9V AC-AC Power Adapter, 3330mA (3.33A) Wall Transformer, 2.1mm x 5.5mm Plug, AC9V Linear Power Supply | AC-93A
AC-93A is a high-current wall-mount linear AC-to-AC power adapter delivering 9V AC output at 3330mA (3.33A) (~30VA). Features a standard 2.1mm x 5.5mm straight barrel plug. Designed for applications requiring low-voltage alternating current without internal regulation.
⚠️ Voltage & Output Notice: This is an AC-to-AC transformer (outputs AC voltage ~), not a DC power adapter. Before ordering, verify that your device explicitly specifies 9VAC or displays the ~ symbol. Unloaded voltage may measure higher than 9V on a multimeter; this is normal operation for non-regulated linear transformers.
Technical Specifications
- Model: AC-93A
- Input Voltage: 120V AC, 60Hz
- Output Voltage: 9V AC (Alternating Current)
- Maximum Output Current: 3330mA (3.33A)
- Apparent Power: ~30VA
- Connector Plug: 2.1mm (Inner Diameter) × 5.5mm (Outer Diameter) straight barrel
- Adapter Type: Wall-mount linear transformer (non-regulated)
- Legacy Cross Reference: AC-915A
Common Applications & Compatibility Guidelines
Suitable for low-voltage AC equipment requiring 9VAC up to 3.33A with a matching 2.1mm × 5.5mm jack. Common applications include select security keypads, access control boards, alarm system expanders, and low-voltage control circuits.
Verification Checklist: Confirm that your device requires 9VAC (not 9VDC), draws 3.33A (3330mA) or less, accepts a 2.1mm x 5.5mm plug, and has sufficient outlet clearance for a wall-mount transformer.
Frequently Asked Questions
How do I know if my device requires AC or DC?
Check the power label near the input jack on your device. AC requirement is indicated by VAC, AC, or the alternating current symbol (~). If your label specifies VDC or shows a solid line over a dashed line, you require a DC power adapter, not this unit.
Why does my multimeter read higher than 9V when tested?
This is an unregulated linear transformer. Without a load connected, the open-circuit output voltage will naturally measure higher (typically 10V–11.5VAC). The voltage will stabilize to 9VAC once connected to an active load operating within its current rating.
Can I use this as a replacement for an AC-915A transformer?
Yes, the AC-93A serves as a direct high-current replacement for 9VAC applications using a 2.1mm x 5.5mm plug previously referencing part number AC-915A, provided the voltage and plug size match your equipment.
