Transcription of FUSE TERMINOLOGY - Cooper Industries
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FUSE TERMINOLOGY - Cooper Industries
1 fuse TERMINOLOGYA mbient Temperature*The temperature of the air surrounding the TimeThe amount of time that passes from the instant the fuse ele-ment or link has melted until the overcurrent is interrupted CurrentRefer to ALTERNATING CURRENT. A-C current is asymmetricalwhen the loops about a zero axis are unequal (offset). This con-dition is usually associated with the first five or less cycles offault current flow in a circuit that has inductive reactance. Allpower distribution systems have a variable amount of *The part of the fuse which encloses the fuse elements and sup-ports the contacts. Also referred to as cartridge, tube or FaultThis refers to a zero impedance fault considered at locations ina power system where the maximum value of available fault cur-rent is specially designed narrow portion of a fuse link that heatsfastest under overcurrent conditions to open fuse *A fuse consisting of a current responsive element inside a fusebody with contacts on both Size*The range of voltage and ampere ratings assigned to a cartridgeof specific dimensions and I2t (Ampere Squared Seconds)*The measure of heat energy developed as a result of currentflow between the time that current begins to flow and until thefuse clears the circuit.
2 FUSE TERMINOLOGY I2t (Amperes Squared Seconds) This is a value obtained by multiplying an effective current squared by the time of flow of the current in seconds. It is not a
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