12V AC-AC power adapter by PHC Enterprise, Inc., with 3000mA current and 2.1mm x 5.5mm straight plug connector.

2.1 x 5.5mm DC plug dimensions for PHC Enterprise 9V AC-DC switching power supply, center-positive polarity

12V AC-AC Power Adapter 3000mA (3A) | 2.1mm x 5.5mm Straight Plug | AC-123A

Name: 12V AC-AC Power Adapter 3000mA (3A) | 2.1mm x 5.5mm Straight Plug | AC-123A
Rating: 5.00 (4 reviews)

by PHC Enterprise, Inc.

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12V AC-AC Linear Wall Transformer — 3000mA (3A)

Part AC-123A

The AC-123A is a wall-mount linear AC-to-AC power adapter delivering 12V AC output at 3000mA (3A). It includes a 2.1mm x 5.5mm straight barrel plug. Use this adapter only when your device specifically requires 12VAC alternating current (~) and the connector dimensions match.

⚠️ Critical Note: This is an AC-AC adapter. It outputs alternating current, not DC. A device labeled 12VDC is not compatible. Verify the device label for the ~ symbol or VAC before purchasing.

Technical Specifications

Model: AC-123A
Input: 120V AC, 60Hz
Output: 12V AC at 3000mA (3A)
Connector: 2.1mm (ID) x 5.5mm (OD) straight barrel plug
Type: Wall-mount linear transformer (non-regulated)

Common Use Cases & Compatible Devices

Audio Equipment: Professional audio mixers, recording gear, and certain guitar multi-effects processors requiring 12VAC
Security Systems: Surveillance cameras, CCTV housings, and security control panels specifying 12VAC
Commercial Displays & Specialty Electronics: Neon sign controllers, decorative lighting systems, and pinball or arcade components requiring 12VAC

Known Applications & Compatibility

Holiday & Specialty Lighting: Compatible replacement for many 12VAC fiber optic Christmas tree bases, class 2 fiber optic illuminators, and decorative displays.
Audio & Security: Ideal for 12V AC audio mixers, preamps, CCTV control panels, and door access systems requiring up to 36VA output.

Common Replacement Compatibility

Use as a replacement only when the original adapter or device label specifies 12VAC, a compatible 2.1mm x 5.5mm connector, and current requirements of no more than 3000mA (3A). This output is equivalent to a maximum 36VA rating. Confirm the connector fit and AC output requirement before connecting.

Frequently Asked Questions

Q: How do I know if my device needs AC or DC?
A: AC is shown by the ~ symbol or the letters VAC. DC is shown by VDC or the DC symbol. This adapter is not for DC-only devices.

Q: Why can a voltmeter show more than 12V?
A: This is a non-regulated linear transformer. Its no-load voltage can measure higher than the rated output until a device is connected.

Q: Does the connector have polarity?
A: AC output does not use positive or negative DC polarity, but the connector dimensions and device voltage requirement must still match.

Q: What should I verify before ordering?
A: Confirm that your device requires 12VAC, accepts up to 3A, and uses a 2.1mm x 5.5mm barrel connection.

5 stars: 4 (100%)
4 stars: 0 (0%)
3 stars: 0 (0%)
2 stars: 0 (0%)
1 star: 0 (0%)

Good replacement ac adapter

Good price for a quality unit.

Fast shipping and reasonable pricing

The title says it all. Very happy with the power supply for my LED Christmas tree.

Thank you for your positive feedback! We're glad to hear that you are satisfied with the fast shipping and reasonable pricing of our AC-AC power supply. Happy to know that it's working well for your LED Christmas tree. Happy holidays!

Perfect experience

Everything I needed I got with this! Everything worked great and has been working without a hitch. Highly recommend

Thank you for taking the time to leave a review! We are thrilled to hear that our AC-AC power supply met all your needs and has been working perfectly for you. We appreciate your recommendation and thank you for choosing our product. We are always here to help if you have any further questions or concerns. Happy powering!

AC-AC Power Supply 12V AC @ 3000mA; 2.1 x 5.5mm

Thank you for your review of our AC-AC Power Supply. We are glad to hear that it met your expectations and provided the necessary 12V AC @ 3000mA with a 2.1 x 5.5mm connection. We appreciate your feedback and hope to continue providing quality products for your needs. Thank you for choosing our brand.

5 stars: 4 (100%)
4 stars: 0 (0%)
3 stars: 0 (0%)
2 stars: 0 (0%)
1 star: 0 (0%)