MF-RX300/72-0-14 is a PTC resettable fuse from Bourns' MF-R Series designed for overcurrent protection in electronic circuits. This device features a hold current of 3.0 A, maximum voltage rating of 30 V, and maximum current rating of 40 A, with an initial post-trip resistance of 0.020 O at 23°C. The fuse is housed in a radial leaded package with kinked leads (Style 2), constructed with Sn/Cu lead material and cured flame-retardant epoxy polymer insulation meeting UL 94V-0 requirements. It is RoHS compliant and halogen-free, with agency recognition and AEC-Q200 compliance. This device is ideal for protecting power supplies, battery charging circuits, and other applications requiring automatic resettable overcurrent protection with fast response times.