IEC 60470 pdf download.High-voltage alternating current contactors and contactor-based motor-starters 1 General 1 .1 Scope and object This International Standard is applicable to a.c. contactors and/or contactor-based motor- starters designed for indoor installation and operation at frequencies up to and including 60 Hz on systems having voltages above 1 000 V but not exceeding 1 2 000 V. It is...