Altronix AL125ULP Dual Output 12/24VDC Power Supply
The Altronix AL125ULP is a compact AC/DC power supply designed for small-scale security infrastructure requiring flexible voltage configuration across two independent channels. This unit accepts 24VAC input and converts it to selectable 12VDC or 24VDC output on each channel, making it suitable for mixed-voltage deployments without requiring separate dedicated supplies. The UL-listed construction and PTC-protected outputs mean you're working with a component built to UL standards with current-limiting protection on each channel—a practical safeguard against overload conditions in retrofit and integration scenarios.
Key Features
- Dual independent PTC outputs: Two separate channels, each with individual PTC (Positive Temperature Coefficient) current limiting. This means each channel protects itself independently if a connected device draws excessive current—no single fault takes down both outputs. Particularly useful in access control systems where one reader circuit should not compromise power to another.
- Selectable 12VDC or 24VDC per channel: Configure each output independently without hardware changes. Enables you to power legacy 12V devices alongside newer 24V equipment in the same enclosure, eliminating the need for separate supplies or external voltage converters.
- 1A maximum current per output: Each channel delivers up to 1A, totaling up to 2A aggregate draw across both channels. This capacity handles small auxiliary devices—door strikes, readers, relay modules, compact camera backup circuits—but not high-load aggregates. Verify device draw before committing to this supply in your architecture.
- 24VAC input requirement: The AL125ULP requires 24VAC mains input, which must already be present in your infrastructure. If you're running on 110-240VAC mains only, you'll need an upstream 24VAC transformer or dedicated 24VAC distribution already in place.
- Compact form factor: Small physical footprint fits into retrofit enclosures, DIN-rail mounting scenarios, and OEM integration without consuming excessive space. A practical consideration if you're retrofitting systems into existing access control cabinets or security appliances.
- UL Listed construction: UL listing confirms the unit meets electrical safety standards for North American deployment. This matters for code compliance in commercial installations and integrations requiring documented safety approvals.
Integration & Compatibility
The AL125ULP fits naturally into access control systems requiring dual voltage outputs, small-scale camera power distribution with voltage selection capabilities, and auxiliary powered security device backup circuits. Because it provides independent selectable outputs, it works well in hybrid environments where 12V legacy readers or sensors operate alongside newer 24V devices. The PTC protection on each channel means you can wire multiple low-current loads per output without managing external fuses for each device—the supply itself limits current to 1A per channel.
What's in the Box
Package contents are not specified in available documentation. Contact the manufacturer or your vendor for exact included accessories.
Frequently Asked Questions
Q: What 24VAC transformer or distribution do I need to power the AL125ULP?
A: The AL125ULP requires 24VAC mains input. Confirm your infrastructure already supplies 24VAC to the enclosure or location where you plan to install this supply. If you have only 110-240VAC available, you will need an upstream 24VAC transformer.
Q: Can I use both outputs simultaneously at full 1A each?
A: Yes. Each output is independently rated at 1A maximum, for a total aggregate draw of up to 2A across both channels. Size your connected devices accordingly.
Q: Does the AL125ULP include wall-mount or DIN-rail hardware?
A: Mounting hardware details are not specified in the available documentation. Confirm with your vendor or the manufacturer whether mounting brackets are included or must be purchased separately.
Q: Is the AL125ULP suitable for camera power backup circuits?
A: The AL125ULP can support backup power for small camera circuits or auxiliary powered security devices, but only within its 1A per channel limit. Confirm your camera or device draw before deploying; most professional IP cameras draw far more than 1A and require dedicated larger supplies or PoE infrastructure.
Q: What is the warranty coverage for the AL125ULP?
A: The unit carries a Lifetime Limited Warranty from Altronix. Review the warranty terms with your vendor or the manufacturer for specific coverage details and claim procedures.
Q: Can I configure one output as 12VDC and the other as 24VDC simultaneously?
A: Yes. Each channel is independently selectable, allowing asymmetric voltage configuration. This makes the AL125ULP practical for mixed-voltage legacy and modern equipment in the same enclosure.
Ted PerryPerspective based on aggregated IP Security Depot and affiliated engineering team experience.
The Altronix AL125ULP hits a specific niche: mixed-voltage access control and auxiliary power in retrofit scenarios where you've got legacy 12V readers or sensors running alongside newer 24V components. The dual independent PTC outputs and per-channel voltage selection eliminate the need to buy two separate supplies and rewire your enclosure. That said, understand the 1A per-channel ceiling—this is not a general-purpose power supply for camera racks or high-load applications.
Technical Highlights:
- Independent PTC current limiting per output: Each channel protects itself to 1A without external fusing, simplifying wiring in compact access control cabinets where fault isolation matters. One short doesn't cascade to kill the other channel.
- Selectable 12VDC or 24VDC per channel: Eliminates the need for separate supplies when managing mixed legacy and modern devices—real time-saver during retrofit work or when integrating older readers with newer 24V strike hardware.
- 24VAC input requirement: The supply does no conversion from mains voltage; it expects 24VAC already present in your enclosure or distribution. Verify upstream 24VAC infrastructure before specifying this unit into a new design.
Deployment Considerations:
- The 1A per-channel maximum is the binding constraint—aggregate draw across both outputs cannot exceed 2A. Verify every connected device (strike, reader, sensor) fits within this budget before commissioning.
- PTC outputs auto-reset after a fault clears, but repeated tripping indicates a wiring problem or overload condition. Don't ignore repeat trips as 'normal operation'—investigate the cause.
- Requires 24VAC input already provisioned in your cabinet or control enclosure. If deploying into a 110-240VAC-only environment, add a separate 24VAC transformer upstream.
Position the AL125ULP in access control retrofit projects, auxiliary 24VDC backup circuits for small cameras or readers, and OEM integration where compact dual-voltage flexibility justifies the small per-channel current budget. Skip it if you need aggregate power above 2A or if your environment runs only 110-240VAC mains without 24VAC infrastructure already in place.
