1、Comments, suggestions or questions on this document should be addressed to DLA Land and Maritime, ATTN: VAT, Post Office Box 3990, Columbus, OH 43218-3990, or emailed to switchdla.mil. Since contact information can change, you may want to verify the currency of this address information using the ASS
2、IST Online database at https:/assist.dla.mil/. AMSC N/A FSC 5930 INCH-POUND MIL-DTL-15291G 29 April 2013 SUPERSEDING MIL-DTL-15291F 6 February 2006 DETAIL SPECIFICATION SWITCHES, ROTARY, SNAP ACTION AND DETENT/SPRING RETURN ACTION, GENERAL SPECIFICATION FOR This specification is approved for use by
3、all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification covers snap-action and detent and spring action rotary switches for use in alternating and direct current applications, with ratings as specified (see 3.1). 1.2 Class. The class designation should be co
4、mposed of a number indicating the current rating followed by the letters SR or SRN, the component designator for rotary switches covered by this specification (see table I). TABLE I. Class designation. Class Maximum current in amperes Maximum V ac Maximum V dc Positioning mechanism 1SR 1SRN 3SR 6SR
5、20SR 10 10 30 60 200 125 125 500 500 500 120 N/A 250 250 250 Snap Detent/spring return Snap Snap Snap 1.2.1 Positioning mechanism. Detent and spring return mechanism, designated by the letter N, should be driven directly from the handle shafts with an increment of handle and blade rotation of 90 deg
6、rees. Omission of the letter N from the class designation should mean that a snap mechanism which should activate from a handle shaft rotation of not greater than 135 degrees is required. Actuation of the snap mechanism should cause the switch blades to rotate 90 degrees to the directed position at
7、a speed independent of the speed at which the handle shaft is turned. After the blades have moved into the directed position and the handle has been released, the handle should reverse its rotation approximately 45 degrees to correspond with the 90-degree switch throw increment. 1.3 Identification.
8、Switches covered by this specification should be identified by a part or identifying number (PIN), (see 3.1 and 6.8). Type designations, where assigned in addition to PINs, are for reference to identifications established in previous issues of this specification (see 3.3 and 6.7). Provided by IHSNot
9、 for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-15291G 2 2. APPLICABLE DOCUMENTS 2.1 General. The documents listed in this section are specified in sections 3, 4 or 5 of this specification. This section does not include documents cited in other sections of thi
10、s specification or recommended for additional information or as examples. While every effort has been made to ensure the completeness of this list, document users are cautioned that they must meet all specified requirements documents cited in sections 3, 4 or 5 of this specification, whether or not
11、they are listed. 2.2 Government documents. 2.2.1 Specifications, standards, and handbooks. The following specifications, standards, and handbooks form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation
12、 or contract. FEDERAL STANDARDS FED-STD-595/26307 - Colors Used in Government Procurement FED-STD-H28 - Screw-Thread Standards for Federal Service DEPARTMENT OF DEFENSE SPECIFICATION MIL-S-901 - Shock Tests, HI(High Impact) Shipboard Machinery, Equipment, and Systems, Requirements for MIL-A-8625 - A
13、nodic Coatings, for Aluminum and Aluminum Alloys STANDARDS MIL-STD-167-1 - Mechanical Vibrations of Shipboard Equipment (Type I - Environmental and Type II - Internally Excited) MIL-STD-202 - Test Methods for Electronic and Electrical Component Parts MIL-STD-1285 - Marking of Electrical and Electron
14、ic Parts (Copies of these documents are available online at https:/assist.dla.mil/quicksearch/ or https:/assist.dla.mil/ or from the Standardization Document Order Desk, 700 Robbins Avenue, Building 4D, Philadelphia, PA 19111-5094.) Provided by IHSNot for ResaleNo reproduction or networking permitte
15、d without license from IHS-,-,-MIL-DTL-15291G 3 2.3 Non-Government publications. The following documents form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract. AMERICAN NATIONAL STANDARDS
16、 INSTITUTE (ANSI) NCSL Z540.3 - Calibration of Measuring and Test Equipment, Requirements for (Copies of these documents are available online at http:/www.ansi.org or from the American National Standards Institute (ANSI), 125 West 43rd Street, New York, NY 10036-8002, telephone 212-642-4900.) AMERIC
17、AN SOCIETY FOR TESTING AND MATERIALS (ASTM) ASTM B 633 - Standard Specification for Zinc On Iron and Steel, Electrodeposited Coatings of (Copies of these documents are available online at http:/www.astm.org or from the American Society for Testing and Materials, 100 Barr Harbor Drive, West Conshohoc
18、ken, Pennsylvania, 19428-2959.) INTERNATIONAL ORGANIZATION FOR STANDARDS (IS0) ISO 10012 - Measurement Management Systems - Requirements for Measurement Processes and Measuring Equipment (Copies of these documents are available online at http:/www.ansi.org or from the American National Standards Ins
19、titute (ANSI), 125 West 43rd Street, New York, NY 10036-8002, telephone 212-642-4900.) SOCIETY OF AUTOMOTIVE ENGINEERS SAE-AMS-QQ-N-290 - Nickel Plating (Electrodeposited) (Copies of these documents are available online at http:/www.sae.org or from Society of Automotive Engineers, 400 Commonwealth D
20、rive, Warrendale, Pennsylvania, 15096-0001) 2.4 Order of precedence. In the event of a conflict between the text of this document and the references cited herein (except for related specification sheets), the text of this document takes precedence. Nothing in this document, however, supersedes appli
21、cable laws and regulations unless a specific exemption has 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 s
22、pecification and the specification sheet, the latter shall govern. 3.2 Qualification. Switches furnished under this specification shall be products which are authorized by the qualifying activity for listing on the applicable qualified products list at the time of award of contract (see 4.4 and 6.6)
23、. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-15291G 4 3.3 Switch types. Switches furnished under this specification shall be as specified in 3.3.1 and 3.3.2. 3.3.1 Switches covered by specification sheet and identified by PINs. Switches
24、which are completely defined by a military specification sheet (see 3.1) shall be as specified in 6.2. 3.3.2 Switch types not shown on a specification sheet. Where the specification sheet does not show a specific switch type (see 3.3.1), the individual part requirements shall be as specified in comp
25、lementary documents such as manufacturers drawings or data sheets (see 6.2). The switches shall be a product of the basic style, design and construction as the switches shown on the specification sheets and shall be acquired from a source listed on the qualified products list for the same specificat
26、ion sheet (see 3.2). Unless otherwise specified (see 6.2), the individual switch shall comply with the inspection requirements shown in 4.6. 3.4 Material. Unless otherwise specified (see 6.2), material shall be as specified herein. When a definite material is not specified, a material which will ena
27、ble the switches to meet the performance requirements of this specification shall be used. Acceptance of any constituent material shall not be construed as a guarantee of the acceptance of the finished product. 3.4.1 Metals. Metals shall be of sea water corrosion-resistant alloys or shall be zinc pl
28、ated in accordance with ASTM B 633; nickel plated in accordance with class 1, grade G of SAE-AMS-QQ-N-290 or anodized in accordance with MIL-A-8625 (aluminum alloys only), to resist corrosion. 3.4.1.1 Aluminum. Aluminum shall not be used for major structural parts, such as the front plate, bushing,
29、shaft, detent, and shall not be used for current carrying. 3.4.1.2 Ferrous material. Ferrous material shall not be used for current carrying parts. 3.4.1.3 Dissimilar metals. When dissimilar metals are used in intimate contact with each other, protection against electrolysis and corrosion shall be p
30、rovided. The use of dissimilar metals in contact, which tend toward active electrolytic corrosion (particularly copper alloys, copper, steel used in contact with aluminums or aluminum alloy) is not acceptable. However, metal plating or metal spraying of dissimilar base metals to provide similar or s
31、uitable abutting surfaces is permitted. The use of dissimilar metals separated by a suitable insulating material is also permitted. 3.4.1.4 Lubrication. 3.4.1.4.1 Operating mechanism. The operating mechanism and other mechanical moving parts shall be lubricated with a compound that shall enable the
32、switch to meet the performance requirements of this document. For additional information and guidance on lubricating compounds see 6.10. 3.4.1.4.2 Contacts. Contacts shall be lubricated to enable the switch to meet the performance requirements of this document. For additional information and guidanc
33、e on lubricating compounds see 6.10. The method for fabricating the contacts shall result in the application of a minute amount of lubrication on the contacts. 3.4.1.5 Pure tin. The use of pure tin, as an underplate or final finish, is prohibited both internally and externally. Tin content of switch
34、 components and solder shall not exceed 97 percent, by mass. Tin shall be alloyed with a minimum of 3 percent lead, by mass (see 6.16). Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-15291G 5 3.4.2 Insulation. 3.4.2.1 Plastic laminates. Plas
35、tic laminates when used, shall be selected to enable the switch to meet performance requirements of this specification. For additional information and guidance on plastic laminates see 6.11. 3.4.2.2 Plastic molding. Plastic molding material shall be selected to enable the switch to meet performance
36、requirements of this specification. Color shall be gray, approximating color chip Number 26307 of FED-STD-595. Molded parts shall be free of flash. For additional information and guidance on plastic molding see 6.12. 3.4.2.3 Fungus-resistance. Insulation material shall be non-fungus nutrient. 3.4.2.
37、4 Flammable material. Insulation material shall be fire retardant. 3.5 Design and construction. Switches shall be of closed construction so that the switching mechanism and the switching contacts are fully enclosed (except terminals and unused terminal locations), to prevent foreign matter from ente
38、ring the switch mechanism or interfering with the contacts. Switches shall be constructed to ensure proper operation when mounted in any position. The switches shall be of the design, construction, class, and physical dimensions specified (see 3.1) and the switch circuit configuration shall conform
39、to the applicable switching characteristics specified (see 3.1 and 6.2). 3.5.1 Assembled switches. Parts of the assembled switch shall work freely and the switch shall be positive in action. 3.5.2 Relation of parts. In assembling the switch, the relationship between the handle shaft assembly and the
40、 switch blades shall be as specified in 3.1 so that the shaft or handle positions will agree with the mounting of switches in electrical switchboards and equipment. 3.5.3 Contact mating. The moving switch blade contacts shall mate with both sides of the stationary contacts at the contact engagement
41、areas with uniform positive pressure. 3.5.4 Threaded parts. Unless otherwise specified (see 3.1 and 6.2), threaded parts shall be in accordance with FED-STD-H28. Wherever possible, unified screw threads shall be used. Where a special diameter-pitch combination is required, the thread shall be of Ame
42、rican National Form and of any pitch which is used in the fine-thread series. 3.5.4.1 Engagement of threaded parts. Threaded parts shall engage at least three full threads in soft metals like aluminum and its alloys. Not less than two full threads shall be used in harder materials such as brass or s
43、teel. When a screw mates with a plastic part, a threaded metal insert shall be molded therein. 3.5.5 Locking of screw-thread assemblies. Unless otherwise specified (see 3.1), except for terminal hardware screw-thread assemblies shall be rendered resistant to loosening under vibration. Unless otherwi
44、se specified (see 3.1), bronze, stainless steel or plated steel split type, or internal-tooth lockwashers shall be provided under nuts or screw heads. The use of locknuts is permitted in lieu of lockwashers. 3.5.6 Terminal Hardware. The terminal hardware shall be as specified (see 3.1 and 6.2). If t
45、he terminal hardware is not assembled to the switch, it shall be placed in a bag and firmly secured to the switch. 3.5.7 Moving contact material. Moving contact material shall be selected to enable the switch to meet performance requirements of this specification. For additional information and guid
46、ance on moving contact material see 6.13. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-15291G 6 3.5.8 Stationary contact material. Stationary contact material shall be selected to enable the switch to meet performance requirements of this
47、specification. Threaded holes shall have not less than three full threads. For additional information and guidance on stationary contact material see 6.14. 3.5.9 Contact studs. For rear connected switches, the contact studs shall allow the switch to meet the performance requirements of this document
48、. For additional information and guidance on contact studs material see 6.15. 3.5.10 Handles. Unless otherwise specified (see 6.2), switches shall be provided with handles as specified (see 3.1). 3.5.11 Operating shafts. The operating shaft shall be insulated from current carrying members. 3.5.12 Re
49、ar support for front mounted switch assemblies. Rear support is recommended for front mounted switch assemblies where the total number of decks, including spacers, exceeds 9 and shall have features which will readily allow attachment of brackets or other supports to the rear of the switch. 3.6 Performance. 3.6.1 Operation. Class SR switches shall transfer from one position to the next adjacent position, in either direction, when the handle sh
