The Faultable Transformers consists of three single-phase power transformers installed in a full-height EMS module. Each transformer has multiple primary and secondary windings. Fault taps are wired to switches or banana jacks on the front panel for insertion of winding-to-earth and winding-to-winding faults via current-limiting resistors. A current sensor is provided to observe the waveform of the primary current on transformer magnetizing inrush.