The following failure modes can be considered.
(1) Case where the coil is disconnected due to an over current exceeding the specification range, and resulted in an open mode
(2) Case where the insulation between the coils could not be maintained due to an over current exceeding the specification range, and the inductance deteriorates
(3) Case where an over current continues to flow after item (2), and resulted in the open mode in item (1)