MF-RG Multifuse® PPTC Resettable Fuses Bourns MF-RG Multifuse® PPTC Resettable Fuses provide circuit protection solutions for applications in the automotive, data server, and industrial electronics industries. These fuses can carry high currents and offer a maximum operating voltage (Vrms) of 16V. Bourns MF-RG fuses are ideal for tight spaces and anywhere fast tripping is required.