Abstract: A insulating body supports contact pins which are insulated against each other and extend from the outside through the insulating body to the inside. At the inner side which in use is enclosed in a housing of the appliance and thus is not accessible from the outside, at least one electrical fuse is located which is connected in an electrically conducting manner to the corresponding contact pin and the corresponding inner connecting member. An exchanging of the fuse wire insert is possible only from the inner side when the housing of the appliance has been opened, thus only by a skilled person. This allows a simple and low cost solution.