Altronix T2428175220 Dual-Voltage AC Power Supply Transformer
Overview
The Altronix T2428175220 is a hardwired AC power supply transformer designed for international and industrial security installations running on 230–240VAC, 50/60 Hz mains. It delivers selectable output at either 24VAC (7.5A, 175VA) or 28VAC (6.25A, 185VA), making it a practical single-SKU solution for facilities that mix PTZ cameras, access control panels, and video intercoms on the same power run. If you're sourcing a power supply for a European or international site, or a domestic facility with 220V service, the T2428175220 covers both use cases without requiring an additional step-down transformer.
Altronix has built its reputation around Altronix power distribution and access control power products engineered for security integrators, and the T2428175220 follows that same design philosophy — straightforward wiring, a wide operating temperature window, and output ratings that match real-world PTZ and access control loads.
Key Features
- Selectable 24VAC or 28VAC Output: Many PTZ cameras and pan/tilt mechanisms specify 24VAC; a growing number of access control lock hardware kits call for 28VAC. Having both options in one unit means you're not stocking two separate transformers on the truck. Select the tap that matches your load — 7.5A at 24VAC or 6.25A at 28VAC.
- 175–185VA Output Power: At 175VA (24VAC tap) or 185VA (28VAC tap), this transformer can comfortably support multiple camera pan/tilt heads or a combination of access control strikes and readers on a single power run. Size your load to stay under 80% of nameplate — 140VA continuous is a reliable working ceiling.
- 230–240VAC, 50/60 Hz Input: Wired directly to European and international mains without any adapter or line conditioner. The 50/60 Hz dual-frequency tolerance means it installs cleanly in both EU and select international markets where frequency can vary. Drawing only 0.8A from the mains, it won't trip breakers on shared circuits.
- -40°C to 60°C Operating Range: The full -40°C cold-start rating means this unit survives unheated utility rooms, outdoor enclosures in northern climates, and industrial environments without supplemental heating. The 60°C upper limit provides margin in warm server rooms or enclosures with modest airflow.
- 90 BTU/Hr Heat Output: At 90 BTU/Hr, thermal management planning is straightforward. In a sealed enclosure, account for roughly 26W of continuous heat — manageable with standard louvered enclosure venting and important to calculate if the unit shares a cabinet with other heat-generating equipment.
- 85% RH Humidity Tolerance: Rated to 85% relative humidity (±5%), the T2428175220 handles the condensation-prone environments common in loading docks, stairwells, and parking structure utility rooms without derate or additional protection.
- Compact Form Factor at 7.3 lb.: At 7.3 lb. (3.31 kg), this is a unit you can mount inside a standard access control enclosure or attach to a backplate without engineering a dedicated cabinet. Shipping weight of 8.05 lb. confirms a minimal packaging footprint for site delivery.
Integration and Compatibility
The T2428175220 is intended for integration with access control systems, PTZ camera pan/tilt heads, video intercoms, and other security devices that require class-2 AC power at 24VAC or 28VAC. It is not a DC supply and is not suitable for PoE infrastructure — pair it with a dedicated PoE switch for IP camera runs. When deploying alongside access control hardware, verify your lock and reader aggregate draw against the 7.5A (24VAC) or 6.25A (28VAC) output ceiling. For multi-door deployments where total power demand exceeds this rating, Altronix offers higher-capacity units in the same transformer family. Consult the relevant surveillance and access control planning guide to map power zones before specifying transformer count per floor or zone.
The storage temperature range of -20°C to 70°C is relevant if the unit will be warehoused in an unheated facility before installation — no special climate-controlled storage is required.
Frequently Asked Questions
Q: What input voltage does the T2428175220 require?
A: The T2428175220 is designed for 230–240VAC input at 50 or 60 Hz, drawing 0.8A from the mains. It is not suitable for 120VAC North American residential service without a step-up transformer — it is intended for international and industrial 220V circuits.
Q: Can I use the T2428175220 for both 24VAC and 28VAC devices at the same time?
A: No. The output is selectable — either 24VAC at 7.5A or 28VAC at 6.25A — not simultaneous. Select the tap that matches your device requirements before wiring. Mixing voltages on a single tap is not supported.
Q: What is the continuous load limit I should plan for?
A: Industry best practice for transformer sizing is 80% of nameplate. At 24VAC, that's approximately 140VA continuous; at 28VAC, approximately 148VA. Avoid running at full 175VA or 185VA nameplate for extended periods to preserve transformer life and reduce thermal output.
Q: Is the T2428175220 rated for outdoor or unheated enclosure use?
A: The operating temperature range is -40°C to 60°C, which covers most unheated indoor utility rooms and enclosures in cold climates. If the unit will be installed in a true outdoor enclosure exposed to weather, ensure the enclosure itself provides the appropriate IP/NEMA environmental protection — the transformer's temperature range is not a substitute for enclosure weatherproofing.
Q: How much heat does the T2428175220 generate in an enclosure?
A: The rated heat output is 90 BTU/Hr (approximately 26W continuous). When mounting inside a shared cabinet, add this figure to the heat load of all other equipment to determine whether passive venting or active cooling is required.
Q: What is the shipping weight and does it ship with mounting hardware?
A: The product weighs 7.3 lb. (3.31 kg) and ships at 8.05 lb. (3.65 kg). Package contents beyond the transformer unit are not confirmed in available evidence — contact the seller prior to ordering if specific mounting hardware is required for your enclosure.
The T2428175220 is the unit I specify when a project calls for 220V-input AC power in an access control or PTZ deployment — specifically because the selectable 24VAC/28VAC tap means I can match the exact voltage spec on the lock hardware or pan/tilt head without sourcing a second transformer. At 7.5A on the 24VAC tap and 6.25A on the 28VAC tap, the output headroom is real, not marginal.
Technical Highlights:
- 0.8A Mains Draw: At 230–240VAC input, this transformer pulls under 1A from the circuit — clean enough to share a breaker with other low-draw equipment in an IDF or utility room without needing a dedicated 15A circuit for power alone.
- -40°C Cold-Start Rating: Most transformers derate or specify a 0°C operating floor. The -40°C rating on this unit means it commissions cleanly in unheated parking structures and northern-climate utility rooms where temperature at pull-in can be extreme.
- 90 BTU/Hr Thermal Load: This is a number most integrators skip until they get a callback about a tripped thermal cutout. At 90 BTU/Hr, you need to account for roughly 26W of heat in any shared enclosure — plan louvered venting accordingly, especially in summer in southern regions.
Deployment Considerations:
- This is a 220V-input unit — confirm site power before ordering. If the building runs 120VAC North American standard service, this transformer will not function without a step-up converter, which adds cost and a single point of failure.
- The 80% continuous load rule is not optional on transformers of this class. Budget no more than 140VA at the 24VAC tap for long-run reliability — running at nameplate indefinitely shortens service life and raises enclosure temperature toward the 60°C operating ceiling.
The T2428175220 is the right call for international site deployments — EU-standard facilities, multi-tenant commercial buildings running 230V infrastructure, or domestic industrial sites with dedicated 220V service — where you need reliable dual-voltage AC output in a single compact unit without building a custom power rail.
