Altronix LPS3C12X 12VDC Linear Power Supply with Battery Backup
The Altronix LPS3C12X is a 115VAC-to-12VDC linear power supply rated for 2.5A continuous output, designed to serve as the backbone power and battery-charging unit for small-to-medium access control and security system installations. Linear regulation—as opposed to switching supplies—delivers cleaner, lower-noise 12VDC output, which matters when you're powering sensitive control logic or door strike hardware that can be noise-sensitive. The unit integrates battery backup supervision and charging functionality directly into the enclosure, eliminating the need for a separate charger and simplifying cabinet wiring.
Key Features
- 2.5A Continuous Output: Sufficient headroom to power a small cluster of door locks, card readers, and alarm panel backup simultaneously without strain. At 2.5A, you have roughly 30W of available power—enough for 2–3 electric strike locks (typically 0.5–1.5A each) plus monitoring electronics, without cascading voltage sag under load.
- Linear Regulation: Generates minimal electrical noise compared to switching supplies, reducing the risk of false triggers in sensitive alarm circuits or interference with adjacent low-voltage signaling lines.
- Integrated Battery Backup and Charging: Built-in charging circuitry supervises and maintains a backup battery (typically a 12V sealed lead-acid or gel cell) without requiring external charger hardware. This keeps your cabinet footprint smaller and reduces part count.
- AC Fail Supervision: Detects mains power loss in real time and can be monitored via a relay contact or digital signal to a central panel or building management system. Critical for alerting facilities teams to power faults before backup capacity is exhausted.
- Low Battery Supervision: Monitors the backup battery's voltage and signals when charge is depleted. Prevents nuisance lockouts caused by a failed battery going unnoticed.
- Compact Enclosure (12″H × 8″W × 6″D): Fits into most wall-mounted or cabinet-mounted access control housings without requiring a dedicated rack or large external footprint. Ideal for retrofit installations where space is constrained.
- Single 12VDC Output: One main output channel means all load devices share a common power distribution rail, simplifying troubleshooting and eliminating complexity of multi-output current management.
Integration & Compatibility
The LPS3C12X is a general-purpose power infrastructure component and works with any 12VDC security or access control device—door locks, card readers, alarm panels, and motion sensors. Because it supplies unregulated 12VDC (not PoE or specialized signaling), integration is straightforward: wire the output terminals to your load distribution block and run standard 2-pair or multi-pair DC power cable to your end devices. AC Fail and Low Battery supervisor outputs are typically wired to zone inputs on an alarm panel or sent to a building automation system via relay contacts.
The unit is well-suited to small deployments—single-building access control systems, standalone door lock power, or as part of a larger networked security infrastructure where local 12VDC backup is needed alongside IP cameras and recorders.
Deployment Considerations
Choose the LPS3C12X when you need true backup power (battery support) and low-noise DC regulation in a compact form factor. If your requirement is power-only without battery supervision, a simpler, cheaper non-backup supply may suffice. The 2.5A limit means this is not designed for large multi-door access control systems—if you have five or more strike locks or a complex reader matrix, consider a higher-capacity regulated power supply in the Altronix line or a dedicated UPS module.
Linear supplies also generate more heat than switching types, so ensure adequate enclosure ventilation if the unit will run continuously in an unventilated cabinet. Finally, the single output means all devices draw from one fuse or circuit protection point—a fault in any load can potentially affect the entire branch unless you add downstream fusing at each device.
Frequently Asked Questions
Q: What battery capacity does the LPS3C12X support?
A: The unit is designed to charge and supervise a standard 12VDC sealed lead-acid or gel cell battery. Typical installations use 4–12Ah batteries, depending on how long backup runtime is needed. The LPS3C12X itself does not include a battery—it provides the charging and monitoring hardware.
Q: Can the LPS3C12X power multiple door strikes simultaneously?
A: Yes, within limits. A typical electric strike draws 0.5–1.5A under lock. At 2.5A total output, you can safely power 2 strikes at full current plus a card reader and sensor wiring. For 3 or more simultaneous strikes, you risk voltage sag and nuisance unlocks—a higher-capacity supply is recommended.
Q: What does AC Fail supervision do?
A: AC Fail monitors the input mains voltage and closes (or opens) a relay contact when 115VAC is lost. This contact can be wired to an alarm panel zone or sent to a monitoring station, alerting you that the primary power has failed and the system is running on backup battery. Without this signal, a power outage could go unnoticed until the battery is depleted.
Q: Does the LPS3C12X require a separate battery charger?
A: No. The charging circuitry is integrated into the unit. As long as 115VAC mains power is present, the LPS3C12X automatically maintains the backup battery at full charge. You do not need an external charger.
Q: What is the warranty?
A: Altronix provides a Lifetime Limited Warranty on this unit, covering defects in materials and workmanship. Consult the manufacturer documentation for specific terms and coverage exclusions.
Q: Can I use the LPS3C12X in a weather-sealed outdoor enclosure?
A: The LPS3C12X itself is rated for indoor/cabinet use. If deployed outdoors, it must be housed in a thermally ventilated weatherproof enclosure to prevent overheating and condensation damage. Ensure the cabinet has adequate airflow to dissipate the heat generated by the linear regulator.
Ted PerryPerspective based on aggregated IP Security Depot and affiliated engineering team experience.
I've specified the Altronix LPS3C12X on a dozen small-footprint access control deployments, and the integrated battery backup supervision is the genuine win here. Most integrators buy a basic power supply and add chargers and monitoring piecemeal; the LPS3C12X bundles that into one 12″ × 8″ × 6″ box with automatic AC Fail and Low Battery relay contacts baked in. That keeps your cabinet wiring clean and gives you out-of-the-box notification of power faults—no extra supervision module required.
Technical Highlights:
- 2.5A Linear Output: Low-noise 12VDC regulation ensures card readers and strike logic don't chatter under load. A switching supply at this wattage would save heat, but the cleaner output is worth it for sensitive access control electronics.
- Integrated Battery Charging: One enclosure powers and maintains backup capacity automatically. No external charger means fewer part numbers, less cabinet clutter, and no risk of forgetting to connect a charger on a service call.
- AC Fail + Low Battery Supervision: Both relay contacts let you wire alerts directly to an alarm panel or send them upstream to a BMS. You're not flying blind when mains power drops—you'll know immediately and can trigger a page or log entry.
Deployment Considerations:
- The 2.5A limit is real. Size your load carefully: two electric strikes plus a reader cluster works; five locks does not. Exceeding 2.5A will cause voltage sag, nuisance unlocks, and reader timeouts.
- Linear regulation generates measurable heat. If you're deploying this in a sealed electrical closet without HVAC, you'll need active ventilation or the supply will throttle itself or fail prematurely.
Deploy the LPS3C12X on single-building or multi-site access control systems where you need uninterrupted power and local battery backup in a compact, self-contained package. This is also a solid choice for small alarm panel backups or as part of a distributed power architecture where each door controller gets its own supervised 12VDC. Skip it if you have more than 2–3 simultaneous high-current loads or if you're looking for a quiet switching supply in a larger power class.
