MF-RG400-0 is a PTC resettable fuse from Bourns' MF-RG Series designed for automotive circuit protection applications where space is limited and fast tripping is required. This radial-leaded device features a maximum voltage rating of 16 V, maximum current of 100 A, and a trip current (Itrip) of 4.00 A at 23°C with an initial resistance of 6.80 Ohms. The device exhibits a 1-hour post-trip resistance of 0.021 Ohms maximum and a maximum time to trip of 0.0600 seconds at 23°C, with typical tripped power dissipation of 1.7 W. The MF-RG400-0 is AEC-Q200 Rev-C compliant, RoHS compliant, halogen-free, and carries cUS agency recognition, making it suitable for demanding automotive environments operating from -40°C to +85°C. Its compact radial-leaded design and fast-acting characteristics provide reliable overcurrent protection in space-constrained automotive applications.