An interface for providing thermal overload protection includes a switching device, a temperature indicating device, a drive circuit and a thermal monitoring circuit. The trapping method of the present invention comprises the use of an aqueous solution or slurry of an alkylene glycol polymer or an alkylene glycol copolymer, in which the alkylene has from 2 to 6 carbon atoms, in order to trap ruthenium present in a gaseous effluent. The body has plural straight superposed portions each formed by mutually superposing the plural straight portions. A corresponding heat-management method is implemented in the device for managing the temperature of an optical element. The first electrode has a sidewall surface.