W-F-1814-66 Fuse, Cartridge, High Interrupting Capacity, Classes Rk1 And Rk5 Current-Limiting 600 Volts, 201-400 Amperes

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W-F-1814/660

Part or Identifying Number (PIN): The Government PIN shall consist of the prefix "WF1814/66-" 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
225 250 300 350 400	F5225 F5250 F5300 F5350 F5400	05225 05250 05300 05350 05400	F1225 F1250 F1300 F1350 F1400	01225 01250 01300 01350 01400

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 (Ip x 103)	33	50	35	60	50	75
Maximum clearing I2T (amperes squared seconds) (I2T x 103)	1200	5000	1200	5000	1600	5000

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 assumes 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.