IEC_60337-2A-1973_scan.pdf

3CONTENTSPageFOREWORD.5PREFACE。5Clause1.General.71.1 Scope and object.72.Basic definitions and classification.73.Conditions for construction.114.Operating diagram.135.Tests135.1 Performance of tests.135.2 Special tests.13FIGURE.155-INTERNATIONAL ELECTROTECHNICAL COMMISSIONCONTROL SWITCHES(LOW-VOLTAGE SWITCHING DEVICESFOR CONTROL AND AUXILIARY CIRCUITS,INCLUDING CONTACTOR RELAYS)FIRST SUPPLEMENT TO PUBLICATION 337-2(1972)Part 2:Special requirements for specific typesof control switchesSECTION TWO:ADDITIONAL REQUIREMENTSFOR ROTARY CONTROL SWITCHESFOREWORD1)The formal decisions or agreements of the IEC on technical matters,prepared by Technical Committees on which all theNational Committees having a special interest therein are represented,express,as nearly as possible,an internationalconsensus of opinion on the subjects dealt with.2)They have the form of recommendations for international use and they are accepted by the National Committees in thatsense.3)In order to promote international unification,the IEC expresses the wish that all National Committees should adoptthe text of the I EC recommendation for their national rules in so far as national conditions will permit.Any divergencebetween the IEC recommendations and the corresponding national rules should,as far as possible,be clearlyindicated in the latter.PREFACEThis Recommendation has been prepared by Sub-Committee 17B,Low-Voltage Switchgear andControlgear,of IE C Technical Committee No.17,Switchgear and Controlgear.Pursuant to a decision taken during the meeting held in Brussels in June 1971,a first draft was circulatedin March 1972 and examined in Stockholm in September 1972.The final draft was submitted to theNational Committees in October 1972 for approval under the Six Months Rule.,The following countries voted explicitly in favour of publication:AustraliaNetherlandsAustriaNorwayBelgiumPortugalCanadaRomaniaDenmarkSouth AfricaEgyptSpainFinlandSwedenFranceSwitzerlandGermanyTurkeyHungaryUnion of Soviet Socialist RepublicsIsraelUnited KingdomItalyUnited States of AmericaJapanYugoslavia一9-2.4Independent manual operation(of a rotary switch)A stored energy operation where the energy originates from manual power,stored and releasedin one continuous operation,such that the speed and force of the operation are independent ofthe action of the operator.2.5 Actuating seriesA succession of operations,not forming an actuating cycle.2.6Definite position(abbreviation:Position)(of a rotary switch)A position into which the locating mechanism pulls the rotary switch and retains it as long asthe actuating moment does not exceed a certain value.2.6.1 Position of restA stable(definite)position into which the locating mechanism tends to move back and retainthe rotary switch by stored energy.2.6.2 Transit positionA(definite)position in which the locating mechanism produces an intended marked changein the operating moment,but in which the actuator cannot remain by itself.2.6.3 Biased positionA(definite)position of a rotary switch in which the actuator is pulled against a stop from whichit will return to a position of rest by means of stored energy(for example,by means of a spring).Nore.-During the transfer from a biased position to the adjacent position of rest,the rotary switch may passthrough one or more transit positions.2.6.4 Latched position0A biased position in which the return mechanism is held by a latching arrangement.Note.-The latching arrangement may be released manually or otherwise.2.6.5 Locked positionA(definite)position in which a rotary switch is secured by separate action.Note.-The locking may be obtained by turning a key,operating a lever,etc.2.7 Key-operated rotary switchA rotary switch where a key is used as the actuator.Note.-Key withdrawal may be provided at any position.2.8 Limited movement rotary switchA rotary switch with a restricted angular movement of its actuator.