IEC 60077-3:2001

FOREWORD
1 Scope and object
2 Normative references
3 Definitions
   3.1 Components
   3.2 Component parts
   3.3 Operational features
   3.4 Breaking characteristics
4 Classification
5 Characteristics
   5.1 List of characteristics
   5.2 Type of circuit-breaker
   5.3 Rated values and limiting values for the main
        circuit
        5.3.1 General
        5.3.2 Rated voltages
        5.3.3 Rated currents
        5.3.4 Rated time constants
        5.3.5 Short-circuit characteristics (see also
               annex B)
   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 Peak arc 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
        8.2.1 Operating conditions
        8.2.2 Temperature rise
        8.2.3 Operation following inactivity
        8.2.4 Electromagnetic compatibility (EMC)
        8.2.5 Acoustic noise emission
        8.2.6 Dielectric properties
        8.2.7 Switching overvoltages
        8.2.8 Operational performance capability
        8.2.9 Ability to withstand vibration and shock
        8.2.10 Ability to make and break under short-circuit
               conditions
9 Tests
   9.1 Kinds of tests
        9.1.1 General
        9.1.2 Type tests
        9.1.3 Routine tests
        9.1.4 Investigatory tests
   9.2 Verification of constructional requirements
        9.2.1 General
        9.2.2 Type tests
        9.2.3 Routine tests
   9.3 Type tests for verification of performance
        requirements
        9.3.1 Test sequences
        9.3.2 General test conditions
        9.3.3 Test sequence I: general performance
               characteristics
        9.3.4 Test sequence II: rated short-circuit making
               and breaking capacities
        9.3.5 Test sequence III: capability to withstand
               vibration and shock
        9.3.6 Test sequence IV: searching for critical
               currents
        9.3.7 Test sequence V: climatic conditions
        9.3.8 Test sequence VI: other tests
   9.4 Routine tests for verification of performance
        requirements
        9.4.1 General
        9.4.2 Mechanical operation
        9.4.3 Calibration of releases
        9.4.4 Dielectric withstand
        9.4.5 Air-tightness (for pneumatic circuit-breaker)
Annex A (normative) Test circuit to verify the making and
        breaking capacities
Annex B (informative) Verification of short-circuit making
        and breaking capacities
Figures
Tables

In addition to the general requirements of IEC 60077-2, it gives the rules for circuit-breakers, the main contacts of which are to be connected to d.c. power and/or auxiliary circuits. The nominal voltage of these circuits does not exceed 3 000 V d.c. according to IEC 60850.