IEC 60127-10 pdf download – Miniature fuses — Part 10: User guide for miniature fuses

IEC 60127-10 pdf download – Miniature fuses — Part 10: User guide for miniature fuses

IEC 60127-10 pdf download – Miniature fuses — Part 10: User guide for miniature fuses
1 Scope
This part of lEC 60127 relates to miniature fuses for the protection of electric appliances,electronic equipment and component parts thereof, normally intended to be used indoors,asspecified in iEc 60127-2,60127-3 and 60127-4.
This standard does not apply to fuses for appliances intended to be used under specialconditions,such as in a corrosive or explosive atmosphere.
lt relates to fuse-holders for miniature fuse-links according to lEC 60127-6.
The object of this guide is to introduce the user to the important properties of miniature fuse-links and fuse-holders for miniature fuses-links and to give some guidance on applying them.NOTE1 lf the performance of lEC 60127 fuses proves inadequate,refer to lEC 60269.
NOTE 2 Fuse-links of the same type and rating may, due to differences in design, have different voltage dropsand different behaviours. Therefore, in practice, they may not be interchangeable when used in applications withlow-circuit voltages, especially in combination with fuse-links of lower rated currents.
NOTE 3Contact the manufacturer for further information.
2Normative references
The following normative documents contain provisions which, through reference in this text,constitute provisions of this part of lEC 60127.For dated references,subsequent amend-ments to, or revisions of,any of these publications do not apply. However,parties toagreements based on this part of lEC 60127 are encouraged to investigate the possibility ofapplying the most recent editions of the normative documents indicated below. For undatedreferences, the latest edition of the normative document referred to applies. Members of lECand lso maintain registers of currently valid International Standards.
lEC 60127-2:1989,Miniature fuses – Part 2: Cartridge fuse-links
lEC 60127-3:1988,Miniature fuses – Part 3: Sub-miniature fuse-links
IEC 60127-4:1996,Miniatures fuses – Part 4: Universal Modular Fuse-links (UMF)
IEC 60127-6:1994,Miniature fuses – Part 6: Fuse-holders for miniature cartridge fuse-linksIEC 60269(all parts),Low-voltage fuses
3 Properties of miniature fuses The miniature fuse provides protection against the effects of short circuits and sustained overloads, protecting components and conductors upstream of the fault and isolating the faulty branch of the circuit downstream of the fault. The opening of the fuse-link also acts as a diagnostic tool, helping to identify the location of the fault. These properties include:
Wide range of physical types of construction: miniature fuses are available in a wide choice of physical constructions. For example, there are fuse-links that can be fitted into clips and fuse-holders or plugged into sockets enabling easy replacement. There are also types which can be soldered on to printed wiring boards by through-hole mounting or surface mounting, using wave soldering or reflow soldering.
Low cost and very small dimensions: miniature fuses provide very good circuit protection in a small package suitable for miniaturized equipment. ? Wide range of characteristics: miniature fuses are generally used within electronic equipment, where prospective short-circuit currents are below 1 500 A. Fuses are available with a very wide range of characteristics, from (very) quick acting types to (long) time-lag types. The latter types are very useful because they can withstand inrush currents experienced during switching on, but will also open under sustained overloads. ? Discrimination (selectivity): standardized fuse characteristics and limitation of let- through energy ensure that a faulty circuit is isolated by the fuse without opening higher rated upstream fuses, avoiding disconnection of the supply to healthy circuits downstream.
Reliability: miniature fuses carry operational currents continuously without any substantial change or deterioration in their characteristics, and give equal protection to that provided by a new fuse. During their long life, no maintenance is required.
Tamper-proof reproducible characteristics: miniature fuses provide a package of protection tailor-made for the application. The same level of protection is then maintained by a replacement fuse-link of the same type and rating, fitted after the fault has been corrected. The extensive schedule of tests in the IEC 601 27 series together with a quality system such as that described in IEC 601 27-5 and a follow-up service by a National Certification Body, ensure that all aspects of fuse operation are accurately and safely reproduced at any location world-wide.
Arc dissipation: suitable fuses can disconnect faults so quickly that there is no time for an arc to become established at the fault location.