ISO 1509:1973

Gives the requirements for circuit breakers having an inverse time/current characteristic, of normal ratings up to and including 35 A, for use in nominal 115/200 V three-phase 4OO Hz a. c. circuits. Includes definitions, design requirements, requirements for dimensions, construction, voltage and current ratings, environment, time/current characteristics, making and breaking capacity, endurance, tests, type tests, production tests, quality tests, declarations and marking.