Altronix T3AXK77F16SD 16-Door PTC-Protected Access Control Power System
Overview
The Altronix T3AXK77F16SD is a large-format, multi-door access control power enclosure designed for enterprise and campus-scale deployments where you need centralized, protected power distribution across 16 access points in a single cabinet. Combining a 24VDC/10A power supply with PTC-protected networked dual input/output modules, 12VDC voltage regulation, and a 12AH battery backup — all inside a substantial 36.12" x 30.125" x 7.06" steel enclosure — the T3AXK77F16SD eliminates the patchwork of individual door power supplies that creates maintenance headaches and complicates troubleshooting in large facilities.
Built to work alongside Altronix access control power solutions, this system reflects Altronix's approach of integrating Axis access control hardware with centralized power architecture. If you're specifying a large facility with a single-rack or single-closet power distribution philosophy, this is the kind of unit that keeps installs clean and auditable.
Key Features
- 24VDC / 10A Power Supply: A 10-amp output at 24VDC gives you sufficient headroom to power 16 networked door modules simultaneously without running separate transformer circuits to each closet. That consolidation alone cuts labor and conduit runs on large jobs.
- PTC-Protected Networked Dual Input/Output Modules: Positive Temperature Coefficient (PTC) resettable protection means a shorted lock or reader won't blow a fuse that requires someone to physically reset it. The circuit self-recovers once the fault clears — relevant on large sites where dispatching a technician to swap a fuse in a remote IDF is a real cost.
- 12VDC Voltage Regulator Output: Onboard 12VDC regulation means you can power 12V readers, REX devices, and electric strikes directly from this unit without adding external regulators. Reduces component count and potential failure points at the panel level.
- Dual-Voltage Distribution (12VDC and/or 24VDC): The power distribution module delivers either 12VDC or 24VDC outputs, giving integrators flexibility to support mixed-voltage door hardware within the same enclosure — useful when a facility standardizes on Altronix modules but has legacy 12V hardware at some doors.
- 12AH / 12VDC Battery Backup: A 12 amp-hour battery provides meaningful standby time during a power outage. For a single-reader, low-draw door configuration, 12AH can sustain operation for several hours — keeping controlled-access doors functional without a generator cut-in. Size your battery runtime expectation against the actual load of your specific door hardware.
- 84.2 lb Fully-Integrated Enclosure: At 36.12" x 30.125" x 7.06", this is a two-person lift and requires pre-planned wall anchoring. The weight reflects a fully-integrated steel enclosure with all modules, the battery, and distribution hardware included — not a stripped chassis requiring field assembly of components.
- 0°C to 49°C Operating Range: Rated for standard conditioned equipment rooms and secure closets. If your installation goes into an unconditioned mechanical space or a rooftop enclosure that swings above 49°C in summer, you'll need to spec a different solution or ensure environmental controls are in place.
- CE European Conformity Listed: CE listing confirms the unit meets applicable European directives, which matters for multi-region enterprise deployments or compliance documentation requirements.
Integration & Compatibility
The T3AXK77F16SD is engineered as part of the Altronix/Axis integrated access control ecosystem, pairing with Axis network door controllers and compatible access control systems. The PTC-protected dual input/output module architecture aligns with Axis controller wiring conventions, which reduces integration complexity when both power and control hardware come from a pre-validated combination. Verify your specific Axis controller model and firmware against Altronix's compatibility documentation before committing to a panel layout — particularly if you're running extended cable runs where voltage drop at 12VDC becomes a factor. For broader system planning, consult a centralized infrastructure guide or your PoE switching architecture when designing alongside IP-based door controllers. For installations requiring additional coverage or accessories, review the range of access control power supplies in this category.
Frequently Asked Questions
Q: How many doors can the T3AXK77F16SD support?
A: The T3AXK77F16SD is configured for 16 access points using PTC-protected networked dual input/output modules. Actual door count per module depends on your specific hardware configuration — verify your door controller and lock types against Altronix's module documentation.
Q: What voltages does the T3AXK77F16SD distribute to field hardware?
A: The power distribution module delivers 12VDC and/or 24VDC outputs. An onboard 12VDC voltage regulator provides regulated 12V for readers and devices requiring stable voltage. The primary power supply operates at 24VDC / 10A.
Q: What size is the battery backup included in the T3AXK77F16SD?
A: The unit includes a 12AH / 12VDC battery. Actual standby runtime depends on the total current draw of connected door hardware — calculate your load per door before estimating backup duration.
Q: What are the enclosure dimensions and weight for the T3AXK77F16SD?
A: The enclosure measures 36.12" x 30.125" x 7.06" and weighs 84.2 lb. Plan for two-person installation and confirm your wall or rack can support the load before mounting.
Q: What is the operating temperature range of the T3AXK77F16SD?
A: The unit is rated for 0°C to 49°C (32°F to 120°F) operating temperature. It should be installed in a conditioned equipment room or secure closet — unconditioned spaces that exceed 49°C in summer require additional environmental controls.
Q: Is the T3AXK77F16SD CE certified?
A: Yes, the T3AXK77F16SD carries CE European Conformity listing, which is relevant for multi-region deployments or projects requiring compliance documentation under applicable European directives.
The T3AXK77F16SD is the unit I reach for when a customer needs to consolidate 16 access points into a single, maintainable power distribution cabinet without running individual power supplies to each door. The 24VDC / 10A supply paired with PTC-protected modules is a fundamentally sound architecture for large-facility installs — the self-resetting overcurrent protection on each output is one of those features that pays for itself the first time a door hardware fault trips at 2 a.m. on a site without local staff.
Technical Highlights:
- PTC Resettable Protection: Unlike fused outputs that require a physical swap, PTC protection self-recovers after a fault clears — critical for remote IDF closets where a truck roll to reset a fuse is a real operational cost.
- Dual-Voltage Distribution (12VDC and/or 24VDC): Being able to serve both 12V and 24V door hardware from one enclosure is a genuine advantage when a facility has mixed-vintage hardware or is mid-migration between voltage standards.
- 12AH Battery at 84.2 lb Fully Integrated: The weight tells you everything's included — battery, modules, distribution hardware. There's no field-assembly guesswork, and the 12AH reserve provides meaningful standby time if you've sized your per-door load conservatively.
Deployment Considerations:
- At 84.2 lb and 36.12" x 30.125" x 7.06", this is a two-person wall mount — confirm your stud spacing and wall material before the install date, not during it. Pre-drill and anchor templates save time on large jobs where multiple units go up the same day.
- The 49°C operating ceiling is a hard limit — any equipment closet that lacks cooling or sits adjacent to heat-generating equipment in summer needs to be audited before this unit goes in. Storage is rated to 70°C, but the operating spec governs.
The T3AXK77F16SD fits best in enterprise campus or large commercial builds where the access control design calls for centralized power distribution in a single IDF per floor — multi-building education facilities, corporate headquarters, and healthcare campuses running 12–16 controlled doors per closet are the scenarios where this unit's consolidation payoff is clearest.
