1、DRAFT FOR DEVELOPMENT DD183:1989 IEC127-4 TTD Specification for universal modular fusesDD183:1989 This Draft for Development, having been prepared under thedirection of the Power Electrical Engineering StandardsPolicy Committee, waspublished under the authorityof the Board of BSI andcomes into effec
2、t on 31 December1989 BSI02-2000 The following BSI references relate to the work on this Draft for Development: Committee reference PEL/78 ISBN 0 580 17976 1 Committees responsible for this Draft for Development The preparation of this Draft for Development was entrusted by the Power Electrical Engin
3、eering Standards Policy Committee (PEL/-) to Technical Committee PEL/78, upon which the following bodies were represented: Association of Supervisory and Executive Engineers ERA Technology Ltd. Electrical Installation Equipment Manufacturers Association (BEAMA Ltd.) Electrical Power Engineers Associ
4、ation Electricity Supply Industry in England and Wales Engineering Equipment and Materials Users Association London Regional Transport The following bodies were also represented in the drafting of the Draft for Development, through subcommittees and panels: British Telecommunications plc Electrical
5、Contractors Association Electronic Components Industry Federation Institution of Electrical Engineers Ministry of Defence Amendments issued since publication Amd. No. Date of issue CommentsDD183:1989 BSI 02-2000 i Contents Page Committees responsible Inside front cover National foreword ii 1 Gates 1
6、 2 Types of UMF 1 3 Package size Dimensions 1 4 Voltage ratings 1 5 Spacings for temperatures 1 6 Breaking capacity 1 7 Terminations 1 8 Type classification 1 Publications referred to Inside back coverDD183:1989 ii BSI 02-2000 National foreword This Draft for Development has been prepared under the
7、direction of the Power Electrical Engineering Standards Policy Committee. It is identical with IEC127-4 TTD:1989, “Technical Trend Document (TTD) for Universal modular fuses (UMF)”, published by the International Electrotechnical Commission (IEC). It includes the essential elements of future interna
8、tional standardization of a new type of fuselink now being referred to as universal modular fuses (UMF). This publication is not to be regarded as a BritishStandard It is being issued in the Draft for Development series of publications and is of a provisional nature because the subject matter is in
9、the process of development by IEC Technical Committee No.32, Fuses. It should be applied on this provisional basis, so that information and experience of its practical application may be obtained. A review of this Draft for Development will be carried out not later than two years after its publicati
10、on. Notification of the start of the review period, with a request for the submission of comments from users of this Draft for Development, will be made in an announcement in the appropriate issue of BSI News. According to the replies received, the responsible BSI committee will judge whether the Dr
11、aft for Development can be converted into a BritishStandard or what other action should be taken. Cross-reference International Standard Corresponding BritishStandard IEC97:1970 BS5830:1979 Specification for grid system for printed circuits (Identical) Summary of pages This document comprises a fron
12、t cover, an inside front cover, pagesi andii, pages1 and2, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.DD183:1989 BSI 02-2000 1 Characteris
13、tics of UMF 1 Gates A harmonized UMF gate1.25/ n(“non-fusing”) and1.7/ n(“fusing”). This means a fuse-link shall not operate within1h at1.25/ nand shall operate within300s at1.7/ n . 2 Types of UMF For the time being, the following types are covered: a) fuse-links, through hole radial type; b) fuse-
14、links, surface mount type. Fuse-links for use with holders are not covered for the time being. Since the pin spacing of axial type fuse-links is determined by the user, it is impossible to make such fuse-links non-interchangeable. Therefore they have not been included. 3 Package size dimensions Dime
15、nsions will be established on the basis of envelope dimensions. A distinctive marking for UMF will be introduced to avoid confusion with non-UMF types which may fit within the same envelope dimensions. 4 Voltage ratings Standard voltage ratings(r.m.s. values) are: 63V 125V 250V The need for higher a
16、.c. voltages and for d.c. voltages is under consideration. 5 Spacings for terminations The standard spacings are (value for e as specified in IEC Publication97) 1e=63V low breaking capacity (LBC) 2e=125V low breaking capacity (LBC) 3e=250V low breaking capacity (LBC) 4e=250V high breaking capacity (
17、HBC) 6 Breaking capacity Provisionally, the following values are being considered: 7 Terminations The cross-section is not defined, but the cross-sectional area shall be such that the terminations fit within a1mm diameter hole for fuse-links with radial leads. 8 Type classification In addition to th
18、e standard harmonized gate (seeClause1), supplementary overload gates will need to be defined, such as very quick acting (FF), quick acting (F), time-lag (T), and long time-lag (TT). 63V 35A or10/ n (1.0 power factor) 125V 50A or10/ n (1.0 power factor) 250V (LBC) 100 A (1.0 power factor) 250V (HBC)
19、 500A or higher(0.7 to0.8 power factor)2 blankDD183:1989 BSI 02-2000 Publications referred to Seenational foreword.DD183:1989 IEC127-4 TTD BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing BritishStandards. It prese
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