1、flIL-DTL-L37LBF m 99999Ob 20753Lb 2TB m . IINCH-POUND 1 30 September 1998 SUPERSEDING 25 September 1997 MIL-DTL-13718F MIL-PRF- 1371 SE DETAIL SPECIFICATION RELAYS, ELECTROMAGNETIC 24 VOLT DC This specification is approved for use by all Departments and Agencies of the Department of Defense. 1. SCOP
2、E 1.1 Scope. This specification covers 24 volt direct current (Vdc) electromagnetic relays (see 6.1). 1.2 Classification. Relays are of the following types and grades as specified (see 6.2): Type 1 - Continuous duty. Type II - Intermittent duty. Grade A - Waterproof. Grade B - Nonwaterproof. 2. APPL
3、ICABLE DOCUMENTS 2.1 General. The documents listed in this section are specified in sections 3 and 4 of this specification. This section does not include documents in other sections of this specification or recommended for additional information or as examples. While every effort has been made to en
4、sure the completeness of this list, document users are cautioned that they must meet ail specified requirement documents cited in sections 3 and 4 of this specification, whether or not they are listed. Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of
5、 use in improving this document should be addressed to: U.S. Army Tank-automotive and Armaments Command, ATTN: AMSTA-TR-EBLUE, Warren, MI 48397-5000, by using the Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document, or by letter. AMSC N/A FSC 2920 DISTR
6、IBUTION STATEMENT A. Approved for public release; distribution is unlimited. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-13718F 2.2 Government documents. 2.2.1 Specifications. standards. and handbooks. The following specifications, standa
7、rds, and handbooks form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those listed in the issue of the Department of Defense Index of Specifications and Standards (DoDISS) and supplement thereto, cited in the solicitation (see 6
8、.2). STANDARDS DEPARTMENT OF DEFENSE MIL-STD-8 1 O - Environmental Test Methods and Engineering Guidelines. (Unless otherwise indicated, copies of the above standards is available from the Standardization Document Order Desk, 700 Robbins Avenue, Building 4D, Philadelphia, PA 19 1 1 1-5094.) 2.2.2 Ot
9、her Government documents. drawings. and publications. The following other Government documents, drawings, and publications form a part of this document to the extent specified herein. Unless otherwise specified, the issues are those cited in the solicitation. DRAWINGS ARMY 77 17664 - Relay, Current.
10、 8724750 8762321 - Relay, Solenoid. 10894808 - Relay and Housing Assembly. - Relay and Housing Assembly. (Copies of these drawings are available Com the U.S. Army Tank-automotive and Armaments Command, AT“: AMSTA-TR-EBLUE, Warren, MI 48397-5000.) 2.3 Non-Government mblications. The following documen
11、ts form a part of this document to the extent specified herein. Unless otherwise specified, the issues of the documents which are DoD adopted are those listed in the issue of the DoDISS cited in the solicitation. Unless otherwise specified, the issues of documents not listed in the DoDISS are the is
12、sues of the documents cited in the solicitation (see 6.2). 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-13718F AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) ASTM B117 ASTM G21 - Operating Salt Spray (Fog) Apparatus, Standard Practice
13、 - Determining Resistance of Synthetic Polymeric Materiais for. to Fungi, Standard Practice for. (Application for copies of ASTM publications may be obtained Com the American Society for Testing and Materials, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959.) 2.4 Order of precedence. In the
14、event of a conflict between the text of this document and the references cited herein, the text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained. 3. REQUIREMENTS 3.1 First article. When spec
15、ified (see 6.2), a sample shall be subjected to first article inspection in accordance with 4.3. 3.2 Materials. Materials used shall be in accordance with the manufacturers materials specifications for relays. The materials shall be as specified in 3.2.1 through 3.2.3.2, and shall be capable of meet
16、ing all the operational and environmental requirements specified herein (see 4.5.1). 3.2.1 Recvcled, recovered, or environmentallv meferable materials. Recycled, recovered, or environmentally preferable materials should be used to the maximum extent possible provided that the material meets or excee
17、ds the operational and maintenance requirements, and promotes economically advantageous life cycle costs. 3.2.2 Dissimilar metals. Except where necessary to complete an electrical circuit, contact between dissimilar metals, which would encourage galvanic action, shall be avoided (see 4.5.1). 3.2.3 I
18、nsulation. 3.2.3.1 Molded. Cotton or cellulose-filled molded materials shall not be used (see 4.5.1). 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-flIL-DTL-1371BF m 9999906 2075319 TO7 H . MIL-DTL- 1 3 7 1 8F 3.2.3.2 Laminated. Cotton base lamin
19、ates shall not be used (see 4.5.1). 3.3 Design and construction. Relays shall be constructed in accordance with Drawings 7717664,8724750,8724750 and 10894808, or as specified (see 6.2). Rating of part shall be as specified on drawing and shall be based upon an ambient temperature of 77 51 5 degrees
20、Fahrenheit (“F) (25 2 8.3 degrees Celsius (“C) (see 4.5.2). 3.3.1 Locking devices. Lock washers, self-locking nuts, safety wires, or other approved locking devices shall be incorporated where specified, or where required to prevent loosening of components (see 4.5.2). 3.3.2 Electrical terminals and
21、connectors. Terminals and connectors shall conform to applicable drawings (see 3.3). Terminals shall have normal current conducting path (see 4.5.2). 3.3.3 Mounting. When brackets are used, they shall be an integral part of relay housing, or shall be securely attached thereto to prevent any movement
22、 between relay and mounting bracket in service, and to permit electrical contact to ground, if needed (see 4.5.2). 3.3.3.1 Ground. The finish around mounting .holes shall permit electrical contact to ground when relay is mounted as in intended use. Tbis requirement does not apply to relays mounted o
23、n insulated bases (see 4.5.2). 3.3.3.2 Position. Relay shall operate as specified herein when mounted in any position (see 4.5.2). 3.3.4 Polarity. Relays shall operate in negatively grounded circuits (see 4.5.2). 3.3.5 Mechanical failure. Construction shall be such that failure of linkage between ac
24、tuator and movable contacts will result in contacts moving to deenergized position when relay is deenergized (see 4.5.2). 3.3.5.1 Springs. Springs shall not be used to transmit current (see 4.5.1 and 4.5.2). 3.3.6 Weight. Weight of relay shaii be as specified on the applicable drawings (see 3.3 and
25、4.5.2) 3.4 Performance. 3.4.1 Terminai toraue resistance. External terminai shall withstand 25 inch-pounds (in-lb) of torque without damage to terminals or adjacent parts (see 4.5.3). 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-L37LBF 9
26、99990b 2075320 729 W MIL-DTL-13718F 3.4.2 Connector strength. Connector shall withstand a load of 20 pounds (lb), applied along connector centerline in a direction away fiom relay housing, without deformation which would prevent attachment of mating connector (see 4.5.4). 3.4.3 Dielectric withstandi
27、ng voltage. Relay shall withstand an applied voltage of 500 volts root mean square (rms) at a frequency of 60 Hertz (Hz) for 60 seconds between terminals, and between each contact terminal and each coil terminal. Insulation materials shall evidence no burning, charring, smoking, or rupture. Relay sh
28、all subsequently meet the requirements of 3.4.6 (see 4.5.5). 3.4.4 Pickuu voltage. Relay pickup voltages shall not exceed maximum value specified 2.7“C) and (-53.8 I2.7“C) (see 4.5.6). on applicable drawings (see 3.3), in any air temperature between 165 f: 5F and -65 k 5F (73.8 3.4.5 Dropout voltage
29、. Relay dropout voltage shall conform to the applicable drawings (see 3.3), in any ambient air temperature between 165 f: 5F and -65 f: 5F (73.8 5 2.7“C) and (-53.8 2 2.7C) (see 4.5.7). 3.4.6 Contact voltage drop. Voltage drop across relay contacts, measured at relay terminals, shall be not more tha
30、n 150 millivolts (mV), except after exposure to conditions of overload (see 3.4.7), endurance (see 3.4.8), inductive load (see 3.4.1 i), or vibration (see 3.4.13 and 4.5.8). 3.4.7 Overload. Relay shall withstand 50 O00 cycles of making and breaking in circuit with a resistive load equal to 2.5 times
31、 normal resistive load rating (see 4.5.9 through 4.5.9.2). Thereafter, voltage drop across relay contacts, measured at relay terminals, shall be not more than 250 mV (see 3.4.6). 3.4.8 Endurance. Relay shall withstand 100 O00 cycles of making and breaking in circuit with a resistance load equal to n
32、ormal resistive load rating (see 4.5.10). Thereafter, voltage drop across relay contacts measured at relay terminals shall be not more than 250 mV (see 3.4.6). 3.4.9 Coil current. Coil current shall conform to values specified on the applicable drawings (see 6.2), when relay is subjected to maximum
33、operating voltage applied to coil terminals (see 4.5.1 1). 3.4.1 O Contact bounce and operating time. Contact bounce and operating time shall conform to the applicable drawings (see 4.5.12 and 6.2). 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
34、MIL-DTL-13718F 9 99999Ob 2075321 bb5 MIL-DTL- 1 3 7 1 8F 3.4.1 1 Inductive load. In an inductive load circuit conforming to the applicable drawings (see 6.2), relay shall withstand 10 O00 cycles of operation (see 4.5.13). Thereafter, voltage drop across relay contacts measured at relay terminals sha
35、ll be not more than 250 mV (see 3.4.6). 3.4.12 Transient voltage characteristics. Any voltage spike generated by relay shall be not more than f 250 volts (see 4.5.14). 3.4.13 Environmental conditions. 3.4.13.1 Vibration. Relays shall withstand in-field operational vibration for 100 hours without any
36、 breakage, loosened parts, or malfunction (see 4.5.15). Thereafter, relay shall withstand 100 cycles of making and breaking in circuit with a resistive load equal to normal resistive load rating (see 3.4.8). Thereafter, voltage drop across relay contacts measured at relay terminals shall be not more
37、 than 250 mV (see 3.4.6). 3.4.13.2 Watemroofhess. Grade A relay shall be waterproof (see 4.5.16). 3.4.13.3 Shock. Relay shall withstand in field operational shock for 100 hours without any breakage, loosened, parts, or malfunction (see 4.5.17). Thereafter, contact bounce and operating time shall con
38、form to the applicable drawings (see 3.3 and 3.4.10). 3.4.13.4 Corrosion resistance. Relay shall withstand a corrosive environment without adversely affecting performance (see 4.5.18). Thereafter, relay shail codorm to the requirements in 3.4.4 and 3.4.5, and shall withstand 500 cycles in conformanc
39、e with the requirements in 3.4.8. 3.4.13.5 Funnus resistance. Relay shall resist fungus growth that adversely affects performance (see 4.5.19). Thereafter, relay shall conform to the requirements in 3.4.4 and 3.4.5, and shail withstand 500 cycles in conformance with the requirements in 3.4.8. 3.5 Fi
40、nish. Cleaning, pretreatment, priming, and painting shall codom to the manufacturers standards. Paint shall not be applied to any grounding surfaces (see 3.3.5.1 and 4.5.2). 3.6 Marking (see 4.5.2). 3.6.1 Identification marking. Identification marking shall be in accordance with the mandacturers sta
41、ndard practices and shall include the following: a. Nomenclature b. Rating: 24 volts, amperes c. Part or Identifying Number (PIN) (see 6.2 and 6.6) 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-J MIL-DTL-1371F m %Ob 2075322 5TL m MIL-DTL-137 18F
42、d. Federal stock number e, Manufacturers name or identification f. Contract number g. Date of manufacture (month, year, e.g., May 91). 3.6.2 Nameplate. Nameplates shall conform to A-A-50271. 3.7 Workmanship. Workmanship shall be such as to assure a product free of burrs, rust, scratches, chips, shar
43、p edges, loose or defective connectors, cracked insulation and faulty soldering (see 4.5.2). 4. VERIFICATION 4.1 Classification of inspections. The inspection requirements specified here in are classified as follows: a. b. Conformance inspection (see 4.4). First article inspection (see 4.3). 4.2 Ins
44、pection conditions. Inspection shall be conducted under general conditions acceptable to the Government. Unless otherwise Specified in the contract (see 6.2) or herein, all tests shall be conducted on samples that have been temperature stabilized for 24 hours at 77 2 15F (25 5 8.3“C); however, soaki
45、ng need not be repeated where tests are continuous at that temperature. 4.2.1 Temperature extremes. When extreme temperatures are required, they shall be as specified in 4.2.1.1 and 4.2.1.2. 4.2.1.1 Low temperature extreme. Relay shall be subjected to a temperature of -65 f 5F (-53.8 2 2.7“C) for 24
46、 hours prior to testing. 4.2.1.2 High temperature extreme. Relay shall be subjected to a temperature of 165 2 5F (73.8 2.7“C) for 24 hours prior to testing. 4.3 First article inmection. Six sample relays shall be subjected to rst article inspection. First article inspection shall consist of examinat
47、ions as specified in 4.5.2, and tests as specified in table I (see 6.3). 4.3.1 Failure. Failure of any sample to conform to any requirement specified herein shall cause the Government to withhold approval of first article until action by the contractor, to correct defects and prevent recurrence, has
48、 been demonstrated and approved by the Government. 7 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-13718F D 9999906 2075323 438 D MIL-DTL-13718F 4.4 Conformance inspection. Conformance inspection shall include the examinations of 4.5.2 and
49、the tests as specified in table II, as specified in the contract (see 6.2 and 6.4). TABLEI. Ord Title Pickup voltage Dropout voltage Contact voltage drop Dielectric withstanding voltage Coil current Inductive load Fungus resistance Contact voltaee time test. To determine conformance to 3.4.1 O, measurements of relay closing times and contact bounce at 28 Vdc shall be taken. Time duration of contact bounce shall be taken
