IEC 60934:2000 pdf free download – Circuit-breakers for equipment (CBE)
1 Scope and object
This International Standard is applicable to mechanical switching devices designed as “circuit-breakers for equipment”(CBE) intended to provide protection to circuits within electricalequipment.
NOTE 1 The term “equipment” includes appliances.
NOTE 2 The protected components are usually motors,transformers, internal wiring,etc.
CBEs may have a rated short-circuit capacity higher than that required for overload conditionsand may，in addition，have a conditional short-circuit current rating in association with aspecified short-circuit protective device (sCPD).
This standard is also applicable to switching devices for protection of electrical equipment incase of undervoltage andor overvoltage.
lt is applicable for a.c. not exceeding 440 V and/or d.c. not exceeding 250 V and a ratedcurrent not exceeding 125 A.
This standard covers CBEs which are intended for
– automatic interruption and non-automatic or automatic resetting;
automatic interruption and non-automatic or automatic resetting and manual switchingoperation.
lt also covers CBE-switches, in which the means for automatic interruption are inhibited or notpresent by construction (see 3.1.3).
NOTE 3 This standard may be used as a guiding document for voltages up to 63o v a.c.NOTE 4 Requirements for CBEs suitable for isolation are under consideration.
This standard contains all the requirements necessary to ensure compliance with theoperational characteristics required for these devices by type tests.
lt also contains the details relative to test requirements and methods of testing necessary toensure reproducibility of test results.
2Normative references
The following normative documents contain provisions which，through reference in this text,constitute provisions of this International Standard. For dated references,subsequentamendments to,or revisions of,any of these publications do not apply.However，parties toagreements based on this International Standard are encouraged to investigate the possibilityof applying the most recent editions of the normative documents indicated below.For undatedreferences, the latest edition of the normative document referred to applies. Members of lSOand lEC maintain registers of currently valid International Standards.
IEC 60060-1:1989，High-voltage test techniques – Part 1: General definitions and testrequirements
IEC 60068-2-20:1979,Environmental testing – Part 2:Tests – Test T: Soldering
IEC 60099-1:1991,Surge arresters – Part 1: Non-linear resistor type gapped arresters for a.c.systems 1)
IEC 60227(all parts)，Polyvinyl chloride insulated cables of rated voltages up to and including450/750 v
IEC60269(all parts),Low-voltage fuses
IEC 60417-1:1998，Graphical symbols for use on equipment – Part 1: Overview andapplication
IEC 60529:1989,Degrees of protection provided by enclosures (IP Code)
IEC 60664(all parts), Insulation coordination for equipment within low-voltage systems
IEC 60664-1:1992,Insulation coordination for equipment within low-voltage systems – Part 1:Principles,requirements and tests
IEC 60664-3:1992,Insulation coordination for equipment within low-voltage systems – Part 3:Use of coatings to achieve insulation coordination of printed board assemblies
IEC 60695-2-1 (all sheets)，Fire hazard testing – Part 2:Test methods – Section 1: Glow-wiretest methods
IEC 60898:1995，Electrical accessories – Circuit-breakers for overcurrent protection forhousehold and similar installations
IEC 60947-1:1999,Low-voltage switchgear and controlgear – Part 1: General rules
IEC 60950:1999,Safety of information technology equipment
3.1.6 mechanical switching device
switching device designed to close and open one or more electric circuits by means ofseparable contacts [lEV 441-14-02]
3.1.7 switch (mechanical)
mechanical switching device capable of making, carrying and breaking currents under normalcircuit conditions which may include specified operating overload conditions and also carryingfor a specified time currents under specified abnormal circuit conditions such as those ofshort circuit [IEV 441-14-10]
3.1.8 disconnector
mechanical switching device which in the open position complies with the requirementsspecified for the isolating function [IEV 441-14-05,modified]
3.1.9 disconnection
interruption of an electrical circuit in a pole so as to provide insulation between the supply andthose parts intended to be disconnected from the supply