The control transformer module decreases the line voltage from the power source down to a voltage of 24 V, which is required by several modules of the training system. The connections to the primary winding of the control transformer are made through 4 mm test leads (high voltage), and the connections to the secondary winding are made through 2 mm test leads (low voltage). Fuses protect the primary and secondary winding. This module is also equipped with four fault switches and two ground terminals.