12V AC-AC Power Adapter, 1000mA (1A) Wall Transformer, 2.5mm x 5.5mm Plug, AC12V Linear Power Supply | AC-121B
Part AC-121B
Input: 120V AC, 60Hz (Standard US Wall Outlet)
Output: 12V AC @ 1000mA (1 Amp, 12VA)
Connector: 2.5mm (ID) x 5.5mm (OD) Straight Barrel Plug
Type: Linear Wall-Mount Transformer
Replaces: AC-1285B
Common Applications
This 12VAC transformer with a 2.5mm barrel connector is a direct replacement for equipment that specifically requires the less-common 2.5mm plug — do not confuse with the more common 2.1mm connector. It is commonly used for:
- Alarm & Security Panels: Powering DSC, Napco, and similar alarm control panels that require 12VAC input via a 2.5mm barrel connector.
- Intercom Systems: Replacement power supply for residential and light commercial intercom units requiring 12VAC.
- Access Control Boards: Low-draw access control panels and keypads requiring 12VAC at 1A or less.
- Low-Voltage Control Equipment: Replacement for OEM 12VAC transformers on commercial and industrial control boards with 2.5mm barrel inputs.
Common Compatibility
Direct replacement for 12V AC adapters using a 2.5mm x 5.5mm barrel plug. Replaces older part AC-1285B.
Important Note: This is an AC-AC adapter. It outputs alternating current (~). Please verify your device does not require DC (⎓) before purchasing. Also verify your device uses a 2.5mm inner diameter plug — not the more common 2.1mm.
