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The ultra-fast, flush-end style aR fuses are mounted in high-quality ceramic housings. They have impregnated quartz sand filling, fuse elements of pure silver, and silver plated copper connections, providing excellent electric insulation, mechanical strength, resistance against thermal shocks during fuse trips, and reduced I²t values. Their structure is designed for direct mount on copper busbars, without requiring individual mounting bases or switch-disconnectors.