W-F-1814/670
REQUIREMENTS:
Interface and physical dimensions: See figure 1. Physical: Nonrenewable.
Terminals: Knife blade type.
Material: Copper, or copper alloy.
Strength: 5 inch-pound torque between body and blades. Body:
Insulating material: Fiber, ceramic, melamine-impregnated glass fiber, or other suitable material. 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 not to exceed 50°C (90°F) above ambient on the body and 75°C (135°F) on the blades.
Overload interrupt:
Instantaneous: Shall interrupt within 2 hours at 135 percent of rated current and within
12 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 600 volts, 48 Hz 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.
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