Expulsion Fuses
72Pages

Expulsion Fuses Eaton Expulsion Fuses Product Overview Product Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Catalog Numbers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Rellable and Replaceable Fuses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Outdoor Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . RBA and RDB Type Fuses Product Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Operation and Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Catalog Number Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Interrupting Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Product Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Product Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Construction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Interruption and Protection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Testing and Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Catalog Number Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Interrupting Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Product Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Product Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Catalog Number Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Interrupting Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Product Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Product Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Catalog Number Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Interrupting Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Product Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Application Transformer Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Repetitive Faults. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Fuse Selection Voltage Rating. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Interrupting Rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Continuous Current Rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Coordination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Expulsion Fuses Product Overview Eaton Expulsion Fuses Catalog Numbers . . . . . . . . . . . . . . . . . . . . . . . . . . Rellable and Replaceable Fuses. . . . . . . . . . . . . . Outdoor Applications . . . . . . . . . . . . . . . . . . . . . . . Product Description Eaton’s expulsion fuses use boric acid as the interrupting medium. Under a fault condition, arc heat decomposes the boric acid into water vapor. The water vapor blast de-ionizes the arc path preventing arc re-ignition after a natural current zero. RBA type indoor expulsion fuses must be fitted with a discharge filter or...

Expulsion Fuses Product Overview Rellable and Replaceable Fuses Outdoor Applications rating. A discharge filter is available that restricts discharge but not to a level that causes a reduction in the interrupting rating. A high capacity discharge filter is also available, but its use is restricted to certain applications on 15.5 kV equipment at maximum voltages below 14.4 kV. This device allows a higher interrupting rating, but allows more discharge. Boric acid expulsion power fuses are divided into two types, refillable and replaceable. Refillable fuses are constructed so that the...

Expulsion Fuses Fuse Selection Fuse Selection Interrupting Rating . . . . . . . . . . . . . . . . . . . . . . Continuous Current Rating . . . . . . . . . . . . . . . . Coordination . . . . . . . . . . . . . . . . . . . . . . . . . . . Fuse Selection There are four factors involved in the selection of a boric acid expulsion fuse. The first three considerations are the rated maximum voltage, the rated maximum interrupting current including the rate of rise of the transient recovery voltage, and the rated continuous current of the fuse. Proper attention must be given to each of these as...

Expulsion Fuses Fuse Selection Interrupting Rating The rated maximum interrupting current of a boric acid expulsion fuse is the rms value of the symmetrical AC component of the highest current that the fuse has been demonstrated to be able to interrupt under any conditions of asymmetry with specified circuit conditions. In other words, the rated maximum interrupting current denotes the maximum symmetrical fault current permitted at the fuse location. Historically, boric acid expulsion fuses have alternately been rated in terms of asymmetrical fault current. Asymmetrical currents are related...