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  • IEC TR 61912-1:2007

    Current The latest, up-to-date edition.

    Low-voltage switchgear and controlgear - Overcurrent protective devices - Part 1: Application of short-circuit ratings

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

    Language(s):  English - French

    Published date:  23-08-2007

    Publisher:  International Electrotechnical Committee

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

    FOREWORD
    INTRODUCTION
    1 Scope
    2 Normative references
    3 Alphabetical list of definitions and characteristics
    4 Principle of application - Installation
    5 Characteristics - Low-voltage assemblies (switchboard,
      distribution board, etc.)
    6 Characteristics - Switching devices
      6.1 General
      6.2 Switching devices - Self-protection against short-circuit
      6.3 Switching devices - Application as SCPD
          6.3.1 Fuse-combination units and fuses as SCPD
          6.3.2 Circuit-breakers to IEC 60947-2 as SCPD
          6.3.3 Control and protective switching devices (CPS)
                according to IEC 60947-6-2 as SCPD
          6.3.4 Circuit-breakers according to IEC 60898-1 (MCBs)
                and residual current operated circuit-breaker with
                integral overcurrent protection (RCBOs) according
                to IEC 61009-1 as SCPD
    7 Examples of the practical application of the product
      characteristics
      7.1 General
      7.2 Protection of cables
      7.3 Short-circuit protection for LV assemblies
          7.3.1 Switchgear and controlgear assemblies
                (switchboard/motor-control centre (MCC))
          7.3.2 Busbar trunking systems (BTS)
      7.4 Short-circuit protection for contactors and starters
          7.4.1 General
          7.4.2 Protected switching device and protected starter
          7.4.3 Control and protective switching device (CPS)
                according to IEC 60947-6-2
      7.5 Short-circuit protection using circuit-breakers for
          household and similar installations according to
          IEC 60898-1 (usually known as MCBs) and residual
          current operated circuit-breakers with integral
          overcurrent protection (RCBOs) according to
          IEC 61009-1
    Annex A (informative) Interpolation of the suitability of an
            alternative SCPD for the protection of contactors and
            starters (substitution)
    Bibliography

    Abstract - (Show below) - (Hide below)

    This technical report, which serves as an application guide for the short-circuit ratings given in IEC standards for low-voltage switchgear and controlgear and assemblies, summarises the definitions of the ratings and provides examples of their application. This edition cancels and replaces the first edition of IEC 61912, published in 2006, and corrigendum 1 (May 2006). The changes are only editorial.

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

    Committee TC 121/SC 121A
    Development Note Supersedes IEC TR 61912. (08/2007) Stability Date: 2015. (10/2012)
    Document Type Technical Report
    Publisher International Electrotechnical Committee
    Status Current

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

    UNE-HD 50573.5.57:2014 Co-ordination of electrical equipment for protection, isolation, switching and control
    EN 61439-1:2011 Low-voltage switchgear and controlgear assemblies - Part 1: General rules
    CLC/TR 60269-5:2011 Low-voltage fuses - Part 5: Guidance for the application of low-voltage fuses
    IEC TR 61912-2:2009 Low-voltage switchgear and controlgear - Over-current protective devices - Part 2: Selectivity under over-current conditions
    EN 60947-1:2007/A2:2014 LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR - PART 1: GENERAL RULES (IEC 60947-1:2007/A2:2014)
    I.S. HD 50573-5-57:2014 CO-ORDINATION OF ELECTRICAL EQUIPMENT FOR PROTECTION, ISOLATION, SWITCHING AND CONTROL
    PD IEC/TR 61912-2:2009 Low-voltage switchgear and controlgear. Over-current protective devices Selectivity under over-current conditions
    IEC TR 60269-5:2014 Low-voltage fuses - Part 5: Guidance for the application of low-voltage fuses
    I.S. EN 61439-1:2011 LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR ASSEMBLIES - PART 1: GENERAL RULES (IEC 61439-1:2011)
    IEC 60204-1:2016 Safety of machinery - Electrical equipment of machines - Part 1: General requirements
    UNE-HD 60364-5-53:2016 Low-voltage electrical installations - Part 5-53: Selection and erection of electrical equipment - Switchgear and controlgear
    BS EN 60947-1 : 2007 LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR - PART 1: GENERAL RULES
    S.R. HD 60364-5-53:2015 LOW-VOLTAGE ELECTRICAL INSTALLATIONS - PART 5-53: SELECTION AND ERECTION OF ELECTRICAL EQUIPMENT - SWITCHGEAR AND CONTROLGEAR
    IEC 61439-1:2011 Low-voltage switchgear and controlgear assemblies - Part 1: General rules
    09/30204029 DC : 0 BS EN 61439-1 - LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR ASSEMBLIES - PART 1: GENERAL RULES
    IEC 60947-1:2007+AMD1:2010+AMD2:2014 CSV Low-voltage switchgear and controlgear - Part 1: General rules
    IEC 61439-1:2020 Low-voltage switchgear and controlgear assemblies - Part 1: General rules
    16/30301661 DC : 0 BS EN 61439-1 ED3.0 - LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR ASSEMBLIES - PART 1: GENERAL RULES
    I.S. EN 60947-1:2007 LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR - PART 1: GENERAL RULES
    HD 50573-5-57:2014 Co-ordination of electrical equipment for protection, isolation, switching and control
    S.R. CLC/TR 60269-5:2011 LOW-VOLTAGE FUSES - PART 5: GUIDANCE FOR THE APPLICATION OF LOW-VOLTAGE FUSES
    UNE-EN 61439-1:2012 Low-voltage switchgear and controlgear assemblies - Part 1: General rules
    PD IEC/TR 60269-5:2010 Low-voltage fuses Guidance for the application of low-voltage fuses
    BS EN 61439-1:2011 Low-voltage switchgear and controlgear assemblies General rules
    HD 60364-5-53:2015/A11:2017 LOW-VOLTAGE ELECTRICAL INSTALLATIONS - PART 5-53: SELECTION AND ERECTION OF ELECTRICAL EQUIPMENT - SWITCHGEAR AND CONTROLGEAR

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

    IEC 60947-6-2:2002+AMD1:2007 CSV Low-voltage switchgear and controlgear - Part 6-2: Multiple function equipment - Control and protective switching devices (or equipment) (CPS)
    IEC 60947-4-1:2009+AMD1:2012 CSV Low-voltage switchgear and controlgear - Part 4-1: Contactors and motor-starters - Electromechanical contactors and motor-starters
    IEC 60439-2:2000+AMD1:2005 CSV Low-voltage switchgear and controlgear assemblies - Part 2: Particular requirements for busbar trunking systems (busways)
    IEC 60269-1:2006+AMD1:2009+AMD2:2014 CSV Low-voltage fuses - Part 1: General requirements
    IEC 61009-1:2010+AMD1:2012+AMD2:2013 CSV Residual current operated circuit-breakers with integral overcurrentprotection for household and similar uses (RCBOs) - Part 1: General rules
    IEC 60947-1:2007+AMD1:2010+AMD2:2014 CSV Low-voltage switchgear and controlgear - Part 1: General rules
    IEC 60439-1:1999+AMD1:2004 CSV Low-voltage switchgear and controlgear assemblies - Part 1: Type-tested and partially type-tested assemblies
    IEC 60898-1:2015 Electrical accessories - Circuit-breakers for overcurrent protection for household and similar installations - Part 1: Circuit-breakers for a.c. operation
    IEC 60947-3:2008+AMD1:2012+AMD2:2015 CSV Low-voltage switchgear and controlgear - Part 3: Switches, disconnectors, switch-disconnectors and fuse-combination units
    IEC 60947-2:2016 Low-voltage switchgear and controlgear - Part 2: Circuit-breakers
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