Heating unit for conductive or corrosive fluids in motor vehicles has several PTC elements electrically insulated in heat conductive housing

摘要

The metallic housing (6) is in a rectangular tubular form and contains one or more PTC elements sandwiched between a plate (1) and a terminal strip (4) having electrical connections (7,12) insulated from the housing with aluminum oxide film. The housing is protected from corrosion (19).