1、AMSC N/A FSC 5920 INCH-POUND MIL-PRF-19207G 13 June 2013 SUPERSEDING MIL-PRF-19207F 15 May 2007 PERFORMANCE SPECIFICATION FUSEHOLDERS, EXTRACTOR POST TYPE, BLOWN FUSE, INDICATING AND NONINDICATING, GENERAL SPECIFICATION FOR This specification is approved for use by all Departments and Agencies of th
2、e Department of Defense. 1. SCOPE 1.1 Scope. This specification covers the general requirements and test procedures for enclosed, panel mounted, extractor post type electrical fuseholders, both blown fuse indicating and nonindicating. 1.2 Classification. Fuseholder types will be of the following cha
3、racteristics, construction, enclosures, and styles as specified below. 1.2.1 Part or Identifying Number (PIN). The PIN designation should be in the following form: FH L 17 G I Component Characteristic (see 1.2.2) Structure (see 1.2.3) Enclosure (see 1.2.4) Style (see 1.2.5) The component is identifi
4、ed by the two-letter symbol “FH” and covers all fuse-holder types under this specification. 1.2.2 Characteristic. The characteristic is identified by a single letter “L” or “N” which signify the following: L - Indicating (blown fuse indication feature) N - Nonindicating. 1.2.3 Structure. The structu
5、re is identified by a two-digit number and indicates the design and physical dimensions of a particular holder as prescribed by a specific performance specification sheet. Comments, suggestions, or questions on this document should be addressed to: DLA Land and Maritime, ATTN: DLA Land and Maritime-
6、VAT, Post Office Box 3990, Columbus, Ohio 43218-3990 or emailed to CircuitProtectdla.mil. Since contact information can change, you may want to verify the currency of this address information using the ASSIST Online database at https:/assist.dla.mil. Provided by IHSNot for ResaleNo reproduction or n
7、etworking permitted without license from IHS-,-,-MIL-PRF-19207G 2 1.2.4 Enclosure. The degree of enclosure is indicated by a single or double letter which denotes the following: U - Unsealed G - Dripproof S - Splashproof W - Watertight WS - Watertight with EMI/RFI shielding WB - Watertight and body
8、sealed WBS - Watertight and body sealed with EMI/RFI shielding 1.2.5 Style. When more than one style of fuseholder is provided within a single type and rating, each style is designated by a single number. When only one style is provided, the style number is omitted from the type designation. 2. APPL
9、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 cited in other sections of this specification or recommended for additional information or as examples. While every effort has been made
10、 to ensure the completeness of this list, document users are cautioned that they must meet all specified requirements of documents cited in sections 3 and 4 of this specification, whether or not they are listed. 2.2 Government documents. 2.2.1 Specifications, standards, and handbooks. The following
11、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 or contract (see 6.2). FEDERAL STANDARDS FED-STD-H28 - Screw-Thread Standards for Federal Services. FED-
12、STD-H28/2 - Screw-Thread Standards for Federal Services Section 2, Unified Inch Screw Threads - UN and UNR Thread Forms. FED-STD-595/26307 - Gray, Semigloss. DEPARTMENT OF DEFENSE SPECIFICATIONS MIL-PRF-15160 - Fuses, Instrument, Power, and Telephone, General Specification for. MIL-PRF-23419 - Fuse,
13、 Cartridge, Instrument Type, General Specification for. (See supplement 1 for list of associated specifications.) DEPARTMENT OF DEFENSE STANDARDS MIL-STD-108 - Definitions of and Basic Requirements for Enclosures for Electric and Electronic Equipment. MIL-STD-202 - Test Methods for Electronic and El
14、ectrical Component Parts. MIL-STD-1285 - Marking of Electrical and Electronic Parts. (Copies of these documents are available online at http:/quicksearch.dla.mil or https:/assist.dla.mil or from DLA Document Services, Building 4/D, 700 Robbins Avenue, Philadelphia, PA 19111-5094). Special notice: Co
15、pies of FED-STD-595/26307 for non-DoD organizations can be obtained only by calling (215) 697-6396, or by faxing (215) 697-9398 for ordering instructions and current price. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-19207G 3 2.3 Non-Gove
16、rnment 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 (see 6.2). INTERNATIONAL ORGANIZATION FOR STANDARDS (ISO) ISO 10012 - Measurement Manage
17、ment Systems - Requirements for Measurement Processes and Measuring Equipment. ISO/IEC 17025 - General Requirements for the Competence of Testing and Calibration Laboratories. (Copies of these documents are available online at http:/www.iso.org/iso/home.html or from the American National Standards I
18、nstitute (ANSI), 1899 L Street, NW, 11th Floor, Washington, DC 20036-3801). UNDERWRITERS LABORATORIES, INCORPORATED (UL) UL 94 - Safety Tests for Flammability of Plastic Materials for Parts in Devices and Appliances, Standard For. (Copies of this document are available online at http:/ or from the U
19、nderwriters Laboratories Incorporated, 2600 N. W. Lake Road, Camas, WA 98607-8542). 2.4 Order of precedence. Unless otherwise noted herein or in the contract, in the event of conflict between the text of this document and the references cited herein (expect for related specification sheets), the tex
20、t 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 Specification sheets. The individual item requirements shall be as specified herein and in accordance with the applica
21、ble specification sheet. In the event of any conflict between the requirements of this specification and the specification sheet, the latter shall govern (see 6.2). 3.2 Qualification. Fuseholders furnished under this specification shall be products that are authorized by the qualifying activity for
22、listing on the applicable qualified products list at the time of award of contract (see 4.4 and 6.3). 3.3 Materials. Materials shall be as specified herein. However, when a definite material is not specified, a material shall be used which will enable the fuseholders to meet the performance requirem
23、ents of this specification. Acceptance or approval of any constituent material shall not be construed as a guaranty of the acceptance of the finished product. 3.3.1 Restricted materials. 3.3.1.2 Flammable material. Material used shall be fire retardant and have a minimum flammability rating of UL 94
24、HB. 3.3.1.3 Toxic and hazardous material. Flammable or explosive material, or material which can produce toxic, suffocating or corrosive fumes, which would be detrimental to the performance of the equipment or health of personnel, shall not be used in construction of the fuseholders. Provided by IHS
25、Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-19207G 4 3.3.2 Plastic material. 3.3.2.1 Body molding. Plastic materials used for the body and carrier moldings shall be selected to enable the fuseholder to meet the performance requirements of this specifica
26、tion (see 6.6). Plastic materials shall be non-fungus nutrient or shall be treated to resist fungus growth. The color of plastic moldings, except transparent caps, shall approximate a light gray semigloss 26307 of FED-STD-595 or equivalent, or black as approved by the qualifying activity. 3.3.2.2 Ca
27、ps (see 3.4.3). 3.3.3 Metals. Metals shall be of a corrosion-resistant type or shall be treated to resist corrosion. 3.3.3.1 Finish, fuse mating surface. Unless otherwise specified (see 3.1), current carrying fuse mating contact surfaces shall be silver plated. Finishes shall provide a good electric
28、al contact to meet the performance requirements of this specification. For guidance on these finishes, see 6.5.1. 3.3.3.2 Finish, non-mating surfaces. Unless otherwise specified (see 3.1), surfaces which do not contact the fuse shall meet the performance requirements of this specification. For guida
29、nce on these finishes, see 6.5.2. 3.3.4 Gaskets. Gaskets, when required (see 3.1), shall be furnished with the fuseholder. 3.3.5 Indicator lamps. Unless otherwise specified (see 3.1), glow lamps, incandescent lamps, or white light emitting diodes (LED) shall be used provided they meet the performanc
30、e requirements specified herein. For guidance on glow and incandescent indicator lamps, see 6.8. 3.3.6 Resistors. Resistors used with indicating lamp type fuseholders shall be as specified in the applicable specification sheet (see 3.1). 3.4 Interface and physical dimensions. Fuseholders shall be of
31、 the interface and physical dimensions specified (see 3.1 and 4.6). 3.4.1 Extractor post type. Extractor post type shall be for panel mounting and shall consist of a tubular body or other enclosure and a removable cap assembly which together encloses the fuse and provides for ready removal and repla
32、cement of the fuse from the front of the panel. 3.4.2 Indicating type. Indicating fuseholders shall be of the lamp or mechanical type (see 3.1). Lamp type fuseholders shall have an indicator lamp which lights when the fuse has blown. Mechanical type shall be provided with clear caps to permit visual
33、 examination of the fuse indicator. 3.4.3 Caps. Caps for fuseholders with indicator lamps shall be made from plastic (see 6.7). Plastic material used for the caps shall be selected to enable fuseholders to meet the performance requirements of this specification. Caps containing neon lamps or mechani
34、cal indicators shall be clear, and essentially colorless. Caps containing incandescent lamps or LED indicators shall be clear or amber color. 3.4.4 Ground test point. Ground test points shall be provided when required (see 3.1). The test points shall be in electrical contact with the associated load
35、 terminals of the fuseholders. The circuits shall be independent of fuses, resistors and indicator lamps. Unless otherwise specified, the test point contact shall be recessed a minimum of .125 inch (3.18 mm) from the outer surface of the cap. The test point holes shall accommodate a test prod .080 i
36、nch .001 inch (2.03 mm 0.03 mm) in diameter and shall facilitate insertion of the test prod. Test point contacts accessible from the extension of assembled fuseholders (caps in place) shall be recessed .062 inch to .375 inch (1.57 mm to 9.53 mm) within the test point holes. The degree of enclosure r
37、equirement shall not be diminished by the test point provision. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-19207G 5 3.4.5 Extraction of fuses. Unless otherwise specified (see 3.1), fuses shall be extracted from the fuseholder body, capti
38、ve with the cap assembly. Fuses shall be removable from the cap assembly without use of any tools. 3.4.6 Mounting hardware. Unless otherwise specified (see 3.1), fuseholders shall be provided with mounting hardware. Mounting hardware shall be a corrosion-resistant metal or shall be a metal treated t
39、o resist corrosion (see 6.9). Unless otherwise specified (see 6.2), mounting hardware, including flat gaskets and sealing washers if applicable, and the terminal hardware shall be assembled on the fuseholder or placed in a sturdy bag attached to the fuseholder. Where mounting nuts or plates are used
40、, a threaded metal insert may be used. 3.4.7 Threaded parts. Unless otherwise specified (see 3.1), threaded terminals and mounting screws shall be in accordance with FED-STD-H28 and FED-STD-H28/2, coarse thread series, except plastic threads around the body of a fuseholder designed for single hole m
41、ounting need not comply, but shall match the threads of the engaging nuts. 3.4.8 Butt contacts. The fuse contacting surface of butt type contacts shall have a diameter not less than 75 percent of the nominal diameter of the ferrule of the specified test fuse (see 3.1). 3.4.9 Solder-lug terminals. Un
42、less otherwise specified (see 3.1), solder-lug terminals shall be treated to facilitate soldering. Coatings such as hot dip or pre-plating are acceptable (see 4.6.3.1, 4.6.21, 6.5). 3.4.10 Riveting. Rivets shall be properly set, flanged, or rolled, with no evidence of fatigue imposed upon the rivets
43、. There shall be no evidence of cracking, chipping, peeling, denting, or other deformation of the material riveted. Riveted electrical joints shall be soldered after riveting. 3.5 Performance. 3.5.1 Enclosure. The degree of fuseholder enclosure seal shall be in accordance with MIL-STD-108, or equiva
44、lent test methods as approved by the qualifying activity, and shall be as specified in 3.5.1.1 through 3.5.1.5 (see 3.1 and 4.6.16). 3.5.1.1 Unsealed. Unsealed fuseholders shall not be required to meet an enclosure requirement. 3.5.1.2 Dripproof. Dripproof fuseholders shall seal against leakage into
45、 the fuseholder or into the enclosure upon which it is mounted (see 4.6.16.2). 3.5.1.3 Splashproof. Splashproof fuseholders shall seal against leakage into the fuseholder or into the enclosure upon which it is mounted (see 4.6.16.3). 3.5.1.4 Watertight. Watertight fuseholders shall seal against leak
46、age into the fuseholder or into the enclosure upon which it is mounted (see 4.6.16.4). 3.5.1.5 Watertight and body sealed. Watertight and body sealed fuseholders shall seal against leakage into the fuseholder or into the enclosure upon which it is mounted (see 4.6.16.5). 3.5.2 Terminal strength. Whe
47、n fuseholders are tested as specified in 4.6.3, the terminals shall not break or loosen and there shall be no damage to the fuseholder body. 3.5.3 Torque strength of inserts, threaded terminals, and molded threads. Inserts and threaded terminals shall not loosen , strip, or deform the threads (see 4
48、.6.20). Fixed terminals shall not rotate. Single hole mounted fuseholders shall not break, strip threads, rotate or pull through the mounting holes. Gaskets shall not be damaged and fuseholder caps shall not bind. Fuseholders shall not depend upon gaskets or O-rings to serve as mounting flanges. 3.5
49、.4 Dielectric withstanding voltage. There shall be no breakdown, flashover, arcing, or current flow in excess of 1 milliampere (mA) (see 4.6.4). 3.5.5 Dielectric withstanding voltage (reduced barometric pressure). When specified (see 3.1), fuseholders shall be tested as specified in 4.6.5. There shall be no breakdown, flashover, arcing, or current flow in excess of 1 mA. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from I
