Altronix T2SSK2DQ Dual-Output 24V/12V 10A Power Distribution Unit
Overview
The Altronix T2SSK2DQ is a commercial-grade, dual-voltage power distribution unit designed for mid-to-large security installations where multiple devices running on two different supply voltages must be powered from a single, managed enclosure. With two independent power supplies — one delivering 24VDC at 10A and a second delivering 12VDC at 10A — this unit eliminates the need to deploy separate power infrastructure for mixed-voltage device loads. Sixteen individually protected PTC (Positive Temperature Coefficient) outputs give installers granular per-device fault isolation: if one branch draws excess current, that output self-resets rather than dropping the entire rail or blowing a conventional fuse that needs manual replacement. The T2SSK2DQ ships with an S2-class enclosure, drawing from 120VAC/60Hz at up to 4.5A input, and supports a 12VDC/12AH battery for standby backup — a requirement in most UL-listed access control and intrusion panel deployments.
The unit carries CE European Conformity, making it suitable for installations that also serve European sites or equipment under CE-mandated compliance frameworks. Enclosure dimensions of 27.25" x 21.5" x 6.5" place this firmly in the large-format wall-mount category — plan your wall real estate accordingly, especially in tight IDFs or utility closets.
Key Features
- Dual Voltage Outputs — 24VDC @ 10A and 12VDC @ 10A: Running readers, door controllers, and video intercoms that span both 12V and 24V requirements from one unit cuts conduit runs and simplifies troubleshooting. You're not hunting across two separate power supplies when a device misbehaves — everything is in one labeled enclosure.
- 16 PTC-Protected Distribution Outputs: PTC outputs self-reset after an overcurrent event, avoiding the late-night service call to swap a blown fuse. With 16 discrete outputs across the two rails, large multi-reader or multi-camera deployments get device-level isolation without additional distribution boards.
- 12VDC / 12AH Battery Backup Support: Built-in battery charging circuitry keeps a 12AH standby battery conditioned and ready. During a mains outage, critical devices stay online — essential for access control panels where door-fail-secure or fail-safe behavior is life-safety relevant.
- 120VAC / 60Hz Input, 4.5A Max Draw: A single standard 20A branch circuit easily handles the full input load. No dedicated high-amperage circuit is required, simplifying the electrical coordination on new construction or retrofit jobs.
- Operational Temperature Range 0°C to 49°C: The T2SSK2DQ is rated for environments up to 49°C — adequate for most climate-controlled equipment rooms and enclosed utility areas. This is not a rated outdoor or extreme-environment unit; plan for conditioned space.
- Storage Temperature to 70°C / Humidity to 85% RH: Wide storage envelope means the unit can be staged in warehouse or pre-deployment environments without conditioning concerns before installation.
- CE European Conformity: CE listing broadens deployment scope to include EU-regulated site environments and equipment packages requiring CE-marked power infrastructure components.
- Large S2-Class Enclosure (27.25" x 21.5" x 6.5"): The generous enclosure interior provides physical room for wiring management across 16 output runs — a real factor on complex installs where cable dressing inside the box often gets overlooked until the door won't close.
Integration and Compatibility
The T2SSK2DQ fits naturally into Altronix's power and access control ecosystem, which is built around complementary controllers, relay boards, and expansion modules designed to pair with this enclosure class. The dual-voltage architecture directly supports mixed-device systems: 24VDC outputs commonly serve door strikes, magnetic locks, and certain PTZ cameras; 12VDC outputs serve card readers, motion detectors, glass-break sensors, and many IP camera platforms. Integrators building out a commercial access control or surveillance power distribution infrastructure should verify per-device current draw against each rail's 10A capacity before committing final device counts.
This is not a PoE power source — it delivers low-voltage DC, not data-carrying PoE. Devices that require PoE (cameras, VoIP endpoints) still need a dedicated PoE switch in the topology. The T2SSK2DQ handles non-PoE security device power: readers, locks, panels, sensors. If your bill of materials is predominantly PoE cameras with minimal low-voltage lock hardware, a different distribution architecture will serve better.
Battery connection supports a standard 12VDC/12AH sealed lead-acid battery — a common form factor that is field-replaceable without special tools. Confirm battery enclosure clearance given the 27.25" x 21.5" x 6.5" box dimensions when batteries are installed alongside the main unit.
Frequently Asked Questions
Q: Can the T2SSK2DQ power both 24V and 12V devices simultaneously from the same unit?
A: Yes. The T2SSK2DQ has two independent power supplies — one 24VDC at 10A and one 12VDC at 10A — operating simultaneously. You can run 24V devices (such as door strikes or certain intercoms) on one rail and 12V devices (readers, sensors) on the other from the same enclosure.
Q: What type of battery does the T2SSK2DQ support for backup power?
A: The unit supports a 12VDC / 12AH battery. It includes internal charging circuitry to maintain the battery. A standard 12AH sealed lead-acid battery is the typical fit — verify physical dimensions against available enclosure clearance.
Q: What happens if one PTC output is overloaded — does it shut down the entire rail?
A: No. PTC (Positive Temperature Coefficient) outputs are self-resetting and individually fused. An overcurrent on one output increases that output's resistance and limits current to that branch only, without affecting other outputs or the main rail. Once the fault clears, the output self-resets — no manual fuse replacement required.
Q: What input power does the T2SSK2DQ require?
A: The unit runs on 120VAC, 60Hz with a maximum input draw of 4.5A. A standard 20A branch circuit provides ample headroom. No dedicated high-amperage circuit is required.
Q: Is the T2SSK2DQ suitable for outdoor or uncontrolled environments?
A: No. The T2SSK2DQ is rated for 0°C to 49°C operating temperature. It is designed for climate-controlled indoor environments — equipment rooms, utility closets, or conditioned spaces. Do not deploy in unheated or outdoor enclosures without supplemental environmental controls.
Q: Does the T2SSK2DQ carry any regulatory certifications?
A: The T2SSK2DQ carries CE European Conformity certification. Verify with your AHJ (Authority Having Jurisdiction) for any site-specific listing requirements beyond CE.
The T2SSK2DQ is the unit I recommend when an integrator has a bill of materials that mixes 24V locking hardware with 12V readers and sensors and doesn't want to commission two separate power cabinets. The dual 10A rails give you 20A of total capacity distributed across 16 self-resetting PTC outputs — that's a meaningful safety margin on a mid-size installation before you start worrying about current budget.
Technical Highlights:
- Dual 10A Rails: 24VDC and 12VDC each at 10A provides 240W of aggregate capacity. Most access-control door deployments draw 1–3A per door position, so a single T2SSK2DQ can realistically serve a 4–8 door system with device headroom depending on lock and reader specifications.
- 16 PTC Self-Resetting Outputs: Eliminates the fuse-replacement service call. A shorted reader or a miswired strike trips its individual output — the rest of the system stays up, and the output resets when the fault is cleared. This matters on live sites where downtime on other doors isn't acceptable.
- 12AH Battery Backup Integration: The onboard charger maintains the standby battery continuously. A 12AH battery at moderate load typically delivers 2–4 hours of runtime — enough to cover most brief outages and bridge until generator transfer.
Deployment Considerations:
- At 58.3 lbs and 27.25" x 21.5" x 6.5", this enclosure needs two people and pre-planned wall anchoring. Map your wall blocking and conduit entry points before the unit arrives on site — retrofitting anchor points after the fact in a finished equipment room is slow work.
- The 49°C (121°F) operating ceiling is the hard limit. Equipment rooms in buildings without adequate HVAC — telecom closets in older construction, rooftop enclosures — can exceed this during summer peaks. Verify ambient temperature before install; derate your load expectations if ambient regularly approaches 40°C.
For a healthcare or municipal facility with a mixed-voltage access control refresh — card readers, electromagnetic locks, and door position sensors across a single floor — the T2SSK2DQ gives a single managed power point with device-level fault isolation and code-relevant battery backup in one enclosure. That's the use case where this unit earns its footprint.
