BRITISH STANDARD 775: PART 1 & 2: SPECIFICATIONS FOR CONTACTORS. BRITISH STABDARD INSTITUTION. PART.1: CONTACTORS FOR VOLTAGES UP TO AND INCLUDING 1000 VOLTS A.C. AND 1200 VOLTS D.C. 58 PÁGINAS. PART.2: A.C. CONTACTORS FOR VOLTAGES ABOVE 1000 VOLTS AND UP TO AND INCLUDING 11000 VOLTS. 27 PÁGINAS. ILUSTRADO.