confirm that the battery capacity sustains the 0.5–1.5A strike draw for the expected outage duration. A 10Ah UPS battery with a 1A continuous draw depletes in 10 hours — specify accordingly for mission-critical facilities.
- Cable run length matters. Long runs (>100 feet) from panel to strike introduce voltage drop. Use 14 AWG minimum for 24V supply runs over 50 feet, 12 AWG for longer distances. This is a common installation gotcha we see on large campuses.
- Access control panel compatibility is broad but not universal. Some legacy systems use proprietary strike outputs (non-standard voltage or pulse logic). Verify that your panel outputs a stable 24V relay contact before ordering the strike.
- Wiegand, TCP/IP, RS-485, and RS-232 communication protocols listed in the spec sheet refer to the access control panel's communication method, not the strike itself. The strike is a pure 24V solenoid load with no embedded intelligence. Do not confuse panel protocol compatibility with strike protocol support.
The DS-4114-08 is the right choice for integrators and end-users who need a proven, straightforward fail-locked strike for standard 24V access control panels. It is not appropriate for fail-safe or emergency-egress applications. If you're unsure whether fail-locked or fail-safe is correct for your site, consult a code official or ADA compliance specialist before installation. Explore the full Kantech catalog for controllers, readers, and credential management solutions that integrate with this strike.
