What is the rated current of the resettable fuse at the power port of a data center switch?

The rated current of the self-resetting fuse for the power port of a data center switch needs to be selected based on the maximum power consumption of the equipment. For a typical 12V/5A input scenario, the SMD2920-500-16V (holding current 5A, withstand voltage 16V) is selected. This device has a non-operating current of 5.0A and an operating current of 10.0A in a 25℃ environment, an initial resistance of 0.015Ω, and a power consumption of <1.5W, meeting the surge recovery requirements of IEC61000-4-5. For the 48V power supply port of a PoE switch, the SMD2920-150-60V (holding current 1.5A, withstand voltage 60V) is selected to protect the powered equipment from short circuits. It needs to be derated during the design. In a high-temperature environment of 55℃, the current is derated to 80% of the nominal value, i.e., 1.2A.