3PR3 resistors are equipped with cast iron resistor elements 3PY6 which are installed in a steel sheet housing. Ceramic strips hold and insulate the resistor elements inside the housing. A heat shield separates the resistor zone from the terminal zone. Connecting pieces screwed to the resistor elements supported on ceramic hold strips are used for connecting the cables. Each resistor element can be provided with a connection. Changes or supplements regarding the connections are easy, even retroactively.