1、COMMISSION ELECTROTECHNIQUE INTERNATIONALE(affrganisation Interationale de Normalisation-ISO)RECOMMANDATION DE LA CEIINTERNATIONAL ELECTROTECH NICAL COMMISSION(affitiated to the International Organizationfor Standardization-)IEC RECOMMENDATIONPublicatlon157-1Deuxieme edition-Second edition1973Modifi
2、ee selon:Complement A(1976)Amended in accordance with:Complement B(1979)Supplement A(1976)Supplement B(1979)eAwe+N1f有(Appareillage a basse.tensionMarch198 3Premiere partie:DisjoncteursLow-voltage switchgear and controlgearPart 1;Circuit-breakersDroits de reproduction servs-Copyright-all rights reser
3、vedBureau Central de la Commission Electrotechnique Internationale1,rue de VarembeGeneve,Suisse一7LOW-VOLTAGE SWITCHGEAR AND CONTROLGEARPart 1:Circuit-breakers1.General1.1ScopeThis recommendation applies to circuit-breakers,the main contacts of which are intendedto be connected.to circuits the rated
4、voltage of which does not exceed 1 000 V a.c.or1200 V d.c.;it also contains additional requirements for integrally-fused circuit-breakers.It applies whatever the rated currents,the method of construction(e.g.conventionalcircuit-breakers,moulded-case circuit-breakers)or the proposed applications of t
5、he circuit-breakers may be.Supplementary requirements for circuit-breakers ued asdirect-on-ine starters are givenin IEC Publication 292-1,Low-voltage Motor Starters.Part 1:Direct-on-line(full voltage)a.c.starters.The requirements for circuit-breakers intended to be accessible to and operated by unsk
6、illedpeople on domestic and similar installations are contained in Publication 157-2(underconsideration).Particular requirements for circuit-breakers which are also intended to provide earth-leakage protection are under consideration.fA。Note.-Circuit-breakers which are dealt with in this recommendat
7、ion may be provided with devices forautomatic opening under pre-determined conditions other than those of over-current and under-voltage as,for example,reversal of power or current.This recommendation does notdeal withthe verification of operation under such pre-determined conditions.1.2ObjectThe ob
8、ject of this recommendation is to state:1)the characteristics of circuit-breakers;2)the conditions with which circuit-breakers must comply with reference to:a)their operation and behaviour in normal service,b)their operation and behaviour in case of overload,c)their operation and behaviour in case o
9、f short-circuit,d)their dielectric properties;3)the tests intended for confirming that these conditions have been met and the methodsto be adopted for these tests;4)the data to be marked on the apparatus.2.DefinitionsFor the purpose of this recommendation,the following definitions shall apply:2.1Devices2.1.1Switching deviceA device designed to make or break the current in one or more electric circuits.