MF-PSHT Multifuse® PTC Resettable Fuse Bourns MF-PSHT Multifuse® PTC Resettable Fuses feature Free Xpansion Design™ technology to increase performance with higher hold currents (Ihold), higher voltages (Vmax), and improved resistance stability in smaller footprints. Bourns MF-PSHT fuses are ideal for protecting automotive circuitry, including engine control modules. These fuses also offer resettable fault protection of general equipment and overcurrent surge protection of electronics equipment at high temperatures.