Are resettable fuses for data center switches resistant to the high temperatures in server rooms?

Data center switches typically operate in environments with temperatures ranging from 40-55℃, with internal chassis temperatures rising by 20-30℃. This leads to significant temperature derating of resettable fuses. The Yinte Electronics SMD2920 series (16V/30V/60V) has a rated holding current of 1.5A at 25℃, which needs to be drated to 75% of the nominal value (1.125A) at 60℃, and to 55% (0.825A) at 85℃. Selection should be based on the actual operating temperature and adjusted according to the IEC60738-1 derating curve. For example, in a 55℃ chassis environment, the SMD2920-200-16V (holding current 2.0A) should be selected instead of the 1.5A model. High-temperature models such as the SMD2920L-150-16V (L suffix, lead-free process) are also recommended, with an operating temperature range of -40℃ to +85℃ and a low high-temperature holding current attenuation rate of 5-8%. In actual testing at 60℃, the PTC operated more than 1000 times without performance degradation.