The Tri-Phase Control and Tri-Phase with Ground Trip Control (TPG) are comprised of solid-state circuit boards and “plug-in” type time current curve (TCC) cards. Controls include DIP-switches on the control circuit board and provide means to program control operation. Tri-Phase Control settings include unique minimum trip levels for each phase, activation and programming of the instantaneous trip feature, and selection between single and three-phase tripping.
TPG Control Settings include unique minimum trip levels for each phase and minimum trip levels for ground, a ground trip block ON/OFF switch, activation and programming of the instantaneous trip feature for both phase and ground, and selection between independent or threephase ganged tripping.
On both controls, independent trip operation is only possible when operating a VFI or PST-9 that is equipped with three individual single-phase trip handles.