IEC 60898:1995

Foreword
1. General
    1.1 Scope
    1.2 Object
2. Normative references
3. Definitions
    3.1 Devices
    3.2 General terms
    3.3 Constructional elements
    3.4 Conditions of operation
    3.5 Characteristic quantities
4. Classification
    4.1 According to the number of poles
    4.2 According to the protection against external influences
    4.3 According to the method of mounting
    4.4 According to the method of connection
    4.5 According to the instantaneous tripping current
    4.6 According to the I2t characteristic
5. Characteristics of circuit-breakers
    5.1 List of characteristics
    5.2 Rated quantities
    5.3 Standard and preferred values
6. Marking and other product information
7. Standard conditions for operation in service
    7.1 Ambient air temperature range
    7.2 Altitude
    7.3 Atmospheric conditions
    7.4 Conditions of installation
8. Requirements for construction and operation
    8.1 Mechanical design
    8.2 Protection against electric shock
    8.3 Dielectric properties
    8.4 Temperature-rise
    8.5 Uninterrupted duty
    8.6 Automatic operation
    8.7 Mechanical and electrical endurance
    8.8 Performance at short-circuit currents
    8.9 Resistance to mechanical shock and impact
    8.10 Resistance to heat
    8.11 Resistance to abnormal heat and to fire
    8.12 Resistance to rusting
9. Tests
    9.1 Type tests and test sequences
    9.2 Test conditions
    9.3 Test of indelibility of marking
    9.4 Test of reliability of screws, current-carrying parts
         and connections
    9.5 Test of reliability of terminals for external conductors
    9.6 Test of protection against electric shock
    9.7 Test of dielectric properties
    9.8 Test of temperature rise and measurement of power loss
    9.9 28-day test
    9.10 Test of tripping characteristic
    9.11 Test of mechanical and electrical endurance
    9.12 Short-circuit tests
    9.13 Test of resistance to mechanical shock and impact
    9.14 Test of resistance to heat
    9.15 Resistance to abnormal heat and to fire (glow-wire test)
    9.16 Test of resistance to rusting
Tables
1 Preferred values of rated voltage
2 Ranges of instantaneous tripping
3 Clearances and creepage distances
4 Connectable cross-sections of copper conductors for screw-type
    terminals
5 Temperature-rise values
6 Time-current operating characteristics
7 List of type tests
8 Cross-sectional areas (S) of test copper conductors
    corresponding to the rated currents
9 Screw thread diameters and applied torques
10 Pulling forces
11 Conductor dimensions
12 Maximum power loss per pole
13 List of short-circuit-tests
14 Power factor ranges of the test circuit
15 Ratio k between service short-circuit capacity (Ics) and rated
    short-circuit capacity (Icn)
16 Test procedure for Ics in the case of single- and two-pole
    circuit breakers
17 Test procedure for Ics in the case of three- and four-pole
    circuit-breakers
18 Test procedure for Ics in the case of three-phase test for
    single-pole circuit-breakers of rated voltage 230/400 V
19 The test procedure for Icn
20 Test procedure for Icn the case of three-phase tests for single-
    and two-pole circuit breakers of rated voltage 230/400 V
Figures
Annexes
A Determination of short-circuit power factor
B Determination of clearances and creepage distances
C Number of samples to be submitted and test sequences to be
    applied for verification of conformity
D Coordination of circuit-breakers with separate fuses associated
    in the same circuit
E Special requirements for auxiliary circuits for safety extra-low
    voltage
F Examples of terminals
G Correspondence between ISO and AWG copper conductors
H Arrangements for short-circuit tests

Applies to a.c. air-break circuit-breakers for operation at 50 Hz or 60 Hz, having a rated voltage not exceeding 440 V (between phases), a rated current not exceeding 125 A and a rated short-circuit capacity not exceeding 25 000 A.These circuit-breakers are intended for the protection against overcurrents of wiring installations of buildings and similar applications; they are designed for use by uninstructed people and for not being maintained.Also applies to circuit-breakers having more than one rated current, provided that the means for changing from one discrete rating to another is not accessible in normal service and that the rating cannot be changed without the use of a tool.