NF C63-071:1987 LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR FOR INDUSTRIAL USE. INDUCTIVE PROXIMITY SWITCHES. FORM A,FOR DIRECT CURRENT,2 TERMINALS. (EUROPEAN STANDARD EN 50 040).
1987NF C63-071:1987 LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR FOR INDUSTRIAL USE. INDUCTIVE PROXIMITY SWITCHES. FORM A,FOR DIRECT CURRENT,2 TERMINALS. (EUROPEAN STANDARD EN 50 040).