MF-USML450-2 is a low-ohmic PTC resettable fuse from Bourns designed for automated surface mount assembly in space-constrained mobile applications. The device features a 1210 small footprint with ultra-low resistance of 0.0010 Ohms at 23°C, a maximum voltage rating of 6 V, and a maximum current rating of 50 A. It provides a hold current (Ihold) of 4.50 A and a trip current (Itrip) of 9.00 A, with a maximum time to trip of 22.50 seconds at 23°C and typical tripped power dissipation of 0.8 W. The device is RoHS compliant, halogen-free, and features ENIG-plated terminals for reliable soldering. It is ideal for circuit protection in consumer electronics, telecommunications, and portable devices where fast response and low resistance are critical.