Tubular insulating insert defining spark gap

摘要

At least one of the two parts collar (2) or cap (3) for forming the desired spark gap is assigned an annular flange (10) protruding in the cavity (11). The annular flange (10) is assigned to the collar (2). The inner surface of the tubular insulating insert at least in the region of each collar (2) where the annular flange (10) is located is provided with an electrically insulating coating (12). An electric potential build up is discharged at a particular place in a controlled manner.