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3AG is a code for the type of fuse. The "3" means the fuse is 1 1/4" (6.35 mm) in length and 1/4" (31.8 mm) in diameter. The "A" means it has no time delay when overloaded and the "G" means it has a glass construction. There is more information stamped on the fuse cap indicating the maximum amperes in fractions or whole numbers and the maximum voltage the fuse can tolerate.

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13y ago
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Q: What does 3 AG mean on a fuse?
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