TB400 – Test Box for 400HZ A.C. Ground Power Output Cables

tb400 Test BoxThe TB400 test box is designed to test power cables for proper connection and phasing. It is equipped with a standard aircraft receptacle and a 28V interlock circuit to simulate connection to an aircraft.


  • Plug test pins for connecting test leads
  • 28V TR to provide voltage for interlock circuit
  • Standard 400Hz A.C. aircraft receptacle
  • Power indicator lights
  • Phase rotation indicator
  • E and F circuit indicator
  • Line and neutral reversed indicator
  • Folding handle


  • Length: 8″
  • Width: 6″
  • Height: 6″
  • weight: 8 Lbs.