IS:4064 specification for normal duty air break switches & composers units of air break switches fuses for voltage exceeding 1000 v
Indian Standard Institute
IS:4064 specification for normal duty air break switches & composers units of air break switches fuses for voltage exceeding 1000 v - ISI 1967 - 21
IS:4064 specification for normal duty air break switches & composers units of air break switches fuses for voltage exceeding 1000 v - ISI 1967 - 21