Abstract: A temperature supervising system comprising a temperature sensor which is designed to sense the temperature of the supervised component and to supply a signal representing the temperature, which signal is compared with a reference signal to produce an alarm or to interrupt the connection of the component to a supply source when the difference between the signal indicating the temperature and the reference signal exceeds a given value, for example zero. The reference signal is generated by a function generator which supplies a signal varying with time, which signal, in a period immediately after the instant the component is connected to its current source, increases according to any desired function, for example stepwise or linearly, from a low initial value to a higher output value.

Abstract: A microwave oven having an access door comprising a metal door frame with a choke cavity and a perforated metal sheet covering the area inside the frame. The door frame consists of a U-shaped metal profile with the legs of the U oriented in the plane of the door so as to effect an energy seal between the frame and the perforated metal sheet by pressing the sheet against the outside planar area of one of the legs of the profile.