Altronix SMP3CTX Compact Selectable 12/24VDC Power Supply
The Altronix SMP3CTX is a compact regulated power supply designed to deliver either 12VDC or 24VDC output at up to 2.5A, making it well-suited for access control readers, surveillance system auxiliaries, and backup power in small security installations. The unit accepts standard 115VAC or 220VAC input (selectable or auto-sensing depending on configuration), delivers a single isolated output, and fits into the compact BC300 enclosure format—allowing DIN rail or wall mounting in retrofit spaces where space is constrained. This flexibility matters: if you're retrofitting an existing panel or access control cabinet, you won't need to rework your enclosure layout.
Key Features
- Selectable Output Voltage (12VDC or 24VDC): Configuration at installation lets you match existing system voltage without stocking two SKUs. Particularly useful in mixed-voltage deployments where one supply can service either 12V readers or 24V solenoid locks depending on mounting location.
- Maximum Output Current: 2.5A: Supports up to 60W at 24V or 30W at 12V. Sufficient for single reader (typically 200–400mA) plus modest backup power or charging, but not for multiple high-draw devices on one supply—plan accordingly if you're powering a reader and a strike lock simultaneously.
- Dual AC Input Voltage: Accepts both 115VAC and 220VAC, eliminating the need for separate models in international or multi-region deployments. Reduces confusion during commissioning across sites with different mains standards.
- Single Isolated Output: One regulated output rail with isolation from input—standard for security-grade power distribution and reduces ground loop issues in long cable runs.
- BC300 Compact Enclosure: Industry-standard compact form factor designed for DIN rail mounting or wall surface mounting. Fits tight panel layouts and reduces cabinet clutter compared to full-size power supplies.
- Lifetime Limited Warranty: Manufacturer backs the unit for as long as you own it, reflecting confidence in the design. Check the formal warranty terms for exclusions (abuse, non-professional installation, etc.), but the backing is solid.
Integration and Deployment Context
The SMP3CTX integrates into any access control or surveillance system requiring 12 or 24VDC auxiliary power. Common uses include powering reader lock interfaces, door sensors, or small solenoid strikes in retrofit scenarios where a larger UPS or main supply panel is not installed. It is not a backup battery charger in the traditional sense—it is a regulated supply—but it can trickle-charge small backup batteries (confirm battery chemistry and charging profile compatibility separately). For critical 24/7 redundancy, pair it with a backup power system or UPS if mains outage tolerance is required.
The unit is designed for indoor, climate-controlled environments (offices, server rooms, secure closets). It does not carry an IP rating and is not suitable for outdoor or wet-location mounting without additional enclosure protection. If environmental hardening is needed, consult Altronix's environmental housing options or consider a ruggedized variant from the industrial access control power family.
When to Choose a Different Model
If you need multiple isolated outputs (e.g., one 12V rail and one 24V rail simultaneously), the SMP3CTX's single output won't suffice—look for a multi-output variant within the Altronix supply line. If maximum current demand exceeds 2.5A per rail, step up to a higher-amperage model. If backup/standby power is mandatory during mains loss, integrate a separate battery backup module or dedicated UPS rather than relying on the SMP3CTX alone.
Frequently Asked Questions
Q: Can the SMP3CTX power a door strike solenoid and a reader simultaneously?
A: Depends on current draw. A typical magnetic lock draws 500mA–1A at 24V; a reader draws 200–400mA. Together they exceed 2.5A, so no—you would need a dedicated supply per device or a higher-amperage model. Calculate your peak inrush current, not just steady-state.
Q: Is the output adjustable?
A: No. The SMP3CTX is a fixed-voltage supply with a selectable configuration (12 or 24VDC). Once set at installation, the output voltage is regulated but not field-adjustable. If fine voltage tuning is required, consult a variable-output Altronix model.
Q: What is the warranty coverage?
A: Lifetime Limited Warranty covers defects in materials and workmanship for as long as you own the unit. Read the full warranty documentation for exclusions (lightning damage, improper wiring, physical damage, etc.).
Q: Does it work with my access control panel?
A: Yes, if your panel requires 12 or 24VDC auxiliary power. The SMP3CTX is generic regulated power, not tied to any specific access control brand. Verify your panel's voltage requirement and maximum current draw before purchase.
Q: Can it be mounted vertically or in any orientation?
A: Standard DIN rail and wall-mount orientations are supported. For unusual orientations (upside-down, horizontal), check the datasheet for thermal airflow requirements. The BC300 enclosure is compact; ensure adequate ventilation regardless of mounting direction.
Q: Is it suitable for outdoor use?
A: No. The SMP3CTX lacks an IP rating and is designed for indoor, dry, climate-controlled environments. For outdoor power, choose an environmentally sealed model or add external enclosure protection.
Ted PerryPerspective based on aggregated IP Security Depot and affiliated engineering team experience.
The Altronix SMP3CTX is a straightforward, no-frills regulated supply that solves a specific problem: compact 12/24VDC power for access control readers, door sensors, and small solenoid locks in retrofit or space-constrained panel installations. The real value lies in its compact BC300 footprint and selectable voltage—you don't need to stock two SKUs or rework panel layouts.
Technical Highlights:
- Selectable 12/24VDC Output: Configure once at installation; no field adjustment required. Simplifies logistics when the same supply model must serve different voltage requirements across multiple sites.
- 2.5A Maximum Current: Sufficient for single-reader or low-load auxiliary circuits (60W at 24V, 30W at 12V). Don't attempt to parallel multiple high-draw devices (strike locks + readers + solenoids) on one rail—you will exceed capacity and trigger regulation dropout.
- Dual AC Input (115/220VAC): Eliminates regional power-supply variants. Particularly valuable in multi-country deployments or facilities with mixed mains standards, reducing commission-time confusion.
Deployment Considerations:
- The single isolated output means you cannot run both 12V and 24V loads simultaneously—only one voltage rail at a time. If you need true dual-voltage capability, specify a multi-output model from the Altronix catalog.
- This is not a battery charger or UPS. It is a regulated supply. If backup power is critical, integrate a separate battery backup module or UPS. The SMP3CTX alone will not survive a mains outage.
- Indoor and climate-controlled use only. No IP rating—water, dust, and temperature extremes will damage the unit. If the enclosure is exposed to industrial or outdoor conditions, you need additional environmental protection.
The SMP3CTX is best positioned for retrofit access control retrofits, small satellite readers in offices, or auxiliary power in secure-closet or server-room mounting scenarios where mains power is available, space is tight, and redundancy is handled by a separate system. It is not a solution for standalone, battery-backed outdoor access control—use a more rugged, integrated unit for that mission.
