Altronix T1DK3FA4D Dual-Voltage Power Supply with 4-Output Access Controller
Overview
The Altronix T1DK3FA4D is a UL294-listed, wall-mount power supply and access controller housed in a single steel enclosure — purpose-built for commercial door control installations that need clean, supervised power and independently switched lock outputs without adding a separate power distribution panel. The T1DK3FA4D delivers up to 6A continuous at either 12VDC or 24VDC (field-selectable), feeding four independently controlled PTC outputs rated at 1A each. That combination covers most four-door electric strike and mag-lock deployments from a single cabinet, without requiring a separate power booster or fuse block.
Key Features
- 12VDC or 24VDC Selectable Output: A single unit covers both 12V and 24V lock hardware — no need to stock separate models for different door hardware specs across a job site.
- 6A Continuous Maximum Output: Sustained 6A handles four active mag-locks or electric strikes simultaneously with overhead to spare. You're not sizing to peak inrush and hoping.
- Four Independent PTC-Protected Outputs at 1A each: Each door circuit is individually protected by a resettable PTC device. A fault on Door 3 doesn't pull down Doors 1, 2, and 4 — the affected output self-recovers once the fault clears, reducing truck rolls for nuisance trips.
- 9A Access Controller PTC: The controller-side aggregate PTC is rated at 9A, providing headroom above the 6A supply rating for transient conditions without nuisance trips on the controller board itself.
- AC Failure Supervision via Form C Contacts: Form C dry contacts allow your access control panel or monitoring system to receive a supervised alarm the moment mains power drops — not just an LED on the box. This is the difference between knowing about a power outage during an alarm event and finding out after the fact.
- Battery Supervision via Form C Contacts: A separate Form C output monitors battery health, so a dead standby battery doesn't go undetected until a real power failure exposes it.
- UL294 and CAN/ULC-S319-05 Listed: Both US and Canadian access control power supply listings are covered, which matters on cross-border projects or jobs governed by AHJ-specific code requirements.
- Operating Range 0°C to 49°C (with 85% RH tolerance): Designed for conditioned mechanical rooms and secure closets — not rated for outdoor or uncontrolled-temperature environments. Plan accordingly when selecting the install location.
Integration and Compatibility
The T1DK3FA4D is compatible with standard 12V and 24V electric strikes, magnetic locks, and fail-safe/fail-secure locking hardware from major door hardware manufacturers. The four independently switched outputs integrate directly with access control panels that provide relay outputs for door release — no relay expander required for a standard four-door configuration. The Form C supervision contacts connect to a monitored input on your access control panel or central station receiver. The enclosure ships at 15.5 lb. (18" x 14.5" x 4.62") and should be assessed for wall stud or backboard anchoring at installation — the 19.5 lb. shipping weight accounts for packing materials. Review your access control power supply requirements and the broader power supply catalog to confirm this unit matches your door count and current draw before specifying. For multi-door deployments, also consider pairing with a compatible access control panel that provides the relay outputs this unit expects. Integrators working on larger facilities should review the full Altronix product line for higher-channel and higher-amperage variants in the same enclosure family.
Frequently Asked Questions
Q: Can the T1DK3FA4D power both 12V and 24V devices at the same time?
A: No. The output voltage is field-selectable — either 12VDC or 24VDC — but not both simultaneously. All four outputs operate at the same selected voltage. Choose the voltage that matches your lock hardware before installation.
Q: What happens if one of the four door outputs develops a short or overcurrent fault?
A: Each output is protected by an independent resettable PTC device. A fault on one output will trip that circuit without affecting the other three. Once the fault clears, the PTC resets automatically — no fuse replacement required.
Q: Is the T1DK3FA4D UL listed for access control power supply applications?
A: Yes. The T1DK3FA4D carries UL294 listing (US) and CAN/ULC-S319-05 listing (Canada), covering access control power supply requirements in both markets.
Q: Does the T1DK3FA4D support battery backup?
A: The unit includes battery supervision via Form C contacts, indicating battery monitoring circuitry is present. Consult the Altronix installation manual for battery specifications and backup runtime calculations based on your connected load.
Q: What are the enclosure dimensions and mounting requirements?
A: The enclosure measures 18" x 14.5" x 4.62" and weighs 15.5 lb. Wall mounting to solid blocking, studs, or a plywood backboard is recommended given the weight. Allow clearance for wiring access based on your conduit routing.
Q: What is the maximum ambient temperature for the T1DK3FA4D?
A: The operating temperature range is 0°C to 49°C (32°F to 120°F). This unit is intended for climate-controlled or semi-conditioned spaces — mechanical rooms, IT closets, or secure equipment rooms. It is not rated for outdoor or uncontrolled-temperature enclosures.
The T1DK3FA4D is the unit I reach for on standard commercial four-door jobs where the AHJ requires UL294-listed power and the integrator wants supervised AC and battery monitoring in a single enclosure. The 6A continuous rating at selectable 12VDC or 24VDC means you can standardize on one SKU across jobs even when door hardware voltages differ between sites.
Technical Highlights:
- Independent 1A PTC Outputs: Four resettable PTC outputs mean a wiring fault at one door self-isolates — no manual fuse swap, no waiting for a tech to clear the panel, and the other three doors stay operational while you troubleshoot.
- Dual Form C Supervision Contacts: Separate Form C contacts for AC failure and battery condition give your monitoring panel two distinct alarm points. Mains drops and battery degradation each generate their own supervised signal — granular enough for central station reporting.
- UL294 and CAN/ULC-S319-05: Dual listing covers both US and Canadian code requirements from a single installed unit. On multi-province or cross-border projects, that removes a line-item substitution conversation with the AHJ.
Deployment Considerations:
- At 15.5 lb. and 18" x 14.5" x 4.62", this enclosure needs proper wall anchoring — plywood backboard or stud mount, not drywall anchors. Factor conduit knockout access into your mounting location choice before the electrician rough-ins.
- The 49°C upper operating limit is tighter than some competing units. If the equipment room runs hot in summer (server exhaust, poor HVAC), verify ambient temperature before specifying — thermal shutdown in a live facility is a difficult conversation.
This unit fits cleanly in commercial office, education, and light healthcare four-door deployments where UL294 listing is mandatory, door hardware is standardized at one voltage, and the integrator wants supervised power monitoring without a separate distribution module.
