2-12As you can see, the new military designation is much easier to understand than the old militarydesignation.You may find a fuse coded in one of the commercial designations. The commercial designations arefairly easy to understand and figure 2-10 shows the old and new commercial designations for the sametype of fuse that was used in figures 2-8 and 2-9.Figure 2-10.—Commercial designations for fuses:OLD COMMERCIAL DESIGNATIONFigure 2-10, view A, shows the old commercial designation for a fuse. The first part of thedesignation is a combination of letters and numbers (three in all) that indicates the style and time delaycharacteristics. This part of the designation (3AG) is the information contained in the style and time delayrating portions of military designations.In the example shown, the code 3AG represents the same information as the underlined portions ofF02 G 1R00 A from figure 2-8 (Old Military Designation) and F02A 250VIAS from figure 2-9 (NewMilitary Designation). The only way to know the time delay rating of this fuse is to look it up in themanufacturer’s catalog or in a cross-reference listing to find the military designation. The catalog will tellyou the physical size, the material from which the fuse is constructed, and the time delay rating of thefuse. A 3AG fuse is a glass-bodied fuse, 1/4 inch 1 1/4 inches (6.35 millimeters 31.8 millimeters) andhas a standard time delay rating.
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