Table of Contents
1 Scope and 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
3.6 Definitions related to insulation co-ordination
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 methods of connection
4.5 According to the instantaneous tripping current
4.6 According to the I[2]t 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
7.5 Pollution degree
8 Requirements for construction and operation
8.1 Mechanical design
8.2 Protection against electric shock
8.3 Dielectric properties and isolating capability
8.4 Temperature-rise
8.4.1 Temperature-rise limits
8.4.2 Ambient air temperature
8.5 Uninterrupted duty
8.6 Automatic operation
8.6.1 Standard time-current zone
8.6.2 Conventional quantities
8.6.3 Tripping characteristic
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 Tests of reliability of screw-type terminals
for external copper conductors
9.6 Test of protection against electric shock
9.7 Test of dielectric properties and isolating
capability
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 Mechanical stresses
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
Annex A (informative) - Determination of short-circuit
power factor
Annex B (normative) - Determination of clearances and
creepage distances
Annex C (normative) - Number of samples to be submitted
and test sequences to be applied for verification
of conformity (13.5 of ISO/IEC Guide 2:1991)
Annex D (informative) - Co-ordination under short-circuit
conditions between a circuit-breaker and another
short-circuit protective device (SCPD) associated
in the same circuit
Annex E (normative) - Special requirements for auxiliary
circuits for safety extra-low voltage
Annex F (informative) - Examples of terminals
Annex G (informative) - Correspondence between ISO and AWG
copper conductors
Annex H (normative) - Arrangement for short-circuit test
Annex I (normative) - Routine tests
Annex J (normative) - Particular requirements for
circuit-breakers with screwless type terminals
for external copper conductors
Annex K (normative) - Particular requirements for
circuit-breakers with flat quick-connect
terminations
Annex L (normative) - Specific requirements for
circuit-breakers with screw-type terminals
for external untreated aluminium conductors
and with aluminium screw-type terminals for
use with copper or with aluminium conductors
Annex ZZ (informative) - Variations to IEC 60898-1 for
application in Australia and New Zealand
Bibliography
Abstract
Proposes the adoption of IEC60898-1:2003 as a revision of AS/NZS4898:1997. Contains essential safety and associated requirements for a.c. air-break circuit-breakers for operation at 50Hz or 60 Hz, having a rated voltage not exceeding 440 V (between phases), a rated current not exceeding 125A and a rated short-circuit capacity not exceeding 25,000 A. Annex ZZ lists variations for Australian and New Zealand conditions.
Scope
This part of IEC 60898 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.
As far as possible, it is in line with the requirements contained in IEC 60947-2.
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.
They are intended for use in an environment with pollution degree 2.
They are suitable for isolation.
Circuit-breakers of this standard, with exception of those rated 120 V or 120/240 V (see table 1), are suitable for use in IT systems provided that the requirements of IEC 60364-4-473:1977 + A1:1998 are complied with.
This standard 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.
This standard does not apply to
circuit-breakers intended to protect motors;
circuit-breakers, the current setting of which is adjustable by means accessible to the user.
For circuit-breakers having a degree of protection higher than IP20 according to IEC 60529, for use in locations where arduous environmental conditions prevail (e.g. excessive humidity, heat or cold or deposition of dust) and in hazardous locations (e.g. where explosions are liable to occur), special constructions may be required.
Requirements for circuit-breakers for a.c. and d.c. operation are given in IEC 60898-2.
Requirements for circuit-breakers which incorporate residual current tripping devices are to be found in IEC 61009-1, IEC 61009-2-1, and IEC 61009-2-2.
A guide for co-ordination under short-circuit conditions between a circuit-breaker and another short-circuit protective device (SCPDs) is given in annex D.
NOTE 1 For more severe overvoltage conditions, circuit-breakers complying with other standards (e.g. IEC 60947-2) should be used.
NOTE 2 For an environment with a higher pollution degree, enclosures giving the appropriate degree of protection should be used.
NOTE 3 Circuit-breakers within the scope of this standard may also be used for protection against electric shock in case of fault, depending on their tripping characteristics and on the characteristics of the installation. The criterion of application for such purposes is dealt with by installation rules.
This standard contains all requirements necessary to ensure compliance with the operational characteristics required for these devices by type tests.
It also contains the details relative to test requirements and methods of testing necessary to ensure reproducibility of test results.
This standard states a) the characteristics of circuit-breakers; b) the conditions with which circuit-breakers shall comply, with reference to: 1) their operation and behaviour in normal service; 2) their operation and behaviour in case of overload;
3) their operation and behaviour in case of short-circuits up to their rated short-circuit capacity;
4) their dielectric properties;
c) the tests intended for confirming that these conditions have been met and the methods to be adopted for the tests;
d) the data to be marked on the devices;
e) the test sequences to be carried out and the number of samples to be submitted for certification purposes (see annex C);
f) the co-ordination under short-circuit conditions with another short-circuit protective device (SCPD) associated in the same circuit (see annex D);
g) the routine tests to be carried out on each circuit-breaker to reveal unacceptable variations in material or manufacture, likely to affect safety (see annex I).
History
First published as AS/NZS 4898:1997.
Jointly revised and redesignated as AS/NZS 60898.1:2004.