Abstract： IEC 60470:2000 pdf free download.High-voltage alternating current contactors and contactor-based motor-starters. contactors or starters combined，under specified conditions，with their own short-circuitprotective devices. Such combination...

IEC 60470:2000 pdf free download.High-voltage alternating current contactors and contactor-based motor-starters.

contactors or starters combined，under specified conditions，with their own short-circuitprotective devices. Such combinations,for example combination starters(see 3.4.110.9),are rated as units.

Contactors intended for closing and opening electric circuits and,if combined with suitablerelays, for protecting these circuits

against operating overloads which may occur therein,arecovered in this standard.

This standard is also applicable to the operating devices of contactors and to their auxiliaryequipment.

Motor-starters intended to start and accelerate motors to normal speed, to ensure continuousoperation of motors，to switch off the supply from the motor and to provide means for theprotection of motors and associated circuits against operating overloads are

dealt with.

Motor-starter types included are

-direct-on-line starters;-reversing starters;

two-direction starters;

reduced kVA (voltage) starters;auto-transformer starters;

rheostatic starters;

-reactor starters.

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