Altronix T2428300220 300VA 24/28VAC Surveillance Power Transformer
Overview
The Altronix T2428300220 is a 300VA step-down power transformer designed for commercial security and access control installations that operate on 220VAC mains — common in international deployments, industrial facilities, and multi-tenant buildings wired to European or Latin American electrical standards. It delivers selectable 24VAC or 28VAC output at up to 14A and 12.5A respectively, providing a stable, clean power source for access control panels, electric locks, gate operators, and surveillance equipment that demand AC power rather than DC conversion.
For integrators sourcing from the Altronix power solutions catalog, the T2428300220 fills a specific gap: 220VAC-input infrastructure where standard North American 120VAC transformers simply cannot be used. This is not a universal substitution — it is a purpose-built unit for the right electrical environment.
Key Features
- 300VA Output Capacity: At 300VA, this transformer can simultaneously power multiple access control panels, electric strikes, and magnetic locks on a single feed — reducing the number of dedicated power supplies needed in a control room or head-end enclosure. That directly cuts conduit runs and installation labor on larger door counts.
- Selectable 24VAC or 28VAC Output: Dual output voltage selection lets you match the transformer to the specific load requirement of your downstream devices. Most Altronix access control power supplies and many third-party panels accept 24VAC; the 28VAC tap accommodates equipment with slightly higher input minimums or longer wire runs where voltage drop is a factor.
- 14A @ 24VAC / 12.5A @ 28VAC: Generous current headroom means you are not engineering at the rail — leaving capacity for inrush from solenoid locks and door operators without nuisance trips or transformer saturation. Budget your steady-state load to no more than 80% of rated output for reliable long-term operation.
- 220VAC, 50/60 Hz Input: Accepts both 50 Hz and 60 Hz mains, making this unit viable across North American 220V services (two-pole 110V legs), European 230V-class infrastructure (within transformer tolerance), and international job sites without requiring a separate frequency converter.
- 1.4A Input Draw: Low input current demand means this transformer can be fed from a standard 15A or 20A branch circuit with substantial margin remaining for other panel loads — useful when electrical panel space is constrained.
- Operating Range 0°C to 49°C: Rated for the full thermal envelope of enclosed equipment rooms and electrical closets, including spaces without dedicated HVAC that can warm significantly in summer. The 154 BTU/Hr heat dissipation figure is relevant for thermal planning in tightly packed enclosures — account for it when sizing ventilation.
- Compact Form Factor — 5" x 5" x 3.35" / 6.95 lb: Fits inside standard Altronix enclosures and most third-party metallic backboxes without requiring a dedicated rack position. The sub-7 lb weight keeps panel mounting straightforward for a single installer.
Integration & Compatibility
The T2428300220 is intended as a primary AC power source feeding access control and surveillance power supplies that require 24VAC or 28VAC transformer input — not as a standalone end-device power supply. Pair it with Altronix multi-output power distribution boards, linear power supplies, or direct-wire lock controllers. Verify your downstream device's input voltage tolerance and VA requirements before selecting the 24VAC or 28VAC tap. For 120VAC-input installations, this unit is not the correct choice — consult a standard North American transformer in the same Altronix family. Review your access control power planning requirements to confirm load budgets before specifying.
Frequently Asked Questions
Q: What is the output voltage of the T2428300220, and can I switch between 24VAC and 28VAC in the field?
A: The T2428300220 provides selectable 24VAC or 28VAC output. The tap selection is made at installation — confirm your downstream equipment's input voltage requirement before wiring.
Q: Is the T2428300220 compatible with 50 Hz and 60 Hz mains?
A: Yes. The transformer accepts 220VAC at both 50 Hz and 60 Hz, making it suitable for international installations and facilities with European-standard electrical infrastructure.
Q: How much current can the T2428300220 supply?
A: It delivers up to 14A at the 24VAC tap or 12.5A at the 28VAC tap, for a total rated output of 300VA.
Q: What is the heat output, and do I need to ventilate the enclosure?
A: The transformer dissipates 154 BTU/Hr under load. In enclosed or poorly ventilated spaces, account for this heat output when sizing enclosure ventilation to keep operating temperatures within the 0°C to 49°C rated range.
Q: Can this transformer be used with standard North American 120VAC circuits?
A: No. The T2428300220 requires 220VAC input. It is not compatible with standard single-pole 120VAC North American circuits. Use it only where 220VAC mains are available.
The T2428300220 comes up specifically on international and industrial projects where the electrical infrastructure runs 220VAC — and where reaching for a standard North American transformer would be a wiring mistake from day one. The 300VA rating at up to 14A on the 24VAC tap gives you real headroom for multi-door access control deployments without stacking multiple smaller units.
Technical Highlights:
- 300VA / 14A @ 24VAC: Enough capacity to feed several Altronix multi-output power distribution boards simultaneously — reduces the total transformer count in a head-end rack and simplifies the AC distribution design.
- 50/60 Hz Input Acceptance: One unit works across both North American 220V two-pole services and international 50 Hz mains, so you are not spec'ing a different part number for each region on multi-site projects.
- 154 BTU/Hr Dissipation: In a sealed metallic enclosure, that thermal load matters. Factor it into your enclosure sizing — a standard vented Altronix enclosure in a 35°C equipment room will stay within the 49°C operating limit, but a sealed box in a hot utility room may not.
Deployment Considerations:
- Always confirm the downstream device's input voltage tolerance before selecting the 24VAC vs 28VAC tap — mismatching can damage equipment rated only for 24VAC nominal.
- Load budget to 80% of rated capacity (roughly 240VA continuous) to avoid thermal saturation over long operating cycles — particularly relevant in warm electrical closets near the 49°C ceiling.
This transformer is the right call for multi-door commercial access control deployments in Latin American facilities, European branch offices, or any industrial site running 220VAC infrastructure — where sourcing a purpose-built unit like this avoids field-built voltage conversion workarounds.
