The invention relates to a circuit (1) for protecting against overload of
an electric motor (2), more particularly an electrically powered air
blower for a vehicle, with the purpose of providing sufficient and
appropriate protection even when several electric motors are connected in
series. Said circuit is provided with at least one switching element (6)
for controlling two series connected electric motors (2) independent of
revolutions, in which a switch element (14) configured as a make contact
element (12) is connected in parallel to the electric motor (2), said
switch element causing short circuiting of the corresponding electric
motor (2) in case of overheating.