NF C63-078:1987 LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR FOR INDUSTRIAL USE. INDUCTIVE PROXIMITY SWITCHES. FORM D,FOR DIRECT CURRENT,3 OR 4 TERMINALS. (EUROPEAN STANDARD EN 50 026).
1987NF C63-078:1987 LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR FOR INDUSTRIAL USE. INDUCTIVE PROXIMITY SWITCHES. FORM D,FOR DIRECT CURRENT,3 OR 4 TERMINALS. (EUROPEAN STANDARD EN 50 026).