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  • AS/NZS 3947.2:2002

    Superseded A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.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    Superseded date:  30-06-2017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):  English

    Published date:  07-11-2002

    Publisher:  Standards Australia

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

    1 - AS/NZS 3947.2:2002 LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR - CIRCUIT-BREAKERS
    4 - PREFACE
    6 - CONTENTS
    11 - 1 General
    11 - 1.1 Scope and object
    12 - 1.2 Normative references
    15 - 2 Definitions
    15 - 2.1 circuit-breaker
    15 - 2.1.1 frame size
    15 - 2.1.2 construction break
    16 - 2.2 integrally fused circuit-breaker
    16 - 2.3 current-limiting circuit-breaker
    16 - 2.4 plug-in circuit-breaker
    16 - 2.5 withdrawable circuit-breaker
    16 - 2.6 moulded-case circuit-breaker
    16 - 2.7 air circuit-breaker
    16 - 2.8 vacuum circuit-breaker
    16 - 2.9 gas circuit-breaker
    16 - 2.10 making-current release
    17 - 2.11 short-circuit release
    17 - 2.12 short-time delay short-circuit release
    17 - 2.13 alarm switch
    17 - 2.14 circuit-breaker with lock-out device preventing closing
    17 - 2.15 short-circuit breaking (or making) capacity
    17 - 2.15.1 ultimate short-circuit breaking capacity
    17 - 2.15.2 service short-circuit breaking capacity
    17 - 2.16 opening time
    17 - 2.17 over-current protective co-ordination
    17 - 2.17.1 over-current discrimination
    18 - 2.17.2 total discrimination (total selectivity)
    18 - 2.17.3 partial discrimination (partial selectivity)
    18 - 2.17.4 selectivity limit current
    18 - 2.17.5 back-up protection
    18 - 2.17.6 take-over current
    18 - 2.18 characteristic of a circuit-breaker
    18 - 3 Classification
    19 - 4 Characteristics of circuit-breakers
    19 - 4.1 Summary of characteristics
    20 - 4.2 Type of circuit-breaker
    20 - 4.2.1 Number of poles
    20 - 4.2.2 Kind of current
    20 - 4.3 Rated and limiting values of the main circuit
    20 - 4.3.1 Rated voltages
    20 - 4.3.2 Currents
    21 - 4.3.3 Rated frequency
    21 - 4.3.4 Rated duty
    21 - 4.3.5 Short-circuit characteristics
    24 - 4.4 Utilization categories
    24 - 4.5 Control circuits
    24 - 4.5.1 Electrical control circuits
    25 - 4.5.2 Air-supply control circuits (pneumatic or electro-pneumatic)
    25 - 4.6 Auxiliary circuits
    25 - 4.7 Releases
    25 - 4.7.1 Types
    25 - 4.7.2 Characteristics
    25 - 4.7.3 Current setting of over-current releases
    26 - 4.7.4 Tripping time setting of over-current releases
    26 - 4.8 Integral fuses (integrally fused circuit-breakers)
    26 - 4.9 Switching overvoltages
    26 - 5 Product information
    26 - 5.1 Nature of the information
    27 - 5.2 Marking
    28 - 5.3 Instructions for installation, operation and maintenance
    28 - 6 Normal service, mounting and transport conditions
    28 - 7 Constructional and performance requirements
    28 - 7.1 Constructional requirements
    29 - 7.1.1 Withdrawable circuit-breakers
    29 - 7.1.2 Additional requirements for circuit-breakers suitable for isolation
    29 - 7.1.3 Clearances and creepage distances
    29 - 7.1.4 Requirements for the safety of the operator
    29 - 7.1.5 List of construction breaks
    30 - 7.1.6 Additional requirements for circuit-breakers provided with a neutral pole
    30 - 7.2 Performance requirements
    30 - 7.2.1 Operating conditions
    33 - 7.2.2 Temperature-rise
    34 - 7.2.3 Dielectric properties
    34 - 7.2.4 Ability to make and break under no load, normal load and overload conditions
    35 - 7.2.5 Ability to make and break under short-circuit conditions
    35 - 7.2.6 Vacant
    35 - 7.2.7 Additional requirements for circuit-breakers suitable for isolation
    35 - 7.2.8 Specific requirements for integrally fused circuit-breakers
    35 - 7.2.9 Coordination between a circuit-breaker and another short-circuit protective device
    35 - 7.3 Electromagnetic compatibility (EMC)
    35 - 7.3.1 General
    36 - 7.3.2 Immunity
    36 - 7.3.3 Emission
    37 - 8 Tests
    37 - 8.1 Kind of tests
    37 - 8.2 Compliance with constructional requirements
    37 - 8.3 Type tests
    38 - 8.3.1 Test sequences
    69 - Annex A - Coordination under short-circuit conditions betweena circuit-breaker and another short-circuit protective device...
    69 - A.1 Introduction
    70 - A.2 Scope and object
    70 - A.3 General requirements for the coordination of a circuit-breaker with another SCPD
    70 - A.4 Type and characteristics of the associated SCPD
    71 - A.5 Verification of discrimination
    71 - A.6 Verification of back-up protection
    78 - Annex B - Circuit-breakers incorporating residual current protection
    78 - B.1 Scope and object
    79 - B.2 Definitions
    81 - B.3 Classification
    82 - B.4 Characteristics of CBRs concerning their residual current function
    84 - B.5 Marking
    85 - B.6 Normal service, mounting and transport conditions
    85 - B.7 Design and operating requirements
    88 - B.8 Tests
    114 - Annex C - Individual pole short-circuit test sequence
    114 - C.1 General
    114 - C.2 Test of individual pole short-circuit breaking capacity
    114 - C.3 Verification of dielectric withstand
    114 - C.4 Verification of overload releases
    115 - Annex D - Clearances and creepage distances
    115 - D.1 General
    115 - D.2 Determination of clearances and creepage distances
    116 - Annex E - Items subject to agreement between manufacturer and user
    117 - Annex F - Additional tests for circuit-breakers with electronic over-current protection
    117 - F.1 Scope
    117 - F.2 List of tests
    119 - F.3 General test conditions
    120 - F.4 Immunity tests
    157 - Annex G - Power loss
    157 - G.1 General
    157 - G.2 Test methods
    158 - G.3 Test procedure
    160 - Annex H - Test sequence for circuit-breakers for IT systems
    160 - H.1 General
    160 - H.2 Individual pole short circuit
    161 - H.3 Verification of dielectric withstand
    161 - H.4 Verification of overload releases
    161 - H.5 Marking
    162 - Annex J - Electromagnetic compatibility (EMC) - Requirements and tests for circuit-breakers
    164 - Annex K - Glossary of symbols related to products covered by this standard
    167 - Annex L - Circuit-breakers not fulfilling the requirements for overcurrent protection

    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. Includes requirements for coordination 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 60947-2:2001.

    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 60947-4-1, 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 60898. The requirements for circuit-breakers for equipment (for example electrical appliances) are contained in IEC 60934. 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 pre-determined 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)

    First published as AS 3858-1990.Revised and redesignated AS 3947.2-1997.Jointly revised and designated AS/NZ 3947.2:2002. First published as AS 3858-1990. Revised and redesignated AS 3947.2-1997. Jointly revised and designated AS/NZ 3947.2:2002.

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

    AS/NZS 61009.1:1999 Residual current operated circuit breakers with integral overcurrent protection for household and similar uses (RCBOs) General rules
    AS/NZS 2064:1997 Limits and methods of measurement of electromagnetic disturbance characteristics of industrial, scientific and medical (ISM) radiofrequency equipment
    AS/NZS 61000.4.6:1999 Electromagnetic compatibility (EMC) Testing and measurement techniques - Immunity to conducted disturbances, induced by radio-frequency fields
    AS/NZS 3947.1:2001 Low-voltage switchgear and controlgear General rules
    AS/NZS 3947.4.1:2001 Low-voltage switchgear and controlgear Contactors and motor-starters - Electromechanical contactors and motor-starters
    AS/NZS 60269.3.0:2000 Low-voltage fuses Supplementary requirements for fuses for use by unskilled persons (fuses mainly for household and similar applications)
    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/NZS 60269.2.1:2001 Low-voltage fuses Supplementary requirements for fuses for use by authorized persons (fuses mainly for industrial application) - Sections I to V: Examples of types of standardized fuses
    AS/NZS 4898:1997 Approval and test specification - Circuit-breakers for overcurrent protection for household and similar installations
    AS/NZS 60269.1:2000 Low-voltage fuses General requirements
    AS/NZS 61000.3.3:1998 Electromagnetic compatibility (EMC) Limits - Limitation of voltage fluctuations and flicker in low-voltage supply systems for equipment with rated current less than or equal to 16 A
    AS/NZS 61000.4.5:1999 Electromagnetic compatibility (EMC) Testing and measurement techniques - Surge immunity test
    AS/NZS CISPR 22:2002 Information technology equipment - Radio disturbance characteristics - Limits and methods of measurement
    AS/NZS 61000.3.2:1998 Electromagnetic compatibility (EMC) Limits - Limits for harmonic current emissions (equipment input current less than or equal to 16 A per phase)
    AS/NZS 61000.4.3:1999 Electromagnetic compatibility (EMC) Testing and measurement techniques - Radiated radio-frequency electromagnetic field immunity test
    AS/NZS 60695.2.12:2001 Fire hazard testing Glowing/hot wire based test methods - Glow-wire flammability test method for materials
    AS/NZS 60695.2.11:2001 Fire hazard testing Glowing/hot wire based test methods – Glow-wire flammability test method for end-products (IEC 60695-2-11:2000, MOD)
    AS/NZS 60695.2.13:2001 Fire hazard testing Glowing/hot wire based test methods - Glow-wire ignitability test method for materials (IEC 60695-2-13:2000, IDT)
    AS/NZS 60695.2.10:2001 Glowing/hot wire based test methods Glow-wire apparatus and common test procedure
    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/NZS 3000:2000 Electrical installations (known as the Australian/New Zealand Wiring Rules)
    AS/NZS 61000.4.2:2002 Electromagnetic compatibility (EMC) Testing and measurement techniques - Electrostatic discharge immunity test

    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 3947.3:2001 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 3012:2003 Electrical installations - Construction and demolition sites
    AS 2650-2005 Common specifications for high-voltage switchgear and controlgear standards (IEC 60694 Ed.2.2(2002) MOD)
    AS/NZS 3947.4.1:2001 Low-voltage switchgear and controlgear Contactors and motor-starters - Electromechanical contactors and motor-starters
    AS/NZS 3000:2018 (Unamended Hardcopy + Amendments) Electrical installations (known as the Australian/New Zealand Wiring Rules)
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