BS 88-4(1988) : 1988 AMD 14545

National foreword
Committees responsible
Explanatory note
Clause
1 General
   1.1 Scope
   1.2 Object
2 Definitions
   2.2 General terms
3 Conditions for operation in service
   3.4 Voltage
   3.5 Current
   3.6 Frequency, power factor and time constant
   3.10 Temperature inside an enclosure
5 Characteristics of fuses
   5.1 Summary of characteristics
   5.2 Rated voltage
   5.4 Rated frequency
   5.5 Rated power dissipation of the fuse-link
   5.6 Limits of time-current characteristics
   5.8 Cut-off current and I2t characteristics
   5.9 Arc voltage characteristics
6 Markings
   6.2 Markings on fuse-links
7 Standard conditions for construction
   7.3 Temperature rise and power dissipation of the
         fuse-link
   7.4 Operation
   7.5 Breaking capacity
   7.7 I2t characteristics
   7.14 Arc voltage characteristics
   7.15 Special operating conditions
8 Tests
   8.1 General
   8.3 Verification of the temperature-rise limits and
         power dissipation
   8.4 Verification of operation
   8.5 Verification of the breaking capacity
   8.6 Verification of the cut-off current
         characteristic
   8.7 Verification of the I2t characteristics and
         overcurrent discrimination
Figures
   Z1 Trip indicator fuses
   Z2 Single body fuses
   Z3 Twin body fuses (offset tag fuses)
   Z4 Double body fuses (central tag fuses)
Appendix A Guide for the co-ordination of fuse-links
             with semiconductor devices
Appendix B Survey on information to be supplied by the
             manufacturer in his literature (catalogue)
             for a fuse designed for the protection of
             semiconductor devices
National appendix Z Dimensions of semiconductor fuse-
                      links in common use in the UK

The purpose of the supplementary requirements is to establish the characteristics of semiconductor fuse-links in such a way to allow replacement by other fuse-links having the same characteristics, as long as their dimensions are identical. The supplementary requirements apply to fuse-links to be used in equipment containing semiconductor devices for circuits of 1000 V a.c. rated voltages, or circuits of 1500 V d.c maximum nominal voltages and also, as far as they can be applied, for circuits of higher nominal voltages. Also covers: the characteristics of fuses (including rated values, breaking capacity and power dissipation); the markings on fuses; availability and presentation of technical data and type tests for verification of the characteristics of fuses.