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 Hzon systems having voltages above 1 00o v but not exceeding 12 000 v. lt is applicable only to...