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Mersen’s First-to-Market Reducer Fuses are a safe permanent solution for decreasing your current rating without using a fuse reducer, which are designed and listed for temporary use only. Certified as a Special Purpose UL/CSA Listed Class RK1 and Class J fuses, these reduced current rating fuses are designed to fit into the next larger size fuse holders, providing the same high reliability performance, durability, and arc flash mitigation as standard Class RK1 or Class J fuses.

The 690/700V Protistor® fuse-links provide maximum flexibility in equipment design and ultimate protection for today's power conversion equipment. These aR ultra-fast acting square body fuse-links are available in different body sizes, each size having multiple worldwide acceptable mounting styles.
The Protistor® have been engineered to provide state-of-the-art protection for semiconductors: diodes, thyristors and IGBT devices. Fuses are assembled with die-cut elements embedded in solidified sand, which helps control arcing characteristics for a lower I²t and high interrupting rating level. All contact surfaces are silver plated and all hardware is non-magnetic.
Each fuse-link can be equipped with a low voltage trip-indicator which can operate a field mountable microswitch.