1、_SAE Technical Standards Board Rules provide that: “This report is published by SAE to advance the state of technical and engineering sciences. The use of this report is entirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising theref
2、rom, is the sole responsibility of the user.” SAE reviews each technical report at least every five years at which time it may be revised, reaffirmed, stabilized, or cancelled. SAE invites your written comments and suggestions.Copyright 2012 SAE International All rights reserved. No part of this pub
3、lication may be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of SAE. TO PLACE A DOCUMENT ORDER: Tel: 877-606-7323 (inside USA and Canada) Tel: +1 724-776-4970
4、(outside USA) Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.orgSAE values your input. To provide feedback on this Technical Report, please visit http:/www.sae.org/technical/standards/AS6019AEROSPACESTANDARDAS6019 Issued 2012-06 ARC Fault Circuit Breaker (AFCB), Aircr
5、aft, Trip-Free 28 VDC RATIONALEThis specification has been developed to provide a means of compliance for qualification of 28 VDC arc fault circuit breakers or alternate product solutions. FOREWORDThermal circuit breakers are designed to react to the heating effect of current carried by wire; and to
6、 protect the wire insulation from thermal damage. These protective devices are not designed to detect or react to the short duration of arcing faults that typically occur outside (before approaching) the defined trip region, or Time versus Current curve, of the thermal circuit breakers.In addition,
7、arc impedance can reduce low voltage fault current magnitudes appreciably. AFCBs combine active arc fault detection with thermal overload protection into one package. Supplemented with the arc fault detection, the AFCB provides an equivalent level of thermal protection of existing thermal circuit br
8、eakers (typically qualified under AS58091), with the added ability to detect and react to arc fault conditions, thereby mitigating damage that will occur to the wiring system by protracted arcing events. It is important to note that the primary purpose of the AFCB as stated above is to mitigate dama
9、ge to the aircraft wiring from the circuit breaker to the first serial load element (examples: LRU, transformer, ballast, rectifier, or connected equipment, etc.). In doing so, the potential of igniting surrounding materials is reduced, but not eliminated. Use of AFCBs for hazard mitigation/preventi
10、on beyond its intended function of mitigating damage to the aircraft wiring should be carefully analyzed and evaluated. NOTE: AS58091 was used as the base document for this AFCB specification as such the tables comprehend future amp rating expansion from 1 to 100 A. SAE AS6019 Page 2 of 60 1. SCOPE
11、1.1 Scope The primary function of this specification is to cover the general requirements for 28 VDC manual reset trip-free arc fault/thermal circuit breakers for use in aircraft electrical systems conforming to MIL-STD-704. As a secondary function, this specification may possibly cover the general
12、requirements for AFCBs for use in primary vehicles, other than aircraft, when mounted directly to the structure. 1.2 Classification AFCBs shall be the Thermal Type, and classified into different styles. Variations from the basic style of each AFCB shall be indicated by the part number from the appro
13、priate specification sheet (see 3.1). 1.2.1 Styles AFCB styles shall consist of all part numbers covered by one Aerospace Standard or specification sheet. For example: a. All part numbers of AS6019/1 shall be the same style. b. All part numbers of AS6019/2 shall be the same style. The same style cla
14、ssification applies to all Aerospace Standards and specification sheets covered by this specification. 1.2.2 Part Number The part numbers for AFCBs in accordance with this specification shall conform to part number scheme below. Alphanumeric characters shall be used to designate variations from the
15、basic style of each circuit breaker. Example of part number scheme: When a designator for a variation is not applicable it shall be omitted from the part number. Not all letters are applicable for every specification sheet. Refer to the latest specification sheet and QPL for available and qualified
16、configurations. 1.2.3 Amperage Ratings The amperage rating designator shall be a number specified in each specification sheet to indicate the nominal amperage rating for overload protection. 1.2.4 Pushbuttons The AFCB pushbutton shall be designated as follows. Standard length pushbutton, as specifie
17、d in the specification sheet shall have no designator letter. L - Extra length pushbutton (see 6.3.9) SAE AS6019 Page 3 of 60 1.2.5 Auxiliary Switch Terminals The use of auxiliary switch terminals when allowed by the specification sheet shall be designated as follows. AFCBs with standard terminals o
18、nly, as specified in the specification sheet, shall have no designator letter. A - Auxiliary switch terminals 1.2.6 Vibration Level The vibration level of the AFCB shall be specified in the specification sheet and shall be indicated in the part number by one or more of the following designators. Sta
19、ndard sine vibration capabilities shall have no designator (see 4.7.11.2). V - High Level sine capabilities (see 4.7.11.3). C thru K - Random vibration capabilities (see 4.7.11.1). 1.2.7 Mounting Configurations Unless otherwise specified, the AFCB mounting configuration shall be designated as follow
20、s. Standard bushing mounted circuit breakers shall have no designator. P - Cover-plate mount. 2. APPLICABLE DOCUMENTS The present revision of these documents is applicable unless otherwise specified by contract. 2.1 Government Specifications, Standards, and Handbooks 2.1.1 The following specificatio
21、ns, standards, and handbooks form a part of this specification to the extent specified herein.MIL-I-24768/17 Insulation, Plastic, Laminated, Thermosetting, Glass-Cloth, Silicone-Resin (GSG) MIL-DTL-81381 Wire, Electric, Polyimide Insulated, Copper or Copper Alloy MIL-HDBK-454 General Guidelines for
22、Electrical Equipment MIL-I-24768/1 Plastic Sheet, Laminated, Thermosetting, Glass cloth Melamine Resin MIL-STD-104 Limit for Electrical Insulation Color MIL-STD-1285 Marking of Electrical and Electronic Parts MIL-STD-1916 DOD Preferred Methods for Acceptance of Product MIL-STD-202 Test Methods for E
23、lectronic and Electrical Component Parts MIL-STD-704 Aircraft Electric Power Characteristics MIL-STD-810 Environmental Engineering Considerations and Laboratory Tests MIL-STD-889 Dissimilar Metals (Copies of specifications, standards, handbooks, drawings and other Government documents required by co
24、ntractors in connection with specific acquisition functions should be obtained from the contracting activity or as directed by the contracting activity.) SAE AS6019 Page 4 of 60 2.2 Other Publications The following document(s) form a part of this specification to the extent specified herein. AMERICA
25、N SOCIETY FOR TESTING AND MATERIALS (ASTM) ASTM D635 Standard Test Method for Rate of Burning and/or Extent and Time of Burning of Plastics in a Horizontal PositionASTM D5948 Molding Compounds, Thermosetting (Copies available from Available from ASTM International, 100 Barr Harbor Drive, P.O. Box C7
26、00, West Conshohocken, PA 19428-2959, Tel: 610-832-9585, www.astm.org.)SOCIETY OF AUTOMOTIVE ENGINEERS (SAE) AS4373 Test Methods for Insulated Electric Wire ARP4754 Guidelines for Development of Civil Aircraft and Systems ARP4761 Guidelines and Methods for Conducting the Safety Assessment Process on
27、 Civil Airborne Systems and EquipmentAS5692 ARC Fault Circuit Breaker (AFCB), Aircraft, Trip-Free Single Phase and Three Phase 115 VAC, 400 Hz - Constant Frequency AS7928 Terminals, Lug: Splices, Conductor: Crimp Style, Copper, General Specification For AS8879 Screw Threads - UNJ Profile, Inch Contr
28、olled Radius Root with Increased Minor Diameter AS22759 Wire, Electrical, Fluoropolymer-Insulated, Copper or Copper Alloy AS22759/34 Wire, Electrical, Fluoropolymer-Insulated, Cross-Linked Modified ETFE, Normal Weight, Tin-Coated Copper, 150C, 600 Volt AS25036 Terminal, Lug, Crimp Style, Copper, Ins
29、ulated, Ring Tongue, Bell-Mounted, Type II, Class 1 (for 105 C Total Conductor Temperature) AS27212 Terminal Board Assembly, Molded-in-Stud, Electric AS50861 Wire, Electric, Polyvinyl Chloride Insulated, Copper or Copper Alloy AS50881 Wiring Aerospace Vehicle AS58091 Circuit Breakers, Trip-Free, Air
30、craft General Specification For AS81044 Wire, Electrical, Crosslinked Polyalkene, Crosslinked Alkane-Imide Polymer, or Polyarylene Insulated, Copper or Copper Alloy (Copies available from Available from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside U
31、SA and Canada) or 724-776-4970 (outside USA), www.sae.org.)SAE AS6019 Page 5 of 60 OTHERA-A-528080 thru A-A-52084 Tape, Lacing and Tying AIA/NAS NASM 25027 Nut, Self-Locking, 250 deg. F, 450 deg. F, and 800 deg. F ANSI/ASC (Z1.4) Procedure and Tables for Inspection by Attributes ASME-Y.100 Engineeri
32、ng Drawing Practices ISO 10012-1 Calibration Laboratories and Measuring Test Equipment General Requirement ANSI/NCSL Z540-1 Calibration Laboratories and Measuring Test Equipment General Requirement RTCA/DO-160 Environmental Conditions and Test Procedures for Airborne Equipment RTCA/DO-178 Software C
33、onsideration in Airborne Systems and Equipment Certification RTCA/DO-254 Design Assurance Guidance for Electronic Hardware Copies of DOD adopted non-Government Standards are available to Military activities through the DOD Single Stock Point, Standardization Documents Order Desk, Building 4D, 700 Ro
34、bbins Avenue, Philadelphia, PA 19111-5094. (Military activities may obtain copies of non-DoD adopted documents from the sponsoring Industry Association Non-military activities may obtain copies of non-Government standards and publications from the American Society of Quality Control, P.O. Box 3066,
35、Milwaukee, WI 53201-3066 and the American National Standards Institute, 1430 Broadway, New York, NY 10018, as appropriate.) ANSI National Conference of Standard Labs (NCSL), 2995 Wilderness Place, Suite 107, Boulder, CO 80301, Tel: 303-440-3339, www.ncsli.org.RTCA Inc. 1828 L Street, NW, Suite 805,
36、Washington, DC 20036, Tel: 202-833-9339, www.rtca.org.ISO from International Organization for Standardization, 1, rue de Varembe, Case postale 56, CH-1211 Geneva 20, Switzerland, Tel: +41-22-749-01-11, www.iso.org.2.3 Order of Precedence In the event of a conflict between the text of this specificat
37、ion and the references cited herein (except for associated detailed specification sheets, specification sheets or AS standards), the text of this specification shall take precedence. Nothing in this specification, however, shall supersede applicable laws and regulations unless a specific exemption h
38、as been obtained. 3. REQUIREMENTS 3.1 Specification Sheets The individual item requirements shall be as specified herein and in accordance with the applicable specification sheet. In the event of any conflict between the requirements of this specification and the specification sheet, the latter shal
39、l govern.3.2 Qualification The AFCBs furnished under this specification shall be products that are authorized by the Qualifying Activity for Listing on the applicable Qualified Products List (see 4.5 and 6.2). SAE AS6019 Page 6 of 60 3.2.1 First Article Inspection AFCBs furnished under this specific
40、ation not covered by specification sheets shall be subjected to the tests specified in 4.5. 3.3 Materials Suitable materials shall be used that will enable the AFCBs to conform to the performance requirements of this specification. Acceptance or approval of any constituent material shall not be cons
41、trued as a guarantee of the acceptance of the finished product. 3.3.1 Fungus Materials shall be used which are not nutrients for fungus as specified in Guideline 4 of MIL-HDBK-454. 3.3.2 Metal All metals used in the construction of AFCBs shall be corrosion resistant or shall be suitably protected to
42、 resist corrosion. The use of dissimilar metals, especially contacts between brass, copper, steel and aluminum or magnesium alloys, shall be avoided. Where contact between dissimilar metals is unavoidable, the metals shall be protected against electrolytic corrosion. Dissimilar metals are defined in
43、 MIL-STD-889. When thermostatic bimetals and trimetals are used, corrosion resulting from tests specified herein shall not adversely affect the performance of the AFCB. 3.3.3 Plastics Plastic materials used in the housing, insulator base, and any internal parts exposed to arcing or surface creepage
44、shall conform to ASTM D5948 or equivalent and shall not exhibit any deleterious impact on AFCB performance during normal operation or qualification testing. Other types of plastics materials may be used provided the manufacturer submits satisfactory evidence to the activity responsible for qualifica
45、tion.Plastic materials used by the manufacturer must exhibit evidence of satisfactory performance that the materials are suitable for the purpose intended. The plastic materials used shall neither support combustion nor give off noxious gases when subjected to arcs, such as those caused by interrupt
46、ing heavy short circuit currents (as defined on the specification sheet or specification sheet), or explosions of gaseous vapors to which the materials may be subjected in service. Plastic materials with cellulose fillers will not be permitted in parts that may be subjected to arcing or surface cree
47、page. Plastic materials used shall be certified to exhibit a minimum ignition time of 90 s and a maximum extinguishing time of 90 s when tested for flammability in accordance with ASTM D635. 3.3.4 Protective Treatment The use of any protective coating that will crack, chip, or scale will not be perm
48、itted. 3.3.5 Selection of Materials Specifications and standards for all materials, parts and Government certification and approval of processes and equipment, which are not specifically designated herein and which are necessary for the execution of this specification, shall be selected in accordanc
49、e with MIL-STD-970. 3.3.6 Cleaning Prior to Final Assembly The circuit breakers shall be thoroughly cleaned of loose, spattered, or excessive solder, metal chips, and other foreign material. Burrs, sharp edges and resin flash shall be removed. SAE AS6019 Page 7 of 60 3.3.7 Electronic Components Electronic components selected shall be such that the AFCB shall meet performance requirements and product characteristics specified herein.
