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Type X fuse links are specially designed for transformer protection.
Type X fuse links employ dual element construction, which allows the time-current characteristic to be carefully shaped to closely match the IEEE Std C57.91™ Drop-Forged Steel Standard loading curve for transformers while providing excellent surge withstand to avoid nuisance blowing from lightning and switching surges. The nominal speed ratio of Type X fuse links is 32.
Cooper Power Systems (Eaton)
Requiring Overcurrent Protection of Distribution Systems and Equipment