Altronix SMP5PMCTX 12VDC Supervised Power Supply Charger
The Altronix SMP5PMCTX is a single-output, supervised 12VDC power supply rated at 4A maximum output, designed for security and access control deployments where fault notification and battery backup are essential. This unit combines regulated power delivery with integrated battery charging and supervision — meaning it monitors AC availability and battery condition, then signals problems downstream to your alarm or control panel.
Key Features
- 4A @ 12VDC output capacity: Sufficient to power a typical electronic door lock (2–3A), mag lock (1–2A), plus additional low-draw devices like card readers or status lights. Do not attempt to run multiple high-current loads (e.g., two mag locks) from a single unit — use separate supplies or larger capacity models in the Altronix line.
- Supervised operation with AC fail and low battery alarms: Built-in relay contacts signal AC mains loss and depleted battery condition to your panel or control system, enabling real-time alerts. Critical for access control and alarm systems where you need to know when backup power is degraded.
- Integrated battery charger and backup: Maintains a connected 12VDC battery (size and type per datasheet) and automatically switches to backup power during AC outages. Keeps door locks and readers energized when mains fails, preventing lockout scenarios.
- Universal input voltage (115/230VAC): Operates from either North American (115VAC 60Hz) or international (230VAC 50Hz) mains without manual configuration. Simplifies logistics for integrators supporting multiple facilities or regions.
- Regulated 12VDC single output: Clean, stable voltage with onboard filtering and regulation. Reduces compatibility issues with sensitive access control electronics and eliminates the need for downstream voltage conditioning.
- CE certified: Meets relevant European EMC and safety directives. Sufficient for EU market deployment; verify additional certifications (FCC, UL, RoHS) from the manufacturer datasheet if required for your jurisdiction or end-customer specifications.
- Lifetime Limited Warranty: Altronix backs the unit with a manufacturer's lifetime limited warranty, covering defects in materials and workmanship. Standard limitations apply (damage from misuse, incorrect voltage, environmental abuse).
Integration & Compatibility
The SMP5PMCTX works in any 12VDC security ecosystem: access control readers, electronic locks, credential dispensers, small networked cameras, and alarm system backup supplies. Supervision outputs (AC fail, low battery) connect to standard dry-relay inputs on control panels, so no special modules or firmware are required. Wire output and alarm contacts per your panel's terminal block specifications — typical residential/commercial access control panels support this integration natively.
When to Choose a Different Model
If you need higher current capacity (8A or more), consider larger Altronix supervised supplies in the SMP series. If your application requires multiple independent 12VDC outputs (e.g., separate power rails for different door zones), look for multi-output supervised supplies. If battery backup is not required, simpler non-supervised 12VDC supplies will cost less but sacrifice fault notification and automatic mains switchover.
Deployment Considerations
Plan for adequate battery capacity external to the SMP5PMCTX — the unit charges and supervises but does not contain the battery internally. Locate the supply near your load (lock, reader, panel) to minimize voltage drop across long wire runs; each amp of current over 100 feet of 18AWG wire will drop roughly 2V, which may degrade lock performance. Test battery runtime under actual load conditions before final commissioning — a typical 12V 7Ah SLA battery will back up a 2A lock for 3–4 hours, depending on discharge curve and temperature.
Frequently Asked Questions
Q: Can the SMP5PMCTX power a mag lock and an electronic strike simultaneously?
A: Depends on their current draw. A typical mag lock draws 1.5–2A and a strike draws 0.5–1A. In parallel, you could reach 3–3.5A briefly, but sustained dual operation near 4A will heat the supply. Size according to your actual worst-case simultaneous draw; if uncertain, use separate supplies.
Q: What happens if the AC fails and the battery is depleted?
A: The low battery alarm output activates, signaling the control panel that backup power is exhausted. All 12VDC loads will drop offline. Your door locks will de-energize (fail-safe or fail-secure depending on the lock configuration). Plan battery capacity and maintenance to prevent this scenario.
Q: Does the SMP5PMCTX work with my access control panel?
A: Yes, if your panel accepts 12VDC input and has standard dry-relay alarm inputs for AC fail and low battery signals. Nearly all commercial access panels support this. Consult your panel's wiring diagram to verify alarm input availability.
Q: How often should I replace the backup battery?
A: Most SLA (sealed lead-acid) batteries remain serviceable 3–5 years in trickle-charge applications. Test under load annually. Replace if runtime drops below 50% of original capacity, or every 4 years as preventive maintenance in critical installations.
Q: Is the SMP5PMCTX UL or FCC listed?
A: The unit is CE certified for European markets. Consult the datasheet or Altronix directly for UL, FCC, or other regional certifications if required for your deployment.
Q: What is the maximum wire gauge and distance to my loads?
A: Use 12AWG or heavier for runs under 50 feet at full 4A load. For longer runs or higher current, drop to 10AWG. Calculate voltage drop as (2 × distance × load current) / 1000 and select wire to keep loss below 3% (0.4V at 12V).
Ted PerryPerspective based on aggregated IP Security Depot and affiliated engineering team experience.
The Altronix SMP5PMCTX sits at a critical junction in access control infrastructure — it's the box that keeps your locks powered when the utility company fails. The 4A output and supervised dual alarms (AC fail, low battery) are not luxuries; they're the minimum requirements for professional installations where downtime and false alarms translate to cost and liability.
Technical Highlights:
- 4A @ 12VDC: Covers a single high-current load (mag lock, 2A) plus ancillary devices (reader, 0.5A; relay, 0.5A) with headroom. Do not assume you can run two mag locks — you'll thermal-limit the supply under sustained draw and risk automatic shutdown.
- AC fail and low battery supervision: Dual relay outputs directly interface your control panel's alarm inputs. Real-time fault notification prevents silent power loss scenarios. Without supervision, a failed AC supply or degraded battery remains invisible until someone tries to unlock a door and it fails mechanically.
- Universal 115/230VAC input: No manual voltage selection or region-specific units to stock. Deploy the same SKU in New York (115V 60Hz), Frankfurt (230V 50Hz), or Tokyo (100V 50Hz) — the SMP5PMCTX auto-selects input voltage. Reduces spare inventory and simplifies logistics.
- Integrated battery charger: Float-charge topology keeps external SLA batteries healthy. Most access control installations run a 12V 7–17Ah SLA; the SMP5PMCTX will maintain it indefinitely on AC mains and seamlessly transition to backup when AC fails. No separate charger module needed.
Deployment Considerations:
- Battery capacity is external and your responsibility. A 12V 7Ah SLA will back up a 2A mag lock for roughly 3–4 hours. Larger installations (multiple doors, 24/7 operation) require 17–24Ah batteries and may necessitate multiple SMP5PMCTX units on separate circuits to avoid overload and battery depletion.
- Voltage drop over distance kills performance silently. At 4A over 100 feet of 18AWG wire, you lose ~2V. Your 12VDC lock sees 10V and becomes sluggish or non-functional. Run thicker wire (12AWG minimum for runs over 50 feet) and calculate drop before final installation.
- CE certification is stated but verify UL/FCC compliance directly with the manufacturer if your facility requires North American or additional regional approvals. This is not a showstopper, only a paperwork trail you must confirm.
The SMP5PMCTX is the right choice for small-to-medium access control deployments (1–4 doors, single-zone power) where supervised backup and fault notification are non-negotiable. For larger multi-door or multi-supply architectures, plan for multiple units or evaluate higher-capacity supervised supplies in the Altronix catalog.
