12V AC-AC Power Adapter 4170mA (4.17A) Screw Terminal | DSC Honeywell | AC-1241S3

Part: AC-1241S3
Input: 120V AC, 60Hz (Standard US Wall Outlet)
Output: 12V AC @ 4170mA (4.17 Amp, ~50VA)
Output Connector: 3-Position Screw Terminal Block
Type: Linear Wall-Mount Transformer
Replaces: AC-1245S

Common Applications

This high-current 12VAC transformer is designed for demanding hardwired installations that require significantly more power than standard 1A–2A supplies. The screw terminal output is suited for direct wire connections without barrel plugs. It is commonly used for:

• Large Multi-Zone Alarm & Security Panels: Powering high-draw DSC, Honeywell (Resideo), and Napco alarm systems with multiple keypads, zone expanders, wireless receivers, and sirens drawing combined high current.
• Commercial Gate & Barrier Operators: Supplying sustained high-current 12VAC to electric gate openers and barrier arm controllers with direct terminal block wiring.
• Multi-Door Access Control Systems: Powering commercial access control panels managing multiple electric strikes or magnetic locks simultaneously via hardwired connections.
• Commercial Low-Voltage Control Equipment: Replacement for high-VA 12VAC transformers in industrial and commercial control panels requiring screw terminal input at 4A or higher.

Common Compatibility

High-current hardwired replacement for 12V AC transformers with screw terminal connections used in large alarm systems, commercial gate operators, and multi-door access control installations. Replaces older part AC-1245S.

Important Note: This is an AC-AC adapter. It outputs alternating current (~). Please verify your device does not require DC (‐) before purchasing.

Frequently Asked Questions

Q: Can this replace a 12VAC 4A or 4.5A transformer?
A: Yes. As long as your system requires 12V AC and draws 4.17A (50VA) or less, this high-current power supply is fully compatible.

Q: Is this AC or DC output?
A: This outputs 12V AC (Alternating Current). Please verify your device requires AC power, as it will not work with 12V DC equipment.

Q: How are the 3 screw terminals wired?
A: The outer two terminals supply the 12V AC power output, while the center screw serves as an isolated equipment/earth ground terminal.