What is the meaning of "maintaining temperature" in temperature fuse?

Question: What does "keep the temperature" mean in the temperature fuse?
 
A: Maintaining the temperature means that the rated current can continuously maintain the on-state for 168 hours in the temperature fuse. In this case, the temperature fuse can withstand the highest temperature that does not change the current state of electricity. 
 
English: the maximum temperature at which a thermal cutoff can be maintained while conducting rated current for 168 hour without functioning.