You are looking at schematics diagram the Special Applications in portable document format which is listed in Library Reference datasheet archive category. This Special Applications pdf file was obtained from www.designers.schneider-electric.ru
Content : 4p 3d + N/ 2 Neutral Protection At Half The Value Of The Phase Pick-up, I.e. 0.5 X Ir .. General Instrument W06 Or. Semikron Skb At 1.2/1.3. 380/420 V. Semikron