MF-R020-AP-99 is a PTC (Positive Temperature Coefficient) resettable fuse from the Bourns MF-R Series, engineered to protect low-voltage power supplies and loads in electronic applications. This radial-leaded device features a maximum voltage rating of 60V and maximum current rating of 40A, with a hold current (Ihold) of 0.20A and trip current (Itrip) of 0.40A at 23°C. The device exhibits an initial resistance of 2.84 Ohms and a post-trip resistance of 4.40 Ohms maximum, with a maximum time to trip of 2.2 seconds at 23°C. The component is constructed with cured, flame-retardant epoxy polymer insulation meeting UL 94V-0 requirements, and is RoHS compliant and halogen-free. It is commonly used in computers, peripherals, and general electronics where automatic circuit protection and resettability are required.