IEC TR 61912-1:2007

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

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.