9V AC-AC Power Adapter, 3330mA (3.33A) Wall Transformer, 2.1mm x 5.5mm Plug, AC9V Linear Power Supply | AC-93A

9V AC-AC Linear Wall Transformer — 3330mA (3.33A)

Part AC-93A

The AC-93A is a high-current wall-mount linear AC-to-AC power adapter delivering 9V AC output at 3330mA (3.33A). It includes a 2.1mm x 5.5mm straight barrel plug. Use this transformer only when your device specifically requires 9VAC alternating current (~), needs no more than 3.33A, and the connector dimensions match.

⚠️ Important: This is a non-regulated AC-AC adapter that outputs 9VAC, not DC. Before ordering, confirm your device label shows 9VAC or the ~ symbol and that it uses a 2.1mm x 5.5mm connector. The output may measure higher than 9V with no load, which is normal for this type of transformer.

Technical Specifications

• Model: AC-93A
• Input: 120V AC, 60Hz
• Output: 9V AC at 3330mA (3.33A), approximately 30VA
• Connector: 2.1mm (ID) x 5.5mm (OD) straight barrel plug
• Type: Wall-mount linear transformer (non-regulated)
• Older Part Reference: AC-915A

Common Use Cases & Compatible Devices

• Alarm and Security Panels: Some multi-zone DSC, Honeywell (Resideo), and Bosch systems that specifically require high-current 9VAC. Verify the exact model before ordering.
• Access Control Systems: Electric strikes, magnetic locks, and access control boards that specify 9VAC and use a compatible 2.1mm x 5.5mm connector.
• Security Keypads and Peripherals: Expanded alarm systems with multiple keypads, zone expanders, or wireless receivers requiring additional 9VAC capacity.
• Low-Voltage Control Equipment: Commercial or industrial control panels requiring 9VAC at higher current.

Common Replacement Compatibility

The AC-93A is identified as a high-current replacement for 9V AC transformers using a 2.1mm x 5.5mm straight barrel plug, including older applications associated with part reference AC-915A. Confirm your original adapter's AC output, connector dimensions, and current 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 9V?
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: What current rating should my device have?
A: Confirm that the device requires 9VAC and draws no more than 3330mA (3.33A). The connector dimensions must also match.

Q: What should I verify before ordering?
A: Confirm 9VAC output, 120V AC input compatibility, a 2.1mm x 5.5mm straight barrel connection, and enough clearance for a wall-mount transformer.