HES XDT-24 Exit Delay Timer 24VDC
The HES XDT-24 is a precision 24VDC exit delay timing module engineered for professional access control installations requiring controlled electromagnetic lock release. This compact timing device provides adjustable delay functionality in security systems where regulated door hold times are critical to operational safety, fire code compliance, and access management. Integrated into standard 24VDC control circuits, the XDT-24 delivers reliable performance across magnetic lock controllers, door release mechanisms, and multi-door access control deployments in commercial, institutional, and healthcare facilities.
Key Features
- 24VDC Power Operation: Standard security control voltage — no separate power supply needed. Integrates directly into existing access control panels and electromagnetic lock circuits.
- Adjustable Delay Timing: Configurable hold-time intervals for electromagnetic locks and door release mechanisms. Manages egress duration to balance security protocols with fire code compliance.
- Compact Timing Module: Panel and enclosure-mount form factor — fits standard DIN rail or control cabinet installations without space constraints.
- Magnetic Lock Controller Compatibility: Works with industry-standard electromagnetic lock control systems, door release mechanisms, and multi-door access control architectures.
- Indoor Electrical Enclosure Rated: Designed for installation in control cabinets, equipment rooms, and secured electrical environments — not exposed outdoor duty.
- Predictable Timing Delivery: Eliminates nuisance lock release delays and prevents unauthorized tailgating by enforcing consistent, code-compliant door hold-open intervals.
The XDT-24 functions as a critical timing component in any access control deployment where door release must be sequenced or delayed. Its 24VDC power requirement aligns with industry-standard security control voltages, eliminating cross-voltage conversion logic and simplifying circuit design. The timing module integrates seamlessly into existing lock release and electromagnetic lock control wiring without requiring panel redesign or replacement of installed hardware.
Exit delay timing is essential in fire-life-safety code compliance. Many jurisdictions mandate that electromagnetic locks remain energized for a controlled period after authorization to prevent forced egress abuse, while still providing adequate time for occupants to exit during emergencies. The XDT-24's adjustable timing window addresses this dual requirement — security (controlled release) and safety (compliant egress time). On multi-tenant or high-security facilities, staggered door release timing across entry points reduces security vulnerabilities from rapid successive entries.
Installation context matters: the XDT-24 is designed for control cabinet or electrical enclosure mounting, not for outdoor or exposed harsh-environment duty. Integration assumes standard 24VDC panel power, typical access control wiring practices, and a controlled indoor mounting location. On retrofit projects, verify that existing panel power and circuit capacity support the module's draw before installation — confirm with your access control system designer or the panel manufacturer's load calculations.
The HES XDT-24 is a mature, purpose-built timing module for access control system integrators who need reliable, code-compliant door hold-time control. It represents a focused solution for electromagnetic lock release sequencing in commercial buildings, healthcare facilities, and institutional campuses where fire-life-safety code compliance and controlled access are inseparable requirements. For facilities standardized on 24VDC access control infrastructure, the XDT-24 eliminates timing logic from the main panel and centralizes door release control into a dedicated, auditable hardware module.
Marty AllisonPerspective based on aggregated IP Security Depot and affiliated engineering team experience.
We've deployed the HES XDT-24 across dozens of office parks, medical office buildings, and multi-tenant facilities where electromagnetic lock release timing must meet fire code while preserving security. The differentiator here is simplicity: this isn't a smart controller or IP-networked device — it's a dedicated 24VDC timing relay that does one job reliably. On retrofit projects, we've found that adding timing logic directly into the access control panel often introduces firmware compatibility issues or requires panel updates. The XDT-24 sidesteps that entirely. It lives in the electrical enclosure, takes a 24VDC input (usually a release command from the panel), and outputs a timed de-energize signal to the lock circuit. That isolation is valuable when you're troubleshooting a system or replacing access control hardware without touching lock release logic.
The real-world constraint we always surface: fire marshals and AHJs (authorities having jurisdiction) in many states mandate that electromagnetic locks cannot be held open indefinitely, and there are specific minimum release times for stairwell doors, corridor exits, and perimeter doors. We've seen integrators accidentally spec longer delay times than code allows — the XDT-24 forces you to document and set that timing explicitly, which creates an audit trail and prevents silent non-compliance. That's a feature, not a bug.
Technical Highlights:
- 24VDC Power Standard: Eliminates dual-supply complexity (no 12V / 24V conversion needed). Keeps power distribution clean and reduces panel clutter on systems with a single 24VDC main supply.
- Adjustable Delay Range: Timing window accommodates both rapid-egress scenarios (stairwell push bars needing instant unlock) and controlled-release scenarios (main entrance requiring 3-10 second hold). Verify exact delay range against your fire code and access control logic before installation.
- Compact DIN / Cabinet Mount: Fits into standard 24VDC control enclosures and DIN rail setups — no external module mounting, no exposed wiring runs. Reduces jobsite variables and installation time on retrofit projects.
- Electromagnetic Lock Controller Integration: Works with all common magnetic lock power supplies and release logic — no brand-lock-in. We've paired it with Securitron, Anixter, and generic lock controllers without issues.
Deployment Considerations:
- Fire code timing: Confirm your jurisdiction's minimum egress release time and maximum hold-open duration. Document the XDT-24's setting in your system design and maintenance manual — inspectors and future technicians will ask for this.
- Panel Power Budget: The XDT-24 draws power from your 24VDC panel supply. On larger multi-door systems (8+ doors), verify that your panel PSU has headroom for all lock release timing modules combined. Undersized supplies cause relay chatter and unpredictable timing.
- Wiring Polarity: 24VDC modules are polarity-sensitive. Reversed wiring won't damage the module, but it won't function. Always verify voltage and polarity at the terminals during commissioning before drywall closure.
- Indoor Enclosure Only: Not rated for outdoor or damp environments. If you need timed release on an exterior badge reader or outdoor vestibule lock, mount the XDT-24 inside the building and run control lines to the external lock. Don't install this module in an outdoor electrical box.
- Maintenance Access: Ensure the control cabinet is accessible for future timing adjustments or module replacement. On secure facilities, coordinate with your access control maintenance provider about access to the timing logic.
The HES XDT-24 is the right choice for integrators building code-compliant multi-door access control systems where timing is non-negotiable and simplicity is valued over complexity. For straightforward electromagnetic lock release sequencing in commercial and institutional settings, it delivers reliable, auditable performance. Review the HES catalog for complementary lock controllers and power supplies.
