Residual current transformer ND 5017 Features . The residual current transformer ND 5017 is designed for DIN rail mounting or screw-type mounting . Mounting on the top-hat rail may be done horizontally or vertically Technical specifications Diameter: 24, 70mm For relay type: RR 5887 Type: ND 5017 Manufacturer: E. Dold & Söhne GmbH & Co. KG Type: ND5017/024 Art. No.: 0066017