Altronix AL400ULACM 8-Output Access Power Controller

Altronix AL400ULACM 8-Output Access Power Controller

The AL400ULACM is a purpose-built power distribution controller for multi-door access control installations. This unit accepts 115VAC input and converts it to either 12VDC @ 4A or 24VDC @ 3A (operator selectable), with integrated battery charger support for backup scenarios. It's UL Listed for access control deployments and designed to mount in the Altronix BC400 enclosure, making it a compact fit for distributed power architectures.

Key Features

• 8 fused Class 2 relay outputs — individual circuit protection on each channel prevents a single failed door strike or magnetic lock from cascading to other controlled devices. Each output is independently fused, so a short on one line doesn't black out the rest.
• Dual voltage operation (12VDC @ 4A or 24VDC @ 3A) — configure output voltage at installation to match your door hardware ecosystem. 12V supports lighter loads (credential readers, solenoids); 24V handles higher-current devices (heavy-duty magnetic locks, multi-point strikes) without needing separate supplies.
• 115VAC input — standard North American utility power, simplifying installation in most commercial and industrial facilities without requiring specialized wiring.
• Integrated battery charger — built-in charging logic supports backup battery banks (commonly used to maintain strike and lock power during mains failure). This eliminates the need for a separate charger module.
• UL Listed certification — meets electrical safety standards required by most building codes and insurance carriers for access control power distribution.
• BC400 enclosure compatibility — designed as a modular component within Altronix's access control ecosystem, enabling compact, stackable deployments in utility closets, electrical rooms, or distributed cabinets.

Integration & Compatibility

The AL400ULACM pairs with access control panels, card readers, and electromechanical locks that operate on 12VDC or 24VDC. Its relay outputs drive standard solenoid-type electric strikes and magnetic locks. The integrated battery charger supports lead-acid or gel-cell backup batteries commonly staged in access control architectures, preserving lock/strike power if the primary AC supply fails.

As part of the Altronix power supply line, this controller integrates with other distributed power components in multi-building or multi-floor access control systems. The fused relay outputs connect to door hardware via standard terminal blocks or field-wired connectors; no proprietary interfaces are required.

When to Choose a Different Model

If your installation requires only 2–4 controlled doors, or if you need integrated UPS functionality (battery backup built into the power supply itself rather than external), consider a smaller single-output Altronix supply. If you require AC output relays in addition to DC power, or need higher current delivery at a single voltage, compare specifications with other models in the Altronix access control power family. For applications demanding redundant power paths or rack-mount form factors, evaluate the full product portfolio against your facility footprint and failover requirements.

Deployment Considerations

Mount the AL400ULACM in a secure, climate-controlled enclosure (the BC400 is the standard choice). Ensure the 115VAC input is on a dedicated or lightly loaded circuit to avoid nuisance trips if door strikes draw inrush current. If you're adding backup battery support, verify the charger output current matches your battery chemistry and capacity rating — oversizing or undersizing battery banks can reduce charger lifespan. Test backup power failover before committing to production; run a mains-loss simulation to confirm strike/lock hold-up time meets your security requirements.

Frequently Asked Questions

Q: Can the AL400ULACM power both 12V and 24V devices simultaneously?

A: No. The output voltage is selectable at installation (12VDC @ 4A or 24VDC @ 3A) and applies to all 8 outputs together. If your installation mixes voltage requirements, you will need separate power supplies for each voltage family or a multioutput system with voltage-isolated channels.

Q: What happens if a door strike shorts and triggers its fuse?

A: The fuse on that individual output will blow, cutting power only to that specific door. The other 7 outputs remain operational, preserving access control on other doors while you service the failed strike. Replace the fuse to restore that channel.

Q: Does the AL400ULACM include backup batteries?

A: No. The unit provides integrated charging circuitry to charge external lead-acid or gel-cell backup batteries, but batteries must be procured and installed separately. The charger manages the charging cycle when AC mains are present; during mains failure, DC power is supplied from the battery to the relay outputs.

Q: Is the AL400ULACM suitable for outdoor installations?

A: The AL400ULACM itself is designed for indoor mounting within an enclosure (typically the BC400). It is not environmental-rated for direct outdoor exposure. The BC400 enclosure offers some IP protection, but for truly outdoor door hardware, route power from the controller to weather-sealed strike/lock housing via conduit or rated wiring channels.

Q: What is the maximum current draw across all 8 outputs?

A: Total output current is capped at the supply rating: 4A @ 12VDC or 3A @ 24VDC. This is the aggregate limit across all 8 channels combined, not per-channel. Plan your load distribution accordingly — if you have 8 identical door strikes, each can draw a maximum of 0.5A @ 12VDC.

Q: Is the AL400ULACM compatible with Altronix access control panels?

A: The AL400ULACM is designed as a power distribution component within Altronix's access control ecosystem and is compatible with standard access control panels and reader modules that accept 12VDC or 24VDC power and relay-controlled outputs. Consult your panel documentation to confirm relay-driven solenoid compatibility.

Ted Perry

Perspective based on aggregated IP Security Depot and affiliated engineering team experience.

The AL400ULACM is a practical workhorse for distributed access control architectures. Its 8 fused relay outputs are the key differentiator here — each output independently protected means you can deploy a single controller across a small to mid-size facility (multi-tenant office, warehouse with scattered dock doors, hospitality property with spread-out entrances) without cascading failures when hardware inevitably shorts or malfunctions.

Technical Highlights:

• 8 fused Class 2 relay outputs: Isolation between channels is rock-solid. A shorted strike on output 3 doesn't take down output 7. Fuse replacement is a 30-second field fix; you don't lose the entire building's access control while waiting for a tech call.
• Integrated battery charger: Built-in charging logic eliminates the need for a separate float charger module. Pair it with an external lead-acid or gel-cell battery bank, and you've got guaranteed backup power to magnetic locks and strikes during a mains failure — standard practice in modern access control to maintain egress and emergency unlock capability.
• Selectable 12VDC @ 4A or 24VDC @ 3A: Total power budget is modest by modern standards — about 48W @ 12V or 72W @ 24V. Right-size your door hardware accordingly. Heavy-duty magnetic locks pulling continuous 2A will eat most of the 24V budget, leaving limited headroom for readers or auxiliary devices.

Deployment Considerations:

• The voltage setting is fixed at the time of commissioning and applies to all 8 outputs. If you have a mix of 12V readers and 24V locks, this controller alone won't solve it — you'll need a second supply or a multioutput system with isolated channels.
• Total current across all 8 outputs is capped at the supply limit. If you have 8 doors with strikes that each draw 0.6A @ 12V, you'll exceed the 4A total and risk voltage sag or nuisance resets. Load-balance aggressively or step up to a higher-capacity supply.
• Mount the AL400ULACM in the BC400 enclosure and locate it near your access control panel in a climate-controlled room. Avoid placing it in a scorching electrical closet without ventilation; extended thermal stress shortens charger and relay lifespan.

Best fit: multi-door access control systems in office buildings, small industrial sites, or multi-tenant properties where you want a single, fused power distribution point and backup battery integration without the complexity of a full UPS. Skip it if you need redundant power paths, mixed-voltage outputs, or continuous power delivery exceeding 72W — those demand a more sophisticated platform.