Systems for protecting dynamoelectric machines from
over-temperature conditions comprising one or more ther
mal sensors, such as positive temperature coe?icient (PTC)
of resistivity sensors, disposed in heat transfer relationship
with the windings of the motor are well known in the prior
art. It is also well known to add other protective functions to
such systems which will protect various apparatus from the
occurrence of additional conditions in an economical and
e?icient manner.