IEC TR 61912-1 : 1.0

LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR - OVERCURRENT PROTECTIVE DEVICES - PART 1: APPLICATION OF SHORT-CIRCUIT RATINGS

International Electrotechnical Committee

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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

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.