Bourns MF-R135-0-99 is a resettable fuse, also known as a PTC (Positive Temperature Coefficient) fuse, designed to protect circuits from overcurrent conditions. Unlike traditional fuses that require replacement after a fault, resettable fuses automatically return to a normal state once the fault is removed. This feature minimizes downtime and maintenance costs. The MF-R series is ideal for applications in computers, peripherals, and general electronics where reliable and automatic overcurrent protection is needed. They are RoHS compliant and halogen free, meeting environmental standards. The fuse's resettable nature and compact size make it a versatile choice for a wide range of electronic devices.