Abstract: A module for use in a training system assembly which includes a power base is multi-sided and includes mechanical-electrical feet on one side for jacking the module into the power base or into a second module. Detent spring latches are disposed on another side of the module for receiving the feet of a second module atop the first module. The module is hollow and an electrical component is mounted therein. The component is an electrical connection with the feet and the detent spring latches. A display is on a third side of the module and the rear of the module includes a fault selector switch which causes the component to be in either an operating configuration or a fault configuration.