IEC 60077-4:2003

FOREWORD
INTRODUCTION
1 Scope
2 Normative references
3 Definitions
  3.1 Components
  3.2 Component parts
  3.3 Operational features
  3.4 Making and breaking characteristics - See Annex B
4 Classification
5 Characteristics
  5.1 Summary of characteristics
  5.2 Type of circuit-breaker
  5.3 Rated values and limiting values for the main
      circuit
  5.4 Operational frequencies
  5.5 Electric and pneumatic control circuits
  5.6 Electric and pneumatic auxiliary circuits
  5.7 Over-current release
  5.8 Recovery voltages
6 Product information
  6.1 Component documentation
  6.2 Marking
7 Normal service conditions
8 Constructional and performance requirements
  8.1 Constructional requirements
  8.2 Performance requirements
9 Tests
  9.1 Kind of tests
  9.2 Tests for verification of constructional
      requirements
  9.3 Type tests for verification of performance
      requirements
  9.4 Routine tests for verification of performance
      requirements
Annex A (informative) - Test circuit to verify the making
                        and breaking capacities
Annex B (informative) - Determination of short-circuit
                        making and breaking currents,
                        and of percentage DC component
Figures
Tables

Gives rules for AC circuit-breakers, the main contacts of which are to be connected to AC overhead contact lines; the nominal voltage of these circuits is in accordance with IEC 60850. Complements the general requirements given in IEC 60077-2.