24V 1.25A AC-AC Power Supply - 2.1mm x 5.5mm Linear Wall Plug | AC-2412A
The AC-2412A is a linear wall-mount transformer that plugs into a standard US outlet and delivers 24V AC at 1250mA (1.25A) through a 2.1mm x 5.5mm female barrel connector. The extra current headroom over a typical 1-Amp supply makes it a practical replacement where a 24VAC device draws more than a basic adapter can hold.
Important: This is an AC-AC adapter. It outputs alternating current (~), not DC (⎓). Check the label on your device and confirm it calls for 24V AC before ordering.
Technical Specifications
- Model: AC-2412A
- Input: 120V AC, 60Hz (standard US wall outlet)
- Output: 24V AC @ 1250mA (1.25A)
- Output type: Alternating current (AC-AC), no polarity
- Connector: 2.1mm (ID) x 5.5mm (OD) female barrel plug
- Design: Linear wall-mount transformer
- Brand: PHC Enterprise, Inc.
- Weight: 1.58 lb
Common Use Cases
- Irrigation and sprinkler timers: replacement power for 24VAC controllers that use a barrel-plug transformer.
- HVAC controls: supply power for 24VAC zone valves, dampers and relays rated at or below 1.25A.
- Security and access control: 24VAC input cameras, camera heaters and blowers, and magnetic door locks within the current rating.
- Industrial and bench use: control power for 24VAC relays, solenoids and test fixtures.
Compatibility Notes
This adapter suits equipment that lists a 24V AC input and accepts a 2.1mm x 5.5mm barrel jack, such as many Rain Bird, Hunter and Orbit irrigation controllers. Because barrel sizes and input types vary by model year, check three things on your device label before ordering: that it says AC (not DC), that it lists 24V, and that its current draw is 1.25A or less. Smart thermostats such as Nest and Ecobee are usually powered from the HVAC system transformer rather than a barrel plug, so confirm your setup uses a plug-in 24VAC supply first.
Frequently Asked Questions
Can I use this on a device that needs 24V DC?
No. This unit outputs alternating current. A 24VDC device requires a DC supply, and connecting an AC supply can damage it.
Does polarity matter?
No. AC output has no center-positive or center-negative polarity, so the barrel orientation does not need to match a DC polarity marking.
My device only draws 500mA. Is 1.25A too much?
No. The device draws only the current it needs. The 1.25A figure is the maximum the transformer can supply.
Will it work on 220-240V outlets?
No. It is built for 120V AC, 60Hz North American outlets.
What connector size is this?
A 2.1mm inner diameter by 5.5mm outer diameter female barrel plug.
