MF-MSMF050-2

MF-MSMF050-2 is a Bourns polymeric PTC resettable fuse in 1812, tape and reel — for overcurrent protection that resets itself: USB ports, battery packs and motor drivers. 0.5 A hold / 1 A trip with 0.15 ohm initial resistance is the selection point: it rides through normal load and opens on fault, then recovers without replacement. Lifecycle note: Bourns lists this exact ordering code as NRND — for new designs, the MF-MSMF050/30X-2 (30 V) and MF-MSMF050/60X-2 (60 V) successors are the Active alternatives with the same 0.5 A hold in 1812. Selection advice: size the hold current to the maximum continuous load, not the trip current — nuisance tripping at elevated ambient temperature is the classic PTC sizing mistake. AEC-Q200 rated, −40 °C to +85 °C. Parameters verified against Bourns documentation and distributor listings.