W-F-1814/610
Interrupting capacity rating: 200,000 amperes rms symmetrical at 250 volts, 48 to 60 Hz and a power 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 II.
Maximum clearing I2T: See table II.
Applicable fuseholder: Class R for blade type fuses in accordance with UL 4248-12.
Part or Identifying Number (PIN): The Government PIN shall consist of the prefix "WF1814/61-" followed by the PIN designation shown in table I.
TABLE I. Current rating and PIN designation.
Current in amperes |
PIN designation |
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RK5 |
RK1 |
|||
Instantaneous |
Time delay |
Instantaneous |
Time delay |
|
450 500 600 |
F5450 F5500 F5600 |
05450 05500 05600 |
F1450 F1500 F1600 |
01450 01500 01600 |
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 (I x 103) p |
43 |
65 |
50 |
80 |
70 |
100 |
Maximum clearing I2T (amperes squared seconds) (I2T x 103) |
3000 |
10000 |
3000 |
10000 |
4000 |
12000 |
Referenced documents. In addition to W-F-1814, this document references the following:
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