DIN EN 60077-3 : 2003

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
   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
Annex ZA (normative) Normative references to international
         publications with their corresponding European
         publications

Provides 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 3000 V d.c. according to IEC 60850.