IEC 60470 pdf download – High-voltage alternating current contactors and contactor-based motor-starters
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 1 000 v but not exceeding 12 00o v.
lt is applicable only to three-pole contactors and starters for use in three-phase systems,and single-pole contactors and starters for use in single-phase systems.Two-pole contactors andstarters for use in single-phase systems are subject to agreement between manufacturerand user.
Contactors and/or starters dealt with in this standard are not normally designed to interruptshort-circuit currents. Therefore，suitable short-circuit protection (see 3.4.110.12 and note 2below) forms part of the installation, but not necessarily of the contactor or the starter.
ln this context, this standard gives requirements for
contactors associated with overload and/or short-circuit protective devices (SCPD);
starters associated with separate short-circuit protective devices and/or with separateshort-circuit and integrated overload protective devices;
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.
Starters，the operation of which depends on thermal electrical relays for motor protectioncomplying with lEC 60255-8,or motor-incorporated thermal protective devices dealt with inIEC 60034-11, do not necessarily meet all the relevant requirements of this standard.
Overload relays for starters，including those based on solid-state technology,are covered bythis standard.
This standard does not apply to
– circuit-breaker-based motor-starters;
single-pole operation of multi-pole contactors or starters;
two-step auto-transformer starters designed for continuous operation in the startingposition;
unbalanced rheostatic rotor starters, i.e. where the resistances do not have the same valuein all phases;
equipment designed not only for starting, but also for adjustment of speed;liquid starters and those of the “liquid-vapour” type;
semiconductor contactors and starters making use of semiconductor contactors in themain circuit;
rheostatic stator starters;
– contactors or starters designed for special applications.
This standard does not deal with components contained in contactors and contactor-basedmotor-starters, for which individual specifications exist.
NOTE 1 Thermal electrical relays are covered by lEC 60255-8.
NOTE 2 High-voltage current-limiting fuses are covered by lEC 60282-1 and lEC 60644.
NOTE 3 Metal-enclosed switchgear and controlgear for rated voltages above 1 kVv and up to and including 52 kvare covered by IEC 60298.
NOTE 4Disconnectors and earthing switches are covered by IEC 60129.
NOTE 5 High-voltage switches above 1 kV and less than 52 kV are covered by IEC 60265-1.
The object of this standard is to state
a) the characteristics of contactors and starters and associated equipment;
b) the conditions with which contactors or starters shall comply with reference to:1) their operation and behaviour,
2) their dielectric properties,
3) the degrees of protection provided by their enclosures, where applicable,4) their construction,
5) for combinations，interactions between the various components，for example SCPD
co-ordination;
c) the tests intended for confirming that these conditions have been met, and the methods to
be adopted for these tests;
d) the information to be given with the equipment or in the manufacturer’s literature.
1 .2 Références normatives Les documents normatifs suivants contiennent des dispositions qui, par suite de la référence qui y est faite, constituent des dispositions valables pour la présente Norme internationale. Pour les références datées, les amendements ultérieurs ou les révisions de ces publications ne s’appliquent pas. Toutefois, les parties prenantes aux accords fondés sur la présente Norme internationale sont invitées à rechercher la possibilité d’appliquer les éditions les plus récentes des documents normatifs indiqués ci-après. Pour les références non datées, la dernière édition du document normatif en référence s’applique. Les membres de la CEI et de l’ISO possèdent le registre des Normes internationales en vigueur.
IEC 60470 pdf download – High-voltage alternating current contactors and contactor-based motor-starters
