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Charging cable for 140–240 W laptops

Get this

A 240 W USB-C cable (EPR, 48 V / 5 A)

Look for

  • "240W" on the cable or box (USB-IF 240W logo)
  • A USB PD 3.1 EPR charger

Avoid

  • 100 W and Thunderbolt 4 cables: capped at 100 W

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The power arithmetic

Volts × ampsWattsCable needed
20 V × 5 A100 W5 A e-marked cable
28 V × 5 A140 W240 W EPR cable
36 V × 5 A180 W240 W EPR cable
48 V × 5 A240 W240 W EPR cable

Standards behind this answer

2012

USB Power Delivery (60 W, 100 W, 240 W)

The charger and device agree a voltage; the cable decides whether 3 A or 5 A is safe.

  • power: 60 W / 100 W / 240 W