axial axis of the elongated part 13c, onto which areriveted the fast-on terminals 18.The support element 13 is made of a thermal and electrical insulating material, such as mica, and is also light, its thickness being around 0.5 mm.The insulating element 14, shown in FIG. 7, has a similar geometry to that of the support element 13, with an elongated part 14c that passes through the radiant heater