W-F-1814/51C
REQUIREMENTS:
Interface and physical dimensions: See figure 1. Physical: Nonrenewable.
Terminals: Knife blade type.
Material: Brass, copper, or copper alloy.
Strength: 20 pound-inches torque between body and knife blades. Body:
Insulating material: Ceramic, melamine-impregnated glass fiber, or the equivalent. Electrical:
Voltage: 600 volts or less. Frequency: 48 Hz to 60 Hz. Current: See table I.
Current carrying capacity: 110 percent of rated current indefinitely with temperature rise on the terminals not to exceed 65°C above the calibration temperature rise of the test equipment.
Overload interrupt:
Instantaneous: Shall interrupt within 240 minutes at 150 percent of rated current.
Time delay: In addition to the above requirement, the fuse shall not interrupt 500 percent of rated current within 4 seconds.
Interrupting capacity rating: 200,000 amperes rms symmetrical at 600 volts, 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: 40 maximum.
Peak let-thru current: 180x103 amperes maximum. Maximum clearing I2T: 75x106 ampere2 seconds.
Applicable fuseholding device: Fuseholding devices shall provide mounting holes to correspond with those in the fuse as specified. All fuses shall be bolted into fuseholding device during operation.
Part or Identifying Number (PIN): See table I.
2
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