... in exchanges 50/60Hz, the fixed working voltage is highest to 550V, nominal current In the 15-630A low pressure electrical power distribution ... system uses in protecting the distribution line and the ... to 1250A2.Technical parameters SpecificationNOM8C-100NOM8-250Number of Poles33Rated Current, In(A)15, 20, 25, 30, 40, 50, 60 ...