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

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.