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  • AS 3947.2-1997

    Superseded A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
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    Low-voltage switchgear and controlgear - Circuit-breakers

    Available format(s):  Hardcopy, PDF 1 User, PDF 3 Users, PDF 5 Users, PDF 9 Users

    Superseded date:  30-06-2017

    Language(s): 

    Published date:  01-01-1997

    Publisher:  Standards Australia

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    Table of Contents - (Show below) - (Hide below)

    1 - AS 3947.2-1997 LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR - CIRCUIT-BREAKERS
    4 - PREFACE
    6 - CONTENTS
    9 - 1 General
    9 - 1.1 Scope and object
    10 - 1.2 Normative references
    12 - 2 Definitions
    12 - 2.1 circuit-breaker:
    12 - 2.1.1 frame size:
    12 - 2.1.2 construction break:
    12 - 2.2 integrally fused circuit-breaker:
    12 - 2.3 current-limiting circuit-breaker:
    12 - 2.4 plug-in circuit-breaker:
    12 - 2.5 withdrawable circuit-breaker:
    13 - 2.6 moulded-case circuit-breaker:
    13 - 2.7 air circuit-breaker:
    13 - 2.8 vacuum circuit-breaker:
    13 - 2.9 gas circuit-breaker:
    13 - 2.10 making-current release:
    13 - 2.11 short-circuit release:
    13 - 2.12 short-time delay short-circuit release:
    13 - 2.13 alarm switch:
    13 - 2.14 circuit-breaker with lock-out device preventing closing:
    13 - 2.15 short-circuit breaking (or making) capacity:
    13 - 2.15.1 ultimate short-circuit breaking capacity:
    13 - 2.15.2 service short-circuit breaking capacity:
    13 - 2.16 opening time:
    13 - 2.17 over-current protective co-ordination:
    13 - 2.17.1 over-current discrimination:
    14 - 2.17.2 total discrimination (total selectivity):
    14 - 2.17.3 partial discrimination (partial selectivity):
    14 - 2.17.4 selectivity limit current (Is):
    14 - 2.17.5 back-up protection:
    14 - 2.17.6 take-over current (IB):
    14 - 2.18 I2t characteristic of a circuit-breaker
    14 - 3 Classification
    15 - 4 Characteristics of circuit-breakers
    15 - 4.1 Summary of characteristics
    15 - 4.2 Type of circuit-breaker
    15 - 4.2.1 Number of poles
    15 - 4.2.2 Kind of current
    15 - 4.3 Rated and limiting values of the main circuit
    16 - 4.3.1 Rated voltages
    16 - 4.3.2 Currents
    16 - 4.3.3 Rated frequency
    17 - 4.3.4 Rated duty
    17 - 4.3.5 Short-circuit characteristics
    19 - 4.4 Utilization categories
    20 - 4.5 Control circuits
    20 - 4.5.1 Electrical control circuits
    20 - 4.5.2 Air-supply control circuits (pneumatic or electro-pneumatic)
    20 - 4.6 Auxiliary circuits
    21 - 4.7 Releases
    21 - 4.7.1 Types
    21 - 4.7.2 Characteristics
    21 - 4.7.3 Current setting of over-current releases
    22 - 4.7.4 Tripping time setting of over-current releases
    22 - 4.8 Integral fuses (integrally fused circuit-breakers)
    22 - 4.9 Switching overvoltages
    22 - 5 Product information
    22 - 5.1 Nature of the information
    23 - 5.2 Marking
    24 - 5.3 Instructions for installation, operation and maintenance
    24 - 6 Normal service, mounting and transport conditions
    24 - 7 Constructional and performance requirements
    24 - 7.1 Constructional requirements
    24 - 7.1.1 Withdrawable circuit-breakers
    25 - 7.1.2 Additional requirements for circuit-breakers suitable for isolation
    25 - 7.1.3 Clearances and creepage distances
    25 - 7.1.4 Requirements for the safety of the operator
    25 - 7.1.5 List of construction breaks
    26 - 7.2 Performance requirements
    26 - 7.2.1 Operating conditions
    28 - 7.2.2 Temperature-rise
    29 - 7.2.3 Dielectric properties
    29 - 7.2.4 Ability to make and break under no load, normal load and overload conditions
    30 - 7.2.5 Ability to make and break under short-circuit conditions
    30 - 7.2.6 Switching overvoltages
    30 - 7.2.7 Additional requirements for circuit-breakers suitable for isolation
    30 - 7.2.8 Specific requirements for integrally fused circuit-breakers
    31 - 7.2.9 Coordination between a circuit-breaker and another short-circuit protective device
    31 - 7.3 Electromagnetic compatibility (EMC)
    31 - 7.3.1 General
    31 - 7.3.2 Immunity
    31 - 7.3.3 Emission
    32 - 8 Tests
    32 - 8.1 Kind of tests
    32 - 8.1.1 The tests to verify the characteristics of circuit-breakers are:
    32 - 8.1.2 Type tests include the following tests:
    32 - 8.1.3 Routine or sampling tests include the following tests:
    32 - 8.2 Compliance with constructional requirements
    33 - 8.3 Type tests
    33 - 8.3.1 Test sequences
    36 - 8.3.2 General test conditions
    44 - 8.3.3 Test sequence I: General performance characteristics
    53 - 8.3.4 Test sequence II: Rated service short-circuit breaking capacity
    54 - 8.3.5 Test sequence III: Rated ultimate short-circuit breaking capacity
    56 - 8.3.6 Test sequence IV: Rated short-time withstand current
    57 - 8.3.7 Test sequence V: Performance of integrally fused circuit-breakers
    59 - 8.3.8 Combined test sequence
    60 - 8.3.9 Immunity tests for circuit-breakers incorporating electronic circuits, other than circuit-breakers according to annex
    60 - 8.4 Routine tests
    61 - 8.4.1 Mechanical operation tests
    61 - 8.4.2 Verification of the calibration of overcurrent releases
    61 - 8.4.3 Verification of the operation of undervoltage and shunt releases
    62 - 8.4.4 Additional tests for CBRs
    62 - 8.4.5 Dielectric tests
    62 - 8.4.6 Test for the verification of clearances less than those corresponding to case A of table 13 of part 1
    64 - Annex A - Coordination under short-circuit conditions between a circuit-breaker and another short-circuit protective device
    64 - A.1 Introduction
    65 - A.2 Scope and object
    65 - A.3 General requirements for the coordination of a circuit-breaker with another SCPD
    65 - A.4 Type and characteristics of the associated SCPD
    66 - A.5 Verification of discrimination
    66 - A.6 Verification of back-up protection
    73 - Annex B - Circuit-breakers incorporating residual current protection
    73 - INTRODUCTION
    73 - B.1 Scope and object
    74 - B.2 Definitions
    75 - B.3 Classification
    76 - B.4 Characteristics of CBRs concerning their residual current function
    78 - B.5 Marking
    79 - B.6 Normal service, mounting and transport conditions
    79 - B.7 Design and operating requirements
    83 - B.8 Tests
    107 - Annex C - Individual pole short-circuit test sequence
    107 - C.1 General
    107 - C.2 Test of individual pole short-circuit breaking capacity
    107 - C.3 Verification of dielectric withstand
    107 - C.4 Verification of overload releases
    108 - Annex D - Clearances and creepage distances
    108 - D.1 General
    108 - D.2 Determination of clearances and creepage distances
    109 - Annex E - Items subject to agreement between manufacturer and user
    110 - Annex F - Additional requirements for circuit-breakers with electronic over-current protection
    110 - F.1 Scope
    110 - F.2 List of tests
    111 - F.3 General test conditions
    112 - F.4 Immunity tests regarding low-frequency disturbances in power supply networks
    115 - F.5 Immunity tests regarding conducted transients and high-frequency disturbances
    116 - F.6 Immunity tests regarding electrostatic disturbances
    117 - F.7 Immunity tests regarding electromagnetic field disturbances
    118 - F.8 Dry heat test
    119 - F.9 Thermal shock test
    119 - F.10 Damp heat test
    119 - F.11 Tests for radiated radiofrequency emissions
    125 - Annex G - Power loss
    125 - G.1 General
    125 - G.2 Test methods
    126 - G.3 Test procedure
    128 - Annex H - Test sequence for circuit-breakers for IT systems
    128 - H.1 General
    128 - H.2 Individual pole short circuit
    129 - H.3 Verification of dielectric withstand
    129 - H.4 Verification of overload releases
    129 - H.5 Marking

    Abstract - (Show below) - (Hide below)

    Specifies requirements for circuit-breakers, the main contacts of which are intended to be connected to circuits, the rated voltage of which does not exceed 1000 volt a.c. or 1500 volt d.c. It includes requirements for co-ordination under short-circuit conditions between a circuit-breaker and another short-circuit protective device associated in the same circuit. This Standard is identical with and has been reproduced from IEC 947-2:1995.

    Scope - (Show below) - (Hide below)

    This standard applies to circuit-breakers, the main contacts of which are intended to be connected to circuits, the rated voltage of which does not exceed 1 000 V a.c. or 1 500 V d.c.; it also contains additional requirements for integrally fused circuit-breakers.It applies whatever the rated currents, the method of construction or the proposed applications of the circuit-breakers may be.The requirements for circuit-breakers which are also intended to provide earth-leakage protection are contained in annex B.The additional requirements for circuit-breakers with electronic over-current protection are contained in annex F.The additional requirements for circuit-breakers for IT systems are contained in annex H.Supplementary requirements for circuit-breakers used as direct-on-line starters are given in IEC 947-4-1, applicable to low-voltage contactors and starters.The requirements for circuit-breakers for the protection of wiring installations in buildings and similar applications, and designed for use by uninstructed persons, are contained in IEC 898.The requirements for circuit-breakers for equipment (for example electrical appliances) are contained in IEC 934.For certain specific applications (for example traction, rolling mills, marine service) particular or additional requirements may be necessary.NOTE - Circuit-breakers which are dealt with in this standard may be provided with devices for automatic opening under predetermined conditions other than those of over-current and undervoltage as, for example, reversal of power or current. This standard does not deal with the verification of operation under such predetermined conditions.The object of this standard is to state:a) the characteristics of circuit-breakers;b) the conditions with which circuit-breakers shall comply with reference to:1) operation and behaviour in normal service;2) operation and behaviour in case of overload and operation and behaviour in case of short-circuit, including co-ordination in service (discrimination and back-up protection);3) dielectric properties;c) tests intended for confirming that these conditions have been met and the methods to be adopted for these tests;d) information to be marked on or given with the apparatus.

    General Product Information - (Show below) - (Hide below)

    Committee EL-006
    Document Type Standard
    Publisher Standards Australia
    Status Superseded
    Superseded By
    Supersedes
    Under Revision

    History - (Show below) - (Hide below)

    Amendment 1 see DR 00369 CP. Under Revision see DR 02332 CP First published as AS 3858-1990.Revised and redesignated AS 3947.2-1997. First published as AS 3858-1990. Revised and redesignated AS 3947.2-1997.

    Standards Referenced By This Book - (Show below) - (Hide below)

    AS 3000-1986 Electrical installations - Buildings, structures and premises (known as the SAA Wiring Rules)
    AS 2005.21.1-1990 Low voltage fuses - Fuses with enclosed fuse-links Supplementary requirements for fuses for use by authorized persons (Fuses mainly for industrial application) - Standardized fuse systems - Fuses with fuse-links with blade contacts
    AS/NZS 3175.1:1994 Approval and test specification - Residual current-operated circuit-breakers without integral overcurrent protection for household and similar uses (RCCB’s) General rules
    AS 2005.21.2-1990 Low voltage fuses - Fuses with enclosed fuse-links Supplementary requirements for fuses for use by authorized persons (Fuses mainly for industrial application) - Standardized fuse systems - Fuses with fuse-links for bolted connections
    AS 3947.4.1-1995 Low-voltage switchgear and controlgear - Contactors and motor-starters - Electromechanical contactors and motor-starters
    AS 2005.29-1990 Low voltage fuses - Fuses with enclosed fuse-links Supplementary requirements for fuses for use by authorized persons (Fuses mainly for industrial application) - Standardized fuses with compact dimensions
    AS 2005.10-1988 Low voltage fuses - Fuses with enclosed fuse-links - General requirements
    AS/NZS 4898:1997 Approval and test specification - Circuit-breakers for overcurrent protection for household and similar installations
    AS/NZS 4695.112:1996 Fire hazard testing of electrotechnical products Method for determining the comparative and the proof tracking indices of solid insulating materials under moist conditions
    AS 2005.30-1991 Low voltage fuses - Fuses with enclosed fuse-links - Supplementary requirements for fuses for use by unskilled persons (fuses mainly for household and similar applications)
    AS 3947.1-1993 Low-voltage switchgear and controlgear General rules

    Standards Referencing This Book - (Show below) - (Hide below)

    AS/NZS 3947.3:2001 Low-voltage switchgear and controlgear Switches, disconnectors, switch-disconnectors and fuse-combination units
    AS/NZS 3947.6.1:2001 Low-voltage switchgear and controlgear Multiple Function equipment - Automatic transfer switching equipment
    AS/NZS 3439.2:2002 Low-voltage switchgear and controlgear assemblies Particular requirements for busbar trunking systems (busways)
    AS/NZS 3000:2000 Electrical installations (known as the Australian/New Zealand Wiring Rules)
    AS/NZS 3947.4.1:2001 Low-voltage switchgear and controlgear Contactors and motor-starters - Electromechanical contactors and motor-starters
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