Back-up Current Limiting Fuse - A current-limiting fuse capable of interrupting all currents from its rated maximum interrupting current down to its rated minimum interrupting current as specified by the manufacturer; defined by ANSI C37.40-1981 or latest issue. Current Limiting Fuse - Back-up - A current-limiting fuse capable of interrupting all currents from its rated maximum interrupting current down to its rated minimum interrupting current as specified by the manufacturer.
Full Range - A current-limiting fuse capable of interrupting all currents from the maximum rated interrupting current down to the minimum continuous current that causes melting or the fusible element(s), when the fuse is applied at maximum ambient temperature specified by the fuse manufacturer.
General Purpose - A current-limiting fuse capable of interrupting all currents from its rated maximum interrupting current down to that current which causes melting or the fusible element in one hour.
Dual Element Fuse Link - A fuse link whose construction consists of two separate elements in series. In general, one element clears the low current faults and the other element clears the higher current faults within the rating of the fuse (refer to D-Link). Dual Sensing Fuse Link - An under-oil expulsion fuse made of an eutectic element which melts when a combined top oil temperature rise due to ambient conditions and loading plus temperature rise due to current flow of 145° is reached. Electric Fuse - see Fuse Fuse - A device that will heat up, melt and electrically open the circuit after a period of prolonged abnormal current flow. Fuse Arcing Time - The amount of time required of the fuse to extinguish the arc and clear the circuit; the specific amount of time required for an interrupter to clear a circuit after its fusible element has melted.
Buttonhead Fuse - A relatively common type of expulsion fuse utilized in open or enclosed cutouts; the name given to the upper assembly of a distribution fuse link which is then used in a reusable fuseholder for outdoor cutout applications.
Fuse Canister - Dry well full range current-limiting fuse holder - loadbreak and non-loadbreak. Fuses are mounted in an oil tight canister which extends into the tank beneath the oil. Accessible from the high voltage compartment, the fuse is air insulated.
Cartridge Fuse - Expulsion type fuse with either current sensing or dual (current and oil temperature) sensing elements mounted internally under-oil. Used to remove an apparatus from the primary circuit in the event of a current fault. Cartridge fuses have limited interrupting ratings.
Fuse Clearing Time - The total time required for the fuse to melt and clear the circuit; melting time plus arching time.
Clip-Mounted Fuse - A full range current-limiting fuse mounted in clips in the high voltage compartment.
Current Sensing Fuse - An expulsion fuse having elements whose characteristics are not affected by elevated oil temperatures; a fuse having elements that are made of copper, tin or silver that will react to current flow only.
Dual Sensing Fuse - An expulsion transformer fuse having elements that are sensitive to fault current, load current and temperature (top oil); a fuse that senses the top oil temperature of a transformer in addition to the temperature from the current flow; a fuse that can monitor the aging effects of elevated transformer hot spot temperatures regardless of cause; sometimes know as "load" sensing.
Electric Fuse - An overcurrent protective device with a circuit opening fusible part that is heated and severed by the passage of overcurrent through it.
Expulsion Fuse - A replaceable one-shot current interrupting device having definite time current characteristics; a device which has a metal melting element and uses the principles of heated fibers releasing de-ionizing gases, and alternating current passing through a zero reference periodically for arc extinction.
Fuse Link - The (metal) fusible element in an expulsion cutout; the composite construction of materials that house the fusible element.
Fuse Maximum Interrupting Current - That upper current level that a fuse can successfully clear with assured reliability; the maximum current at a specified maximum design voltage that a fuse if required to clear as specified by the manufacturer.
Fuse Maximum Operating Voltage - The maximum voltage that a fuse can properly operate at with assured clearing.
Fusing Melting Time - The amount of time required to melt a fusible element at a specific current.
Fuse Minimum Interrupting Current - That lower limit of current that upon melting a fuse can be assured of successfully clearing; a term generally associated with back-up current-limiting fuses indication the lower limit of current that the fuse can clear upon melting.
Open-Link Fuse - An outdoor expulsion fuse for use in an open-link cutout; a one-shot fuse that is usually suspended between two spring arms which hold the link in tension; a "flipper" fuse.
Sand (silver) Fuse - An abbreviated name for a type of current-limiting fuse that has silver for its element and sand as its surrounding media (refer to Current-Limiting Fuse).
Fuse Spider - The element support material used in a current-limiting fuse of various compositions and design.
Type D Fuse - see definition for D-Link.
Type K Fuse - A specific type of expulsion fuse available in button and open-link configurations. The "K" designation refers to specific time current characteristics, defined by ANSI, allowing customers to purchase fuses from more than one manufacturer without adversely affecting the overall operation of the system.
Type N Fuse - Expulsion fuse links having time current characteristics unique to and defined by individual fuse manufacturers. Since the characteristics are unique, various manufacturers' products cannot be interchangeably used on a distribution system without adversely affecting its operation. In addition to type "N", other links that fall into this category are Type H, Type Q, Type QA, Type KS, Type 200, etc.
Type T Fuse - A specific type of expulsion fuse available in button and open-link configurations. The "T" designation refers to specific time current characteristics as defined by ANSI. In reference to the type "K" links, the type "T" links are time delayed or retarded in operating characteristics.
Weak Link Fuse - A coined name for the cartridge fuse. The name is take from the thought that the fuse would be the weakest link in a chain causing the fuse to open the circuit before equipment is damaged.
Power Fuse - A power fuse (expulsion and current-limiting) has high voltage ratings of 2.8-167 kV and x/r ratios of 15-25. |
