MF-R055/90U-2 is a radial-leaded PTC resettable fuse from Bourns' MF-R/90 Series designed to protect circuits with voltage supplies up to 90 V. The device features a hold current (Ihold) of 0.55 A at 23°C and a trip current (Itrip) of 1.1 A, with an initial resistance of 0.9 O and a post-trip resistance of 2.0 O. It is constructed with flame-retardant epoxy polymer insulation meeting UL 94V-0 requirements and is RoHS compliant and halogen-free. The uncoated design (U suffix) has a maximum body height of 10.3 mm with Sn/Cu plated leads of 0.81 mm diameter. This device is ideal for protecting loads in broadband cable power passing taps and set-top boxes, offering reliable resettable protection without requiring manual replacement after a fault event.