Altronix T2AGK78SD 8-Output 24VAC Access Control Power Supply

Overview

The Altronix T2AGK78SD is a purpose-built 24VAC power distribution unit delivering 10A across 8 independently protected outputs — sized for multi-door AMAG access control installations where clean, code-compliant power matters as much as the hardware it feeds. At 240VA total capacity, this unit carries the load of a mid-size door controller deployment without relying on field-improvised power splits or daisy-chained supplies that introduce ground loops and void system warranties.

Engineered for the Altronix ALTX/AMAG platform, the T2AGK78SD sits in the category of access control power supplies where predictable voltage and per-output protection are the design criteria — not afterthoughts. If you've commissioning a multi-reader installation and need to budget your power distribution, start here.

Key Features

• 8 Independent 24VAC Outputs: Eight discrete outputs let you assign one circuit per door, reader, or lock — so a fault on door 3 doesn't cascade and drop the entire panel. That isolation is the operational reason to use a purpose-built distribution unit rather than a single high-current tap.
• 10A / 240VA Total Capacity: At 10 amps on 24VAC, you have 240VA available across the eight outputs — roughly 30VA per output if loaded evenly. Real-world AMAG multi-door deployments rarely load evenly, but 240VA gives you headroom to handle mag-lock inrush without the supply sagging under transient demand.
• PTC Overcurrent Protection: Positive Temperature Coefficient (PTC) resettable fusing on each output means a shorted lock or miswired reader trips that circuit automatically and resets when the fault clears — no blown fuses to swap on a service call at 2 a.m., no tools required. This is the correct protection scheme for access control circuits that need to self-recover after a transient fault.
• 115VAC Input: Standard North American mains input — no step-down transformer, no special circuit required. Wire it to a standard 15A or 20A branch circuit and you're done on the input side.
• ALTX/AMAG Integration: The T2AGK78SD is factory-configured for the ALTX/AMAG access control ecosystem. Voltage, output count, and protection scheme are matched to the controller's power expectations, which reduces commissioning time and eliminates the compatibility guesswork you'd face with a generic supply.
• Dedicated Per-Door Power Architecture: Rather than running one high-current output back to a field splice, each of the 8 outputs runs a clean, individually protected circuit. For multi-door access control deployments, this architecture simplifies troubleshooting — a voltmeter on any output immediately tells you if that circuit is live and within spec.

Integration & Compatibility

The T2AGK78SD is designed for ALTX/AMAG multi-door access control systems operating on 24VAC. If your installation uses a different voltage (12VDC or 24VDC panels, for example), this is not the correct supply — verify your controller's input voltage requirement before ordering. For larger deployments requiring more than 8 outputs or higher total current, review the broader Altronix power distribution line for higher-capacity variants. When planning your power budget, account for mag-lock inrush (typically 2–3× steady-state current at energize) against the 10A total — eight fully loaded mag-lock outputs may approach the supply's ceiling under simultaneous door-release events.

A well-planned installation pairs this unit with a quality UPS or battery backup — Altronix offers integrated battery management options worth considering for any installation where door access must survive a mains outage. See the access control accessories category for compatible battery and enclosure options.

Frequently Asked Questions

Q: What is the output voltage of the T2AGK78SD?

A: The T2AGK78SD outputs 24VAC across all 8 outputs. Total output capacity is 10A / 240VA.

Q: What type of overcurrent protection does the T2AGK78SD use?

A: PTC (Positive Temperature Coefficient) resettable protection is used on each output. PTC devices trip on overcurrent and reset automatically once the fault clears — no fuse replacement is needed.

Q: How many doors can the T2AGK78SD support?

A: The unit provides 8 independent outputs. In a one-output-per-door architecture, it supports up to 8 doors. Actual door count depends on the power draw of each lock and reader; verify your per-door load against the 10A total before finalizing your design.

Q: What is the input voltage requirement for the T2AGK78SD?

A: The T2AGK78SD requires 115VAC input — standard North American mains. No special transformer or circuit is required beyond a standard 15A or 20A branch circuit.

Q: Is the T2AGK78SD compatible with systems other than AMAG?

A: The T2AGK78SD is factory-configured for the Altronix ALTX/AMAG platform. It delivers 24VAC, which is compatible with other 24VAC access control hardware in principle, but the unit is optimized and warranted for use within the ALTX/AMAG ecosystem. Consult your system documentation before using it with other controllers.

Q: Can I expand beyond 8 outputs if my installation grows?

A: The T2AGK78SD is fixed at 8 outputs and 10A. For larger installations, Altronix offers higher-output power distribution units in the same ALTX series — select the variant that matches your door count and total current budget.

Ted Perry

The T2AGK78SD's PTC resettable protection per output is the spec I look at first on any Altronix access control supply — it means a wiring fault at one door doesn't take down adjacent circuits and doesn't require a technician on-site to reset. For an 8-door AMAG deployment, that operational resilience justifies the unit over a cheaper generic supply almost immediately.

Technical Highlights:

• 240VA / 10A Total Output: Distributed across 8 outputs, this gives roughly 30VA per circuit under even loading — sufficient for most 24VAC mag-lock and reader combinations, but plan your inrush budget if you're running high-current locks on multiple doors simultaneously.
• PTC Per-Output Protection: Self-resetting overcurrent protection eliminates service calls for blown fuses. Each output trips independently, so a miswired lock on output 5 doesn't affect outputs 1–4 or 6–8.
• 115VAC Input: No transformer, no special circuit — drops into a standard North American electrical panel on a 15A or 20A branch circuit, which simplifies the electrical rough-in significantly on new construction sites.

Deployment Considerations:

• Run a load calculation before commissioning: 8 outputs × average mag-lock draw (typically 500mA–1A steady-state) lands well inside the 10A rating at steady state, but simultaneous door-release events create inrush that can approach the supply ceiling. Stagger release timing in the AMAG controller if your installation is densely loaded.
• This unit outputs 24VAC — not 24VDC. Verify your locks, readers, and controller inputs are rated for AC before wiring. Applying 24VAC to a DC-only device will damage it and won't trip the PTC because the fault may not draw overcurrent immediately.

The T2AGK78SD is the right unit for an AMAG-based 8-door deployment where you need clean per-circuit isolation and self-recovering fault protection — a corporate campus secondary entrance cluster or a mid-size commercial building's interior door suite are the deployments where this unit earns its place.