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Mersen DC offers provide a very high performant protection for railway power and auxiliary circuits. Mersen DC Semiconductor fuse-links were developed to provide improved performance required by today's new DC equipment. These fuse-links are typically operated at more elevated temperature than other fuse type, have lower I2t to minimize damage to protected components on short circuits, lower watts loss and longer life. 750 Volts 450 Amps size 122 EF Blades Series.