1.1 Scope and objectThis part of IEC 62271 is applicable to a.c. contactors and/or contactor-based controllers and 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 24 000 V. It is applicable only to three-pole devices for use in three-phase systems, and single-pole devices for use in single-phase systems. Two-pole contactors and starters for use in singlephase systems are subject to agreement between manufacturer and user.Contactors and/or starters dealt with in this standard typically do not have adequate short-circuit interruption capability. I