Resettable Fuses Raychem Circuit Protection products.Also known as PPTC or Polymer Positive Temperature Coefficient, resettable fuse come in radial, axial or surface mount packages. Key benefits are obviously, the self-resetting function which makes the device transparent to the user as there is no need for replacement. It reduces warranty and service cost and is ideal for remote applications. Key applications include telecom, battery, computing, consumer and medical