16494A is suitable for low current applications down to the sub fA level. It supports a maximum voltage/current of 200 V / 1A DC.
The Keysight 16493U High Current Coaxial cable is suitable for high current applications and supports up to 40 V and 20 A pulse. The 16493U is compatible with the B2901/10BL, B2901/02/11/12B, B2961/62B, and B2981/83/85/87B.