This standard applies to controllers and starters, which may include a series mechanical switching device, intended to be connected to circuits, the rated voltage of which does not exceed 1 000 V a.c. This standard characterizes controllers and starters for use with or without bypass switching devices. This standard does not apply to: - continuous operation of a.c. motors at motor speeds other than the normal speed; - semiconductor equipment, including semiconductor contactors (see 2.2.13 of IEC 60947-1) controlling non-motor loads; - electronic a.c. power controllers covered by IEC 60146.