AS/NZS 60269.1:2000

1 - AS/NZS 60269.1:2000 LOW-VOLTAGE FUSES - GENERAL REQUIREMENTS
4 - PREFACE
6 - CONTENTS
9 - 1 General
9 - 1.1 Scope and object
10 - 1.2 Normative references
11 - 2 Definitions
11 - 2.1 Fuses and their component parts
11 - 2.1.1 fuse
12 - 2.1.2 fuse-holder
12 - 2.1.3 fuse-link
12 - 2.1.4 fuse-contact
12 - 2.1.5 fuse-element
12 - 2.1.6 indicating device (indicator)
12 - 2.1.7 striker
12 - 2.1.8 terminal
12 - 2.1.9 dummy fuse-link
12 - 2.1.10 test rig
12 - 2.1.11 gauge-piece
13 - 2.2 General terms
13 - 2.2.1 enclosed fuse-link
13 - 2.2.2 current-limiting fuse-link
13 - 2.2.3 "g" fuse-link
13 - 2.2.4 "a" fuse-link
13 - 2.2.5 temperatures
13 - 2.2.6 overcurrent discrimination
14 - 2.2.7 fuse-system
14 - 2.2.8 size
14 - 2.2.9 homogeneous series of fuse-links
14 - 2.2.10 utilization category
14 - 2.2.11 fuses for use by authorized persons
14 - 2.2.12 fuses for use by unskilled persons
14 - 2.2.13 non-interchangeability
14 - 2.3 Characteristic quantities
14 - 2.3.1 rating
15 - 2.3.2 prospective current of a circuit
15 - 2.3.3 gate
15 - 2.3.4 breaking capacity of a fuse-link
15 - 2.3.5 breaking range
15 - 2.3.6 cut-off current
15 - 2.3.7 cut-off current characteristic
15 - 2.3.8 peak withstand current
15 - 2.3.9 pre-arcing time
15 - 2.3.10 arcing time
16 - 2.3.11 operating time
16 - 2.3.12 I2t (Joule integral)
16 - 2.3.13 I2t characteristic
16 - 2.3.14 I2t zone
16 - 2.3.15 rated current of a fuse-link
16 - 2.3.16 time-current characteristic
16 - 2.3.17 time-current zone
16 - 2.3.18 conventional non-fusing current
16 - 2.3.19 conventional fusing current
17 - 2.3.20 overload curve of an "a" fuse-link
17 - 2.3.21 power dissipation of a fuse-link
17 - 2.3.22 power acceptance of a fuse-holder
17 - 2.3.23 recovery voltage
17 - 2.3.24 arc voltage
17 - 3 Conditions for operation in service
17 - 3.1 Ambient air temperature
18 - 3.2 Altitude
18 - 3.3 Atmospheric conditions
18 - 3.4 Voltage
18 - 3.5 Current
18 - 3.6 Frequency, power factor and time constant
18 - 3.6.1 Frequency
18 - 3.6.2 Power factor
18 - 3.6.3 Time constant
18 - 3.7 Conditions of installation
19 - 3.8 Utilization category
19 - 3.9 Discrimination of fuse-links
19 - 4 Classification
19 - 5 Characteristics of fuses
19 - 5.1 Summary of characteristics
19 - 5.1.1 Fuse-holders
19 - 5.1.2 Fuse-links
19 - 5.1.3 Complete fuses
20 - 5.2 Rated voltage
20 - 5.3 Rated current
20 - 5.3.1 Rated current of the fuse-link
20 - 5.3.2 Rated current of the fuse-holder
20 - 5.4 Rated frequency
20 - 5.5 Rated power dissipation of a fuse-link and rated power acceptance of a fuse-holder
21 - 5.6 Limits of time-current characteristics
21 - 5.6.1 Time-current characteristics, time-current zones
21 - 5.6.2 Conventional times and currents
22 - 5.6.3 Gates
23 - 5.7 Breaking range and breaking capacity
23 - 5.7.1 Breaking range and utilization category
23 - 5.7.2 Rated breaking capacity
23 - 5.8 Cut-off current and I2t characteristics
23 - 5.8.1 Cut-off current characteristics
24 - 5.8.2 I2t characteristics
24 - 6 Markings
24 - 6.1 Markings of fuse-holders
24 - 6.2 Markings of fuse-links
25 - 6.3 Marking symbols
25 - 7 Standard conditions for construction
25 - 7.1 Mechanical design
25 - 7.1.1 Replacement of fuse-links
25 - 7.1.2 Connections, including terminals
25 - 7.1.3 Fuse-contacts
26 - 7.2 Insulating properties
26 - 7.3 Temperature rise, power dissipation of the fuse- link and power acceptance of the fuse-holder
27 - 7.4 Operation
28 - 7.5 Breaking capacity
29 - 7.6 Cut-off current characteristic
29 - 7.7 I2t characterstics
29 - 7.8 Overcurrent discrimination of fuse-links
30 - 7.9 Protection against electric shock
30 - 7.10 Resistance to heat
30 - 7.11 Mechanical strength
30 - 7.12 Resistance to corrosion
30 - 7.12.1 Resistance to rusting
30 - 7.12.2 Resistance to season cracking
30 - 7.13 Resistance to abnormal heat and fire
30 - 7.14 Electromagnetic compatibility
31 - 8 Tests
31 - 8.1 General
31 - 8.1.1 Kind of tests
31 - 8.1.2 Ambient air temperature
31 - 8.1.3 Condition of the fuse
31 - 8.1.4 Arrangement of the fuse and dimensions
32 - 8.1.5 Testing of fuse-links
35 - 8.1.6 Testing of fuse-holders
36 - 8.2 Verification of the insulating properties
36 - 8.2.1 Arrangement of the fuse-holder
36 - 8.2.2 Points of application of the test voltage
36 - 8.2.3 Value of test voltage
37 - 8.2.4 Test method
37 - 8.2.5 Acceptability of test results
37 - 8.3 Verification of temperature rise and power dissipation
37 - 8.3.1 Arrangement of the fuse
38 - 8.3.2 Measurement of the temperature rise
38 - 8.3.3 Measurement of the power dissipation of the fuse-link
38 - 8.3.4 Test method
39 - 8.3.5 Acceptability of test results
40 - 8.4 Verification of operation
40 - 8.4.1 Arrangement of the fuse
40 - 8.4.2 Ambient air temperature
40 - 8.4.3 Test method and acceptability of test results
43 - 8.5 Verification of the breaking capacity
43 - 8.5.1 Arrangement of the fuse
43 - 8.5.2 Characteristics of the test circuit
44 - 8.5.3 Measuring instruments
44 - 8.5.4 Calibration of test circuit
46 - 8.5.5 Test method
48 - 8.5.6 Ambient air temperature
48 - 8.5.7 Interpretation of oscillograms
48 - 8.5.8 Acceptability of test results
49 - 8.6 Verification of the cut-off current characteristics
49 - 8.6.1 Test method
49 - 8.6.2 Acceptability of test results
49 - 8.7 Verification of I2t characteristics and overcurrent discrimination
49 - 8.7.1 Test method
49 - 8.7.2 Acceptability of test results
49 - 8.7.3 Verification of compliance for fuse-links at 0,01 s
49 - 8.7.4 Verification of overcurrent discrimination
50 - 8.8 Verification of the degree of protection of enclosures
50 - 8.9 Verification of resistance to heat
50 - 8.10 Verification of non-deterioration of contacts
50 - 8.10.1 Arrangement of the fuse
50 - 8.10.2 Test method
50 - 8.10.3 Acceptability of test results
50 - 8.11 Mechanical and miscellaneous tests
50 - 8.11.1 Mechanical strength
51 - 8.11.2 Miscellaneous tests
63 - Annex A - Measurement of short-circuit power factor
66 - Annex B - Calculation of pre-arcing I2t values for "gG", "gM", "gD" and "gN" fuse-links
66 - B.1 Evaluation of the pre-arcing I2t value at 0,01 s
66 - B.2 Calculation of the value of pre-arcing I2t under the conditions of test no. 2
67 - Annex C - Calculation of cut-off current-time characteristic
67 - C.1 Preliminary note
68 - C.2 Definition
68 - C.3 Characteristic
68 - C.4 Test condition
68 - C.5 Calculation from the measured values
71 - Annex D - Effect of change of ambient temperature or surroundings on the performance of fuse-links
71 - D.1 Effect of increase of ambient temperature
71 - D.2 Effect of decrease of ambient air temperature
71 - D.3 Effect of installation conditions

Applies to fuses incorporating enclosed current-limiting fuse links with rated breaking capacities of not less than 6 kA, intended for protecting power frequency a.c. circuits of nominal voltages not exceeding 1000 volt or d.c. circuits of nominal voltages not exceeding 1500 V. Also applies to fuse-links intended to be included in fuse-switch combination according to AS 3947.3. This Standard is identical with and has been reproduced from IEC 60269-1:1999.

This standard is applicable to fuses incorporating enclosed current-limiting fuse-links with rated breaking capacities of not less than 6 kA, intended for protecting power-frequency a.c. circuits of nominal voltages not exceeding 1 000 V or d.c. circuits of nominal voltages not exceeding 1 500 V. Subsequent parts of this standard, referred to herein, cover supplementary requirements for such fuses intended for specific conditions of use or applications. Fuse-links intended to be included in fuse-switch combinations according to IEC 60947-3 should also comply with the following requirements. NOTE 1 For "a" fuse-links, details of performance (see 2.2.4) on d.c. circuits should be subject to agreement between user and manufacturer. NOTE 2 Modifications of, and supplements to, this standard required for certain types of fuses for particular applications for example certain fuses for rolling stock, or fuses for high-frequency circuits will be covered, if necessary, by separate standards. NOTE 3 This standard does not apply to miniature fuses, these being covered by IEC 60127. The object of this standard is to establish the characteristics of fuses or parts of fuses (fuse-base, fuse-carrier, fuse-link) in such a way that they can be replaced by other fuses or parts of fuses having the same characteristics provided that they are interchangeable as far as their dimensions are concerned. For this purpose, this standard refers in particular to: the following characteristics of fuses:a) their rated values;b) their insulation;c) heir temperature rise in normal service;d) their power dissipation and acceptance;e) their time/current characteristics;f) their breaking capacity; g) their cut-off current characteristics and their I 2t characteristics. type test for verification of the characteristics of fuses; the marking of fuses.

First published as AS 2005.1-1977.
Second edition 1981.
Revised and redesignated as AS 2005.10-1988.
Jointly revised and redesignated as AS/NZS 60269.1:2000.