NEMA FU 1-2012 Low Voltage Cartridge Fuses.pdf
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1、NEMA Standards PublicationNational Electrical Manufacturers AssociationNEMA FU 1-2012Low Voltage Cartridge FusesNEMA FU 1-2012 Low Voltage Cartridge Fuses Published by National Electrical Manufacturers Association 1300 North 17th Street, Suite 900 Rosslyn, Virginia 22209 www.nema.org 2013 National E
2、lectrical Manufacturers Association. All rights, including translation into other languages, reserved under the Universal Copyright Convention, the Berne Convention for the Protection of Literary and Artistic Works, and the International and Pan American copyright conventions. FU 1-2012 Page ii 2013
3、 National Electrical Manufacturers Association NOTICE AND DISCLAIMER The information in this publication was considered technically sound by a consensus among persons engaged in its development at the time it was approved. Consensus does not necessarily mean there was unanimous agreement among every
4、 person participating in the development process. The National Electrical Manufacturers Association (NEMA) standards and guideline publications, of which the document herein is one, are developed through a voluntary standards development process. This process brings together volunteers and/or seeks
5、out the views of persons who have an interest in the topic covered by this publication. Although NEMA administers the process and establishes rules to promote fairness in the development of consensus, it does not write the documents, nor does it independently test, evaluate, or verify the accuracy o
6、r completeness of any information or the soundness of any judgments contained in its standards and guideline publications. NEMA disclaims liability for any personal injury, property, or other damages of any nature, whether special, indirect, consequential, or compensatory, directly or indirectly res
7、ulting from the publication, use of, application, or reliance on this document. NEMA disclaims and makes no guaranty or warranty, express or implied, as to the accuracy or completeness of any information published herein, and disclaims and makes no warranty that the information in this document will
8、 fulfill any particular purpose(s) or need(s). NEMA does not undertake to guarantee the performance of any individual manufacturers or sellers products or services by virtue of this standard or guide. In publishing and making this document available, NEMA is not undertaking to render professional or
9、 other services for or on behalf of any person or entity, nor is NEMA undertaking to perform any duty owed by any person or entity to someone else. Anyone using this document should rely on his or her own independent judgment or, as appropriate, seek the advice of a competent professional in determi
10、ning the exercise of reasonable care in any given circumstance. Information and other standards on the topic covered by this publication may be available from other sources, which the user may wish to consult for additional views or information not covered by this publication. NEMA has no power, nor
11、 does it undertake to police or enforce compliance with the contents of this document. NEMA does not certify, test, or inspect products, designs, or installations for safety or health purposes. Any certification or other statement of compliance with any health- or safety-related information in this
12、document shall not be attributable to NEMA and is solely the responsibility of the certifier or maker of the statement. FU 1-2012 Page iii 2013 National Electrical Manufacturers Association TABLE OF CONTENTS Page Foreword . v Section 1 GENERAL 1.1 Scope .1 Section 2 DEFINITIONS AND ABBREVIATIONS 2.1
13、 Definitions .2 Section 3 SERVICE CONDITIONS 3.1 Usual Service Conditions 4 3.2 Unusual Service Conditions .4 Section 4 RATINGS 4.1 Current Ratings of Non Time-Delay Fuses 5 4.2 Current Ratings of Time-Delay Fuses .6 4.3 AC Voltage Ratings 6 4.4 DC Voltage Ratings 7 4.5 AC Interrupting Ratings .7 4.
14、6 DC Interrupting Ratings .7 4.7 Frequency Rating .7 Section 5 FUSE CLASSES 5.1 Summary of Fuse Classes 8 5.2 Class G Fuses (Current Limiting) 0-60 Amperes, 480 V and 600 V Alternating Current .8 5.3 Class H Fuses 0-600 Amperes, 250 V and 600 V Alternating Current8 5.4 Class J Fuses (Current Limitin
15、g) 0-600 Amperes, 600 V, Alternating Current .8 5.5 Class K Fuses 0-600 Amperes, 250 V and 600 V, Alternating Current.8 5.6 Class L Fuses (Current Limiting) 601-6000 Amperes, 600 V, Alternating Current 8 5.7 Class R Fuses (Current Limiting) 0-600 Amperes, 250 V and 600 V, Alternating Current .8 5.8
16、Class T Fuses (Current Limiting) 0-1200 Amperes, 300 V and 600 V, Alternating Current9 5.9 Class CC Fuses (Current Limiting) 0-30 Amperes, 600 Volts, Alternating Current .9 5.10 Fuses for Photovoltaic Systems (Current Limiting) PV fuses 9 Section 6 PERFORMANCE 6.1 General . 22 6.2 Current Carrying C
17、apacity and Temperature Rise Tests . 22 6.3 Overload Opening Time . 25 6.4 Interrupting Tests at Rated Voltage 25 6.4.1 Overload Tests .27 6.4.2 10,000 Amperes Short Circuit Tests 27 FU 1-2012 Page iv 2013 National Electrical Manufacturers Association 6.4.3 Interrupting Rating and Intermediate Inter
18、ruption Level Tests 27 6.5 Maximum Energy . . 35 6.6 Maximium Threshold Ratio 35 6.7 Direct Current Tests . 35 6.7.1 Overload Test. 35 6.7.2 Short Circuit Test 35 6.8 Direct Current Tests for Photovoltaic Fuses . 36 6.8.1 Verification of Temperature Rise and Current-Carrying Capacity 36 6.8.2 Verifi
19、cation of Overload Operation .36 6.8.3 Verification of Operation Rated Voltage . 37 6.8.4 Verification of Peak Let-Through Characteristics and 2t .37 6.8.5 Verification of Freedom From Unacceptable Levels of Thermally Induced Drift .37 6.8.6 Verification of Functionality at Temperature Extremes 37 6
20、.8.7 Current Cycling-Temperature. 37 6.8.8 Current Cycling-Humidity 38 FU 1-2012 Page v 2013 National Electrical Manufacturers Association Foreword These standards have been developed by the Low Voltage Fuse Section of NEMA. The purpose of this standards publication is to assist in the proper select
21、ion and application of the different classes of low voltage cartridge fuses. User needs have been considered throughout the development of these standards. NEMA standards publications are subject to periodic review. They are revised frequently to meet changing conditions and technical progress. The
22、user should secure the latest editions. Proposed or recommended revisions should be submitted to: Senior Technical Director, Operations National Electrical Manufacturers Association 1300 North 17th Street, Suite 900 Rosslyn, VA 22209 This standards publication was developed by the Fuse Section. Sect
23、ion approval of the standard does not necessarily imply that all section members voted for its approval or participated in its development. At the time it was approved, the group/section was composed of the following members: Cooper Bussmann St. Louis, MO Ferraz Shawmut Newburyport, MA Littelfuse De
24、sPlaines, IL Eagle Long Island, NY FU 1-2012 Page 1 2013 National Electrical Manufacturers Association Section 1 GENERAL 1.1 SCOPE This standards publication covers the following fuses: a. Class G, H, J, K, L, R, T, and CC low voltage cartridge fuses rated 600 volts or less, alternating current and
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