Power On with AC Attach

Many modern electronic devices—especially embedded systems, servers, and industrial computers—are designed to automatically power on when AC (alternating current) power is connected. This feature is commonly referred to as "Power On with AC Attach".

How It Works

When a device supports this function, its firmware (often configurable via BIOS/UEFI or hardware jumpers) monitors the presence of AC power. If power is restored after an outage—or if the device is plugged in while off—it will boot up without user intervention.

Common Use Cases

• Unattended servers that must restart after a power failure.
• Point-of-sale (POS) systems in retail environments.
• Digital signage and kiosks that need to resume operation automatically.
• Industrial automation equipment requiring minimal manual oversight.

Configuration Tips

To enable this behavior:

1. Enter your device’s BIOS/UEFI setup during boot (usually by pressing Del, F2, or Esc).
2. Look for settings like Restore on AC Power Loss, After Power Failure, or AC Power Recovery.
3. Select Power On or Always On instead of Stay Off.
4. Save changes and exit.

Considerations

While convenient, automatic power-on can pose safety or operational risks in some environments. Always verify that unintended startups won’t cause harm or data loss. Additionally, ensure proper surge protection and stable power delivery.