Altronix PT724A 365-Day Event Timer Relay Module
The Altronix PT724A is a rack-mount timer relay designed for applications requiring long-duration event scheduling—gate automation, access control cycles, HVAC synchronization, and security system relay management. Operating on 12/24 VDC or 12/24 VAC input, the module delivers a single relay output with 365-day programming capability and integrated battery backup to maintain timing accuracy across power interruptions.
Key Features
- 365-Day Event Timer with 24-Hour Resolution: Program annual cycles or extended maintenance schedules directly into the module—useful for facilities that need gate closures on specific dates, seasonal HVAC changes, or recurring security drills without manual intervention or external software.
- Dual Voltage Input (12/24 VDC and 12/24 VAC): Install across multiple infrastructure types without stock-keeping different models; bridges legacy AC systems and modern DC-powered setups in the same cabinet.
- Single Relay Output: Provides NO/NC/COM switching contact rated for controlling solenoid locks, gate motors, lighting circuits, or alarm system relays—sufficient for most single-circuit automation tasks.
- Integrated Battery Backup: Maintains timer operation during AC mains loss or DC supply interruption—critical for access control or barrier systems where loss of schedule timing could create operational gaps or security exposures.
- Rack-Mount Form Factor: Fits standard 19-inch equipment racks alongside power distribution, NVRs, access control panels, and other infrastructure—eliminates the need for wall-mounted timing cabinets and consolidates control logic into a single enclosure.
- Lifetime Limited Warranty: Covers defects in materials and workmanship for the product lifespan, reducing lifecycle replacement costs in stable deployments.
Deployment Context
The PT724A targets security integrators and facility managers who need programmable timing independent of a networked VMS or access control server. Use cases include: automated gate cycles that open at 6 a.m. and close at 10 p.m. year-round; HVAC power control synchronized to facility operating hours; and relay-triggered alarm system notifications on specific dates. The 24-hour resolution means you can't trigger events at, say, 2:47 p.m.—only at whole-hour or fixed daily intervals—so applications requiring minute-level precision should consider a networked timer or programmable logic controller instead.
Because the PT724A relies on battery backup to preserve timing during power loss, verify the battery replacement procedure and interval with the manufacturer documentation before deploying in mission-critical environments. Battery refresh cycles should be factored into preventative maintenance schedules.
Power & Compatibility
The module accepts 12/24 VDC or 12/24 VAC input, making it compatible with most DC-regulated power supplies and standard AC transformer outputs found in security cabinets. The single relay output is a dry contact suitable for low-current switching (verify contact ratings in the datasheet for your specific load); high-current loads (e.g., 24VDC solenoids drawing >2A) may require an intermediate contactor. Wire the PT724A into your cabinet using standard terminal blocks and integrate the relay output into your access control, lighting, or gate control circuit.
Frequently Asked Questions
Q: Does the PT724A support network connectivity or remote programming?
A: No. The PT724A is a standalone timer module with no Ethernet, serial, or wireless interface. All programming must be configured via physical controls on the unit or through a local connection during installation.
Q: What happens to the programmed schedule if the battery fails?
A: The integrated battery backup preserves timing during power loss, but the battery will eventually deplete. Monitor battery condition and replace according to the manufacturer's maintenance schedule to prevent loss of timing data.
Q: Can the PT724A control multiple circuits or relays?
A: The PT724A provides one relay output. For multi-circuit control, integrate multiple PT724A modules into your cabinet or consider a programmable logic controller (PLC) or networked access control system.
Q: What is the maximum load the relay can switch?
A: Relay contact ratings depend on the load type and circuit. Consult the product datasheet for maximum voltage and current specifications before wiring high-current solenoids or motors to the output.
Q: Is the PT724A compatible with my 24VDC access control panel?
A: Yes, the module accepts 24VDC input and produces a relay contact suitable for most panel-level integration. Verify your panel supports relay closure triggering and confirm terminal block wiring with the panel documentation.
Q: Can I reprogram the timer without removing the unit from the rack?
A: Physical control access depends on the mounting position and cabinet layout. Plan for accessible panel placement or allow for temporary removal if reprogramming cycles frequently.
Jerry TildsenPerspective based on aggregated IP Security Depot and affiliated engineering team experience.
The PT724A fills a specific gap in cabinet-level automation: when you need long-duration timing (365 days) without pulling in a networked system or PLC, this standalone relay module handles it reliably. Most integrators overlook the value until they're wiring a facility with legacy HVAC timers or a small-to-medium access control installation where a full VMS overkill.
Technical Highlights:
- 365-Day Programmable Range: Eliminates the need for external scheduler software or networked controller for annual cycles. Set it once during commissioning and it runs unattended for a full year.
- Dual Voltage Input (12/24 VDC & VAC): Compatibility across mixed cabinet power architectures means one stock unit covers both modern DC supplies and legacy transformer-fed enclosures—reduces inventory complexity in multi-site deployments.
- Battery-Backed Timing: Preserves schedule through power interruptions—essential for uninterruptible access or gate control where loss of timing creates operational or security gaps. Factor battery replacement into PM cycles.
Deployment Considerations:
- 24-hour programming resolution means you cannot trigger events at sub-hourly intervals. If a facility needs gate closure at 5:47 p.m., you'll need a PLC or networked timer instead.
- Single relay output limits this module to one circuit. Multi-circuit automation requires parallel PT724A units or a centralized controller—account for rack space and terminal block density if scaling.
- Battery depletion during extended power loss will eventually disable timing. Establish a battery health check in your preventative maintenance schedule, particularly in facilities with unreliable mains or frequent circuit resets.
The PT724A is the right choice for fixed-schedule gate cycles, seasonal HVAC shutdown (e.g., 10 p.m. weekday closure, 6 p.m. weekend), or recurring alarm trigger dates—places where the timing rules don't change month to month and network overhead isn't justified.
