Mersen Protistor® 10x38 Type gR Fuses From Mersen, a range of cylindrical ultra-rapid fuses available in a wide range of current ratings to suit most applications. These 10 x 38 Protistor® fuses are designed for the protection of inverters, UPS, variable speed drives and similar discrete semiconductor devices. Features and Benefits • gR class according to VDE 636-23 and IEC 60269-4 • Fast acting • Current limiting • 10 x 38 mm universal size • Excellent cycling capability Applications • UPS • Small inverters • Motor drives