(57) The electrical appliance comprises
a chamber closed by a door (P),
a locking device (1) including an operating solenoid (26) connected in series with
a PTC resistor (38) between two electrical connecting terminals (12a, 27a), which,
as the result of a first energizing and at least one subsequent energizing of the
solenoid (26), is capable of assuming, respectively, a locking condition in which
it retains the door (P) in the position which closes the chamber, and an unlocking
condition in which it allows the door (P) to be opened; and
a control unit (40) connected to these electrical terminals (12a, 37a) and capable
of causing subsequent energizing of the said solenoid (26) by means of subsequent
applications of voltage between the said terminals (12a, 37a).
The control unit (40) is designed to keep the energizing voltage (V) continuously
applied to the said terminals (12a, 37a) after the first energizing or after each
first energizing of the locking device (1) for a predetermined time (t2-t1) in such a way that the resistance (R) of the PTC resistor (38) reaches and is kept
at a value such that the current (I) flowing through the solenoid (26) is reduced
to a minimum value and thus preventing the energizing of the solenoid.
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