1、SAE ARD*50033 91 7943725 0502093 8 The Engineering Society =ior Advancing Mobility -Land Sea Air and Space, INTERNATIONAL 400 Commonwealth Drive, Warrendale, PA i 5096-0001 AEROSPACE RESOURCE DOCUMENT EAE ARD50031 I GENERAL SPECIFICATION FOR 270 Vdc RELAYS 1 .o SCOPE 1.1 ScoDe. This specification es
2、tablishes general requirements for electromechanical relays with contact ratings of 270 Vdc for use in electrical applications. Relays covered by this specification are capable of meeting the electrical and environmental requirements when mounted directly to the structure of aircraft, missile, space
3、craft, ship, and other primary vehicles or in ground support and shipboard equipment as well when used within other subsystems such as electrical load management centers or power controllers. 1.2 Classification. Relays covered by this specification shall be classified by the enclosure design as foll
4、ows: Type 1 - Unsealed Type 2 Environmentally sealed Type 3 Hermetically sealed *NOTE: THIS DOCUMENT IS A NONCONSENSUS DRAFT REPORT MADE AVAILABLE BY AN SAE TECHNICAL COMMITTEE DURING THE PROCESS OF STANDARDS DEVELOPMENT. THE INFORMATION CONTAINED IN THIS REPORT IS BEING DISSEMINATED SOLELY FOR COMM
5、ENT PURPOSE AND SHOULD NOT BE RELIED UPON AT THIS TIME. SAE Technical 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, incl
6、uding any pafent infringement arising therefrom, is the sole responsibility of the user.” Copyright 1991 Society of Automotive Engineers, Inc. All rights reserved. Printed in U.S.A. SAE ARD*50031 91 7943725 0502092 T SAE ARD50031 2.0 2.1 APPLICABLE DOCUMENTS Government specification and standards. U
7、nless otherwise specified, the following specification and standards, of the issue listed in that issue of the Department of Defense Index of Specifications and Standards specified in the solicitation, form a patt of this specification to the extent specified herein. FEDERAL FED-STD-H28 GGG-W-641 QQ
8、-W-343 QQ-S-571 DOD-D-1 O00 DOD-HDBK-263 J-W-1177 ZZ-R-765 MILITARY MlL-STD-143 MIL-STD-202 MIL-STD-454 MI L-STD-704 MIL-STD-706 MIL-STD-790 MIL-STD-883 MIL-STD-839 MIL-STD-1285 MIL-STD-1686 MIL-STD-2000 MS20659 MS25036 MI L-F-15160/2 Screw Thread Standards for Federal Services. Wrench, Socket (and
9、Sockets, Handles, and Attachments for Socket, Wrenches, Hand). Wire, Electrical (Un-insulated) Solder, Tin Alloy: Lead-tin Alloy; and Lead Alloy. Drawings, Engineering and Associated Lists. Electrostatic Discharge Control Handbook for Protection of Electrical and Electronic Parts, Assemblies and Equ
10、ipment (Excluding Electrically Initiated Explosive Devices) Metric. Wire, Magnet, Electrical Rubber, Silicone: Low- and High- Temperature and Tear Resistant. Standards and Specifications, Order of Precedence for the Selection of. Test Methods for Electronic and Electrical Component Parts. Standard G
11、eneral Requirements for Electrical Equipment. Aircraft, Electric Power, Characteristics Power Supply Voltages, Regulated, D.C. within Electronic Equipment. Reliability Assurance Program for Electronic Patts Specifications. Test Methods and Procedures for Microelectronics. Dissimilar Metals Marking o
12、f Electrical and Electronic Parts. Electrostatic Discharge Control Program For Protection of Electrical and Electronic Parts. Standard Requirements For Soldered Electrical Instruments, Power, and Telephone (Nonindicating), Style F02 2 SAE ARD*5003L 91 7943725 O502093 L SAE AR050031 2.2 MIL-F-15160/3
13、 MI L-C-50 1 5 MIL-C-28748 MIL-G-45204 MIL-1-1 O MI L-H-38534 MI L-H-83306 MIL-M-14 MIL-M-38510 MIL-P-116 MIL-P-997 MIL-P-15037 MIL-P-15047 MIL-P-46133 MlL-S-6872 MIL-S-12883 MIL-S-19500 MIL-S-45743 Fuses; Instruments, Power and Telephone (Non-indicating), style F03 Connector, Electrical, Circular T
14、hreaded, AN Type. Connectors, Electrical, Rectangular, Rack and Panel, Sdder Type and Crimp Type Contacts. Gold Plating, Electrodeposited. Insulating Materials, Electrical, Ceramic, Class L. Hybrid Microcitcuits, General Specfication For Hydraulic Fluid, Fire Resistance, Phosphate Ester Base, Aircra
15、ft. Molding Plastics and Molded Plastic Parts, Thermosetting. Microcircuit, General Specification for. Presetvation-Packaging, Method of. Plastic Material, Laminated, Thermosetting, Electrical Insulation: Sheets, Glass, Cloth, Silicone Resin. Plastic Sheet, Laminated Thermosetting, Glass-Cloth Melam
16、ine-Resin. Plastic Material, Laminated Thermosetting, Nylon Fabric Base, Phenolic-Resin. Plastic Molding and Extrusion Material, Poly (Aryi Sulfone Ether) Resin, Thermoplastic. Soldering Process, General Specification for. Sockets and Accessories For Plug-In Electronic Components. Semiconductor Devi
17、ces, General Specifications for. Soldering, Manual Type, High Reliability, Poly (Aryl Sulfone Ether) Resin, Thermoplastic. Other documents, drawinas, and publications. The following documents, drawings, and publications form a part of this specification. AMERICAN NATIONAL STANDARDS INSTITUTE (ANSI)
18、* ANSI Y32.2 Graphic symbols for Electrical and Electronic * ANSIC83. 6 EIA/NACM Standard definitions and terminology Letter symbols for units used in science and * ANSI/IEEE STD 100-1 977 IEEE Standard Dictionaty of Electrical and * D470-59T Methods of Testing Rubber and Thermoplastic Diagrams. for
19、 Relays for Electronic Equipment. * ANSIY10. 9 technology. Electronic term. Insulated Wire and Cableventative) SAE ARD*5003L 91 7943725 0502094 3 SAE ARD50031 3.0 3.1 3.2 3.3 3.3.1 3.3.1.1 3.3.2 3.3.2.1. (Copies of ANSI publications may be obtained from the American National Standards Institute 11 W
20、est 42nd Street, New York, NY 10036). REQUIREMENTS Suecification sheets. The individual item requirements shall be as specified herein and in accordance with the applicable specification sheets. In the event of any conflict between requirements of this specification and the applicable specification
21、sheets, the later shall govern. (See attachments, Figure 9) Qualification. The relays furnished under this specification shall be a product which has been tested, and has passed the qualification inspection specified herein. Materials. The materials shall conform to requirements specified herein. Wh
22、en a definite material is not specified, the selection of material shall be at the discretion of the relay manufacturer. Wherever practicable, the manufacturer shall select materials, standards and specifications in accordance with MIL-STD-143. Materials selected shall be such that the relays will m
23、eet the performance requirements and product characteristics Specified herein. After qualification, any change of parts or materials shall be submitted to the procuring activity for approval. Acceptance or approval of any constituent part or material shall not be construed as a guaranty of acceptanc
24、e of the finished product. Metals. Metals shall be of a corrosion-resistant type or shall be plated or treated to resist corrosion. Zinc plating, or unfused pure tin plating shall not be used internally, zinc or cadmium plating shall not be used externally. Unfused tin plating shall have a plating t
25、hickness of 200 microinches minimum if used for external parts. Cadmium plating may be used on removeable mounting and installation hardware. Dissimilar metals. Unless otherwise specified (see 3.1), the use of dissimilar metals shall be as specified in MlL-STD-889. Nonmetals. Nonmetals, including pr
26、otective finishes shall be moisture resistant, nontoxic, arc resistant, flame resistant, and self extinguishing, shall not support fungus growth, and shall not be adversely affected by weathering in aircraft, missile, and spacecraft fluids at the temperatures specified (see 3.1). The manufacturer sh
27、all submit certification to the procuring activity that materials will not support fungus growth. Materials in hermetically sealed envelopes are not required to meet the moisture and fungus resistance requirements. Plastic material. Except as specified herein, plastic material shall conform to MIL-M
28、-14 and MIL-P- 46133 for molded material, MIL-P-997, MIL-P-15037, and MIL-P-15047 for laminated material. Other types of plastic materials possessing superior characteristics may be used, provided the manufacturer submits acceptable evidence to the activity responsible for qualification that such ma
29、terial meets the performance requirements of MIL-M-14, MIL-P-997, MIL-P-15037, MIL-P-15047, or MIL-P-46133, whichever is applicable. In addition to these specifications and the requirements of 3.3.2, the plastic material shall not support combustion, give off noxious gases in harmful quantities, giv
30、e off any gases in quantities sufficient to cause explosion of sealed housing, give off 4 SAE ARD*S0031 91 7943725 O502035 5 SAE ARD50031 3.3.2.2 3.3.2.3 3.3.2.4 3.4 3.4.1 3.4.1.1 3.4.2 3.4.3 3.4.4 any gases in a sealed housing that will cause contamination of the contacts or other parts of the comp
31、onent, or form current-carrying tracks when subjected to arcing conditions encountered when any of the tests In this specification are performed. Ceramic. Ceramic insulating material shall conform to grade L311 (or better) of MIL-1-10. All external ceramic surfaces shall be glazed in accordance with
32、 MlL-1-10, Maanet wire. Magnet wire shall conform to J-W-1177 except when wire not covered by J-W-1177 is required due to physical size or temperature range considerations; then a suitable wire may be substituted, as evidenced by meeting the performance requirements of this specification. Rubber. Ru
33、bber shall conform to ZZ-R-765. Desian and construction. The relays shall be of compact design and of sufficiently rugged construction to withstand all stresses and operational conditions as specified herein. Relay parts shall be secured to the relay assembly by mechanical means, except that attachm
34、ent may be secured by welding, solder, or other fusible materials with melting points above 260C,or 100C above the maximum temperature of the class of relay in question, whichever is more severe. Relays shall be designed for operation in aircraft, missile, and spacecraft and shipboard electrical sys
35、tems, and associated ground support equipment as specified in MIL-STD-704 and MIL-STD- 706. Enclosures of hermetically sealed relays shall be securely attached to the relay structure by rolling, crimping, welding, or other suitable means prior to the application of any solder. Selection of militarv
36、specification and standards. Specifications and standards for all parts, materials, and procuring activity 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 accorda
37、nce with MIL-STD-143, as applicable, except as provided in the following paragraph. Standard parts. Standard mounting and terminal hardware (.e. screws, lockwashers, etc) (MS and AN) shall be used wherever practicable. Nonstandard equivalents may be used, provided they possess suitable properties an
38、d are replaceable by the standard parts (MS and AN) without alteration. Attitude. The relay shall be constructed to insure proper operation when mounted in any position. Mountina brackets. When brackets are used, they shall be an integral part of the relay housing or shall be securely attached there
39、to in a manner to prevent any movement between the relay and the mounting bracket in service use. Mechanical failure (fail-safe) features. Construction shall be such that failure of any part of the linking between the actuator and movable contacts will result in action to move the movable contacts t
40、o the de-energized position. In the case of a latched relay, contacts will remain in the position they were in at the time of the failure. 5 SAE ARD*5003L 91 7943725 0502096 7 m SAE ARD50031 3.4.5 3.4.5.1 3.4.5.2 3.4.5.3 3.4.5.4 3.4.6 3.4.7 3.4.8 Enclosures. Enclosures shall be of sufficient mechani
41、cal strength to withstand the normal abuse incurred in handling, transit, storage, and installation without causing malfunction or distortion of parts. The case shall not be part of the contact or coil electrical circuits, but it may be part of the magnetic circuit. Unsealed enclosure. Unsealed rela
42、ys shall be totally enclosed for mechanical and dust protection and shall be explosion-proof (see 3.31). The enclosure shall be so designed that when the cover is removed, the relay shall be capable of operating without adjustment. The enclosure design shall be such that pressure differentials canno
43、t exist between the Inside and outside to aggravate the moisture accumulation problem. The cover shall be rugged in design, constructed of high impact materials, and securely mounted to the relay. Metal covers shall be provided with a means for grounding as specified. Hermeticallv sealed enclosure.
44、Hermetically sealed enclosures shall be constructed as a gas-tight enclosure which has been completely sealed by fusion of glass or ceramic to metal or bonding of metal to metal. Hermetically sealed relays, other than vacuum relays, shall be purged of all air and filled with a suitable inert gas of
45、such characteristic that the leakage rate may be determined by conventional means. Except for solder sealed types, relays of a sealed gas construction of less than 2 cubic inches of external volume shall be sealed within a chamber containing a backfill gas. Solder sealed relays and relays greater th
46、an 2 cubic inches of external volume must be sealed within 60 seconds maximum after filling. The fill gas shall have a dew point of at least 5OC colder than the low temperature specified. The relays shall be filled to a pressure of 15 +/- 1 pounds per square inch absolute (see 3.37). No adjacent sea
47、lants shall be used on the headers. Envronmentallv sealed fnon-hermetic enclosuresl. Environmentally sealed enclosures shall be constructed by any means other than that defined under hermetically sealed enclosure (see 3.4.5.2) to achieve the degree of seal specified (see 3.1). The mounting shall pro
48、vide an effective electrical contact to ground when the relay is mounted (see requirement 1 of MlL-STD-454) (personnel safety). Threaded parts. Ail threaded parts shall be in accordance with FED-STD-H28. Where practical, all threads shall be in conformity with the coarse thread series. The fine thre
49、ad series shall be used only for applications that might show a definite advantage through their use. Where a special diameter-pitch combination is required, the thread shall be of American National Form and of any pitch between 16 and 36 which is used in the fine thread series. Installation clearances. Adequate clearance shall be provided for installation of terminals and mounting hardware. Clearance for socket wrenches shall be governed by GGG-W-641. Special installation tools shall not be required. Terminals lelectricl. Relays shall have electric terminals as specified (see 3.1). No
