Lenovo 4X21U28818 power adapter/inverter Indoor 140 W Black

The ThinkPad Mobile Workstation 140W USB-C GaN Slim AC Adapter (Lenovo 4X21U28818) is a compact, GaN-based replacement or spare power adapter for laptops and workstations with a USB-C power input. It delivers up to 140 W of output power, accepts 115–230 V input at 50/60 Hz, and is intended for indoor use. The unit includes a 1.0 m power cord, comes in black, and is compatible with Lenovo workstations that use a USB-C power plug.

Advantages

GaN technology reduces size and weight compared with traditional silicon adapters, offering a smaller profile while maintaining high power delivery. With 140 W output the adapter supports fast charging for compatible laptops and workstations. The adapter is UL/CB/CE certified for safety and reliability and includes a standard 1.0 m cable for typical indoor setups.

Suitable for

• Lenovo ThinkPad and mobile workstation models with USB-C power input
• Laptops requiring up to 140 W USB-C PD charging
• Replacement or spare adapter for office or home use

Key specifications

• Model: Lenovo 4X21U28818
• Output power: 140 W
• Output voltage: 28 V
• Input voltage: 115–230 V
• Input frequency: 50/60 Hz
• Power cord length: 1.0 m
• Colour: Black
• Intended use: Indoor (laptop/workstation)
• Certifications: UL, CB, CE (manufacturer stated)
• Quantity: 1 pc
• Weight: 0.5 kg

How to use

Connect the adapter to an appropriate AC mains outlet using the supplied line cord. Plug the USB-C output into the compatible laptop or workstation USB-C power port. Ensure the device supports USB-C PD charging at the adapter’s power level; the connected device will negotiate appropriate power delivery automatically. Disconnect from mains before storing or cleaning.

Recommendations

Use the adapter indoors and avoid exposure to moisture or extreme temperatures. Check device compatibility with a 140 W USB-C power source and follow the laptop manufacturer’s guidelines for charging to ensure safe operation.