1、 AMSC N/A FSC 5920 INCH-POUND W-F-1814D 14 March 2013 SUPERSEDING W-F-1814C 07 October 2005 FEDERAL SPECIFICATION FUSES, CARTRIDGE, HIGH-INTERRUPTING CAPACITY The General Services Administration has authorized the use of this federal specification by all federal agencies. 1. SCOPE AND CLASSIFICATION
2、 1.1 Scope. This specification covers the general requirements and test procedures for current-limiting and noncurrent-limiting, nonrenewable, cartridge fuses with interrupting capacity ratings of 100,000 or 200,000 rms symmetrical amperes (see 3.1 and 6.1). 1.2 Classification. Fuses shall be of the
3、 following classes as specified (see 3.1): Class G - Current-limiting, 300 volts, 0-60 amperes Class J - Current-limiting, 600 volts, 0-600 amperes Class K9 - Noncurrent-limiting, 250 and 600 volts, 0-600 amperes Class K5 - Noncurrent-limiting, 250 and 600 volts, 0-600 amperes Class K1 - Noncurrent-
4、limiting, 250 and 600 volts, 0-600 amperes Class RK5 - Current-limiting, 250 and 600 volts, 0-600 amperes Class RK1 - Current-limiting, 250 and 600 volts, 0-600 amperes Class L - Current-limiting, 600 volts, 601-6000 amperes 2. APPLICABLE DOCUMENTS 2.1 General. The documents listed in this section a
5、re 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 to ensure the completeness of this list, document users are caution
6、ed 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 specifications, standards, and handbooks form a part of this documen
7、t to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract (see 6.2). COMMERCIAL ITEM DESCRIPTIONS A-A-59544 - Cable and Wire, Electrical (Power, Fixed Installation). Comments, suggestions, or questions on this document
8、 should be addressed to: DLA Land and Maritime ATTN: DLA Land and Maritime-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
9、at https:/assist.dla.mil. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-W-F-1814D 2 DEPARTMENT OF DEFENSE STANDARDS MIL-STD-202 - Test Methods for Electronic and Electrical Component Parts. (Copies of these documents are available online at https:/
10、assist.dla.mil/quicksearch/ or https:/assist.dla.mil or from DLA Document Services, Building 4/D, 700 Robbins Avenue, Philadelphia, PA 19111-5094). 2.3 Non-Government publications. The following documents form a part of this document to the extent specified herein. Unless otherwise specified, the is
11、sues of these documents are those cited in the solicitation or contract (see 6.2). AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) ASTM B16/B16M - Standard Specification for Free-Cutting Rod Brass, Bar and Shapes for Use in Screw Machines. ASTM B36/B36M - Standard Specification for Brass Plate, Sh
12、eet, Strip, and Rolled Bar. ASTM B121/B121M - Standard Specification for Leaded Brass Plate, Sheet, Strip, and Rolled Bar. ASTM B124/B 124M - Standard Specification for Copper and Copper Alloy Forging Rod, Bar, and Shapes. ASTM B139/B 139M - Standard Specification for Phosphor Bronze Rod, Bar, and S
13、hapes. ASTM B152/B152M - Standard Specification for Copper Sheet, Strip, Plate, and Rolled Bar. ASTM D710 - Standard Specification for Vulcanized Fibre Sheets, Rods, and Tubes used for Electrical Insulation. ASTM B700 Standard Specification for Electrodeposited Coatings of Silver for Engineering use
14、. (Copies of these documents are available online at http:/www.astm.org or from the American Society for Testing Materials International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959). INTERNATIONAL ORGANIZATION FOR STANDARDS (ISO) ISO 10012 - Measurement, Management Systems
15、- Requirements for Measurement Processes and Measuring Equipment. (Copies of this document are available online at http:/www.iso.org/iso/home.html or from the American National Standards Institute (ANSI), 1899 L Street, NW, 11th Floor, Washington, DC 20036-3804). NATIONAL CONFERENCE OF STANDARDS LAB
16、ORATORIES (NCSL) NCSL Z540.3 - Calibration of Measuring and Test Equipment, Requirements for. (Copies of this document are available online at http:/www.ncsli.org/ or from the National Conference of Standards Laboratories, 2995 Wilderness Place, Suite 107, Boulder, CO 80301-5404.) UNDERWRITERS LABOR
17、ATORIES INC. (UL) STANDARDS UL 248-1 - UL Standard for Safety for Low-Voltage Fuses - Part 1: General Requirements. UL 248-5 - UL Standard for Safety for Low Voltage Fuses - Part 5: Class G Fuses. UL 248-8 - UL Standard for Safety for Low Voltage Fuses - Part 8: Class J Fuses. UL 248-9 - UL Standard
18、 for Safety for Low-Voltage Fuses - Part 9: Class K Fuses. UL 248-10 - UL Standard for Safety for Low Voltage Fuses - Part 10: Class L Fuses. UL 248-12 - UL Standard for Safety for Low-Voltage Fuses - Part 12: Class R Fuses. UL 4248-1 - UL Standard for Safety for Fuseholders - Part 1: General Requir
19、ements. (Copies of these documents are available online at http:/ or from the Underwriters Laboratories Incorporated, 2600 N. W. Lake Road, Camas, WA 98607-8542). Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-W-F-1814D 3 3. REQUIREMENTS 3.1 Specifi
20、cation 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 shall govern. 3.1.1 Fuse ratings not listed in s
21、pecification sheets. This specification is applicable to other fuse ratings, provided the desired ratings fall within the maximum and minimum current and voltage ratings specified in the applicable specification sheet. Such fuses shall be considered nonstandard items, and no Government part number w
22、ill be assigned. 3.2 Qualification. Fuses furnished under this specification shall be products that are authorized by the qualifying activity for listing on the applicable qualified products list before award of contract (see 4.5 and 6.3). 3.3 Terms and definitions. The definitions of all terms used
23、 herein shall be as specified in UL 248-1, UL 248-5, UL 248-8, UL 248-9, UL 248-10, and UL 248-12. 3.4 Material. The material for each part shall be as specified herein. However, when a definite material is not specified, a material shall be used which will enable the fuses to meet the performance r
24、equirements of this specification. Acceptance or approval of any constituent material shall not be construed as a guaranty of the acceptance of the finished product. 3.4.1 Recovered materials. Unless otherwise specified herein, all equipment, material, and articles incorporated in the products cover
25、ed by this specification shall be new and may be fabricated using materials produced from recovered materials to the maximum extent practicable without jeopardizing the intended use. The term “recovered materials“ means materials which have been collected or recovered from solid waste and reprocesse
26、d to become source of raw materials, as opposed to virgin raw materials. None of the above shall be interpreted to mean that the use of used or rebuilt products is allowed under this specification unless otherwise specifically specified. 3.4.2 Restricted material. Flammable or explosive material, or
27、 material which can produce toxic or suffocating fumes when the fuses are in service shall not be used in construction of the fuses. 3.4.3 Enclosure. Fuses shall have a suitable enclosure which shall prevent lint and dust collecting near the fusible link and thus becoming ignited during overload and
28、 interrupting capacity rating tests. 3.4.4 Case or body. The tube shall be of hard fiber, ceramic, or melamine-impregnated glass fiber as specified (see 3.1). Other material may be used provided the fuse is capable of meeting the requirements of 3.10. 3.4.4.1 Fiber. Fiber shall conform to grade CH,
29、form T, of ASTM D710. 3.4.4.2 Plastic. Unless otherwise specified (see 3.1), any plastic insulation may be used, except that cotton-base or cotton- or cellulose-filled molding material shall not be used. 3.4.4.3 Epoxy. Epoxy encapsulant compound used shall meet the performance requirements of this s
30、pecification. 3.4.4.4 Adhesives. An adhesive employed in a fuse shall adequately and reliably secure together the parts that it is intended to secure (see 3.10). 3.4.4.5 Current-carrying parts (except fuse element). Current-carrying parts shall be of brass, copper, phosphor bronze, or copper alloy c
31、onforming to ASTM B36/B36M, ASTM B121/B 121M, ASTM B16/B16M, ASTM B124/B 124M, ASTM B152/B152M, ASTM B139/B 139M, respectively. 3.4.4.6 Noncurrent-carrying parts. All metal noncurrent-carrying parts shall be of corrosion resistant material or of material adequately protected against corrosion. 3.5 D
32、esign and construction. Fuses shall be of the design, construction, and physical dimensions specified (see 3.1). Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-W-F-1814D 4 3.5.1 Mounting. Unless otherwise specified (see 3.1), the fuse shall be desig
33、ned for use in fuseholders in accordance with UL 4248-1 and permit convenient insertion and removal from fuseholders without the use of special tools. 3.5.2 Terminals. Terminals shall be secured to the fuse body so that they will not loosen. The fuse element shall be attached to the terminals so tha
34、t there will be no danger of breaking the fuse element or connections when installing the fuse. Fuses with knife blade terminals shall be aligned so that their planes are within 4 degrees of each other. The alignment shall be insured by means other than friction. 3.5.3 Ferrule alignment. Fuses with
35、ferrule terminals shall pass through a tubular gauge having a length not less than that of the fuse. The tubular gauge shall have an internal diameter 0.005 inch greater than the maximum ferrule diameter for fuse lengths up to and including 1.75 inches. For fuse lengths greater than 1.75 inches, the
36、 tubular gauge shall have an internal diameter 0.010 inch greater than the maximum ferrule diameter. 3.5.4 Terminal finish or plating. Ferrules, knife blades, lugs, or other terminals shall be finished (plated, dipped, coated) or shall be natural (no finishing process), as specified (see 3.1). Finis
37、h shall be optional when not specified. 3.5.4.1 Silver plating (see 3.1). Silver plating shall be in accordance with ASTM B700 or equivalent as approved by the qualifying activity, and shall be 99.9 percent pure silver, not coin silver. It shall be not less than .00008 inch (0.002 mm) inch thick. Wh
38、en silver plating is specified, the letter “S“ shall be added as a suffix to the end of the Government part number. 3.6 Terminal strength. When tested as specified in 4.7.2, fuse terminals shall not loosen or become damaged. 3.7 Current carrying capacity. When tested as specified in 4.7.3, fuses sha
39、ll carry the specified percentage of current indefinitely (see 3.1). The temperature of the body shall at no point rise more than the amount specified (see 3.1). 3.8 Watts loss (when specified, see 3.1). When fuses are tested as specified in 4.7.4, the watts loss shall be as specified (see 3.1). 3.9
40、 Overload interrupt. When tested as specified in 4.7.5, fuses shall open the circuit within the time specified (see 3.1) without causing the case or body to char, fracture, or otherwise sustain physical damage. Time delay or dual element fuses shall not open the circuit faster than specified (see 3.
41、1). 3.9.1 Opening at rated voltage. When tested as specified in 4.7.5.1 classes G, J, K, and R fuses shall open the circuit without causing the case or body to char, fracture, or otherwise sustain physical damage. 3.10 Interrupting capacity rating. When fuses are tested as specified in 4.7.6 the int
42、errupting capacity shall be not less than specified (see 3.1). The fuse shall remain intact and permanently open the circuit and shall not ignite cotton, emit molten solder, or permit movement or deformation of either or both end-caps. 3.11 Threshold ratio (when specified, see 3.1). When tested as s
43、pecified in 4.7.7, the fuses shall clear the circuit in the first half cycle after the circuit is closed. The maximum threshold ratio for the fuse shall be as specified (see 3.1). 3.12 Peak let-thru current. When fuses are tested as specified in 4.7.8 , the peak let-thru current shall not exceed the
44、 limit specified (see 3.1). 3.13 Maximum clearing I2T. When fuses are tested as specified in 4.7.9, the amount of ampere-squared seconds passed by the fuse during melting, arcing, and clearing shall not exceed the value specified (see 3.1). Provided by IHSNot for ResaleNo reproduction or networking
45、permitted without license from IHS-,-,-W-F-1814D 5 3.14 Marking. Fuses shall be marked in a manner which will be plainly visible after the fuse has been installed in a standard fuseholder. All markings shall be legible. The marking shall include the following: a. Classes G, J, K1, K5, K9, RK1, RK5,
46、or L as specified (see 3.1). b. Manufacturers name, code, or trademark. c. Current rating in amperes. d. Classes G, J, R, and L fuses shall be identified as “Current Limiting“. (Classes K1, K5, and K9 shall not be identified as current limiting.) e. The interrupting rating (see 3.1). f. Time delay f
47、uses (see 3.1) shall be identified with a letter “D“ or the words “Time Delay“. 3.14.1 Government part number. The Government part number (see 3.1) may be marked on the item at the option of the manufacturer. 3.14.2 Underwriters Listed (UL Listed) mark. Fuses which conform to UL 248-1, UL 248-5, UL
48、248-8, UL 248-9, UL 248-10, or UL 248-12 (see 4.5b), shall have the UL Listed mark on each fuse. 3.15 Soldering. Soldering shall be such as to minimize the spattering of solder and flux onto surrounding surfaces. Only noncorrosive fluxes shall be used, unless it can be shown that all corrosive produ
49、cts have been satisfactorily removed or neutralized after soldering. Soldered connections shall be of a character and quality that the bonding between the soldered items may be determined by visual examination. There shall be no evidence of “cold soldering“, and the use of excessive amounts of solder will not be permitted. 3.16 Recycled, recovered, or environmentally preferable materials. Recycled, recovered, or environmentally preferable materials
