1、 AMSC N/A FSC 5920 W-F-1814/57D 15 November 2013 SUPERSEDING W-F-1814/57C 20 November 2009 FEDERAL SPECIFICATION SHEET FUSE, CARTRIDGE, HIGH INTERRUPTING CAPACITY, CLASSES RK1 AND RK5 (CURRENT-LIMITING) 250 VOLTS, 31-60 AMPERES The General Services Administration has authorized the use of this feder
2、al specification sheet by all federal agencies. The complete requirements for procuring the fuses described herein shall consist of this document and the latest issue in effect of W-F-1814. FIGURE 1. Classes RK1 and RK5 fuses, 250 volts, 31-60 amperes. INCH-POUND Provided by IHSNot for ResaleNo repr
3、oduction or networking permitted without license from IHS-,-,-W-F-1814/57D 2 Ltr Inches mm Ltr Inches mm Min Max Min Max Min Max Min Max A 2.970 3.030 75.44 76.96 H .165 .175 4.19 4.45 B .620 - 15.75 - J .026 .036 .66 .91 C .183 .193 4.65 4.90 K .080 .090 2.03 2.29 D .085 .130 2.16 3.30 L .125 .135
4、3.18 3.43 E - .780 - 19.81 M .081 .091 2.06 2.31 F .804 .820 20.42 20.83 N .183 .193 4.65 4.90 G .118 .128 2.30 3.25 NOTES: 1. Dimensions are in inches. 2. Metric equivalents are given for general information only. 3. Solid line indicates location, shape, and dimensions for minimum rejection groove.
5、 4. Dashed line indicates location, shape, and dimensions for maximum rejection groove. 5. Unless otherwise specified, tolerances are .02 (0.51 mm) for two-place decimals and .005 (0.13 mm) for three-place decimals. FIGURE 1. Classes RK1 and RK5 fuses, 250 volts, 31-60 amperes continued. Provided by
6、 IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-W-F-1814/57D 3 REQUIREMENTS: Interface and physical dimensions: See figure 1. Physical: Nonrenewable. Terminals: Ferrule type. The ferrules shall be approximately circular in cross-section. Material: Brass, copper
7、, or copper alloy. Strength: 5 inch-pound torque between body and ferrules. Alignment: The inside diameter of tubular gauge shall be not more than .823 inch (20.90 mm). Body: Insulating material: Fiber, ceramic, melamine-impregnated glass fiber, or other suitable material. Electrical: Voltage: 250 v
8、olts or less. Frequency: 48 Hz to 60 Hz. Current: See table I. Current carrying capacity: 110 percent of rated current indefinitely with temperature rise not to exceed 50C (90F) above ambient on the body and the ferrules. Overload interrupt: Instantaneous: Shall interrupt within 1 hour at 135 percen
9、t of rated current and within 4 minutes at 200 percent of rated current. Time delay: In addition to the above requirement, the fuse shall not interrupt 500 percent of rated current within 10 seconds. Interrupting capacity rating: 200,000 amperes rms symmetrical at 250 volts, 48 to 60 Hz and a power
10、factor of 20 percent or less. Closing angle shall be essentially at the zero of the voltage wave (maximum offset) or later, to produce start of arcing within 30 electrical degrees prior to system peak voltage. Threshold ratio: 30 maximum for RK1; 65 maximum for RK5. Peak let-thru current: See table
11、II. Maximum clearing I2T: See table II. Applicable fuseholder: Class R for ferrule type fuses in accordance with UL 4248-12. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-W-F-1814/57D 4 Part or Identifying Number (PIN): The Government PIN shall con
12、sist of the prefix “WF1814/57-“ followed by the PIN designation shown in table I. TABLE I. Current rating and PIN designation. Current in amperes PIN designation RK5 RK1 Instantaneous Time delay Instantaneous Time delay 35 F535 D535 F135 D135 40 F540 D540 F140 D140 45 F545 D545 F145 D145 50 F550 D55
13、0 F150 D150 55 F555 D555 F155 D155 60 F560 D560 F160 D160 TABLE II. Peak let-thru and I2T current. Between threshold and 50 kA 100 kA 200 kA RK1 RK5 RK1 RK5 RK1 RK5 Maximum acceptable peak let-thru current (Ipx 103) 10 20 12 21 16 26 Maximum clearing I2T (amperes squared seconds) (I2T x 103) 40 200
14、40 200 50 200 Referenced documents. In addition to W-F-1814, this document references the following: UL 4248-12 The margins of this specification sheet are marked with vertical lines to indicate where changes from the previous issue were made. This was done as a convenience only and the Government a
15、ssumes no liability whatsoever for any inaccuracies in these notations. Bidders and contractors are cautioned to evaluate the requirements of this document based on the entire content irrespective of the marginal notations and relationship to the last previous issue. Provided by IHSNot for ResaleNo
16、reproduction or networking permitted without license from IHS-,-,-W-F-1814/57D 5 MILITARY INTEREST: CIVIL AGENCY COORDINATING ACTIVITIES: Custodians: GSA - FAS Army - CR Navy - EC Preparing activity: Air Force - 85 DLA - CC DLA - CC Review activities: (Project 5920-2013-015) Army - AR, AT, CR4 Navy
17、- OS NSA - NS NOTE: The activities listed above were interested in this document as of the date of this document. Since organizations and responsibilities can change, you should verify the currency of the information above using the ASSIST Online database at https:/assist.dla.mil. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
