A power circuit interrupter includes a housing having an opening, one or more vacuum interrupters including separable contacts, and an operating mechanism, supported by the housing, adapted to open and close the contacts. A conductive layer is provided on a substarte and a thin, patterned catalyst array is deposited on an exposed surface of the conductive layer. The avoidance of quenching reduces the risk of damage to the article. 5 nanometers the second metal layer has a thickness greater than about 10 nm. The microwave energy interactive material may be operative for converting at least a portion of impinging microwave energy into heat. This material is obtained by a preparation method comprising the steps consisting of:a) providing a silicon powder obtained by the plasma-enhanced chemical vapor deposition technique or by CO2 laser, the size of the silicon particles being less than 100 nm;b) mixing the silicon powder with a carbon-containing polymer, andc) carrying out the pyrolysis of the mixture.