9107.00.40.40 - Time switches that operate on a fixed-time cycle, of a type used in household type refrigerators and combined refrigerator-freezers, to alternately control the operations of the compressor and the defrost unit (defrost timers)

This HTS classification covers specific time switches designed for household refrigeration appliances. These devices are essential for managing the operational cycles of both the compressor and the defrost unit within refrigerators and combined refrigerator-freezers. The defining characteristic of these time switches is their fixed-time cycle operation, ensuring precise and alternating control to maintain optimal food preservation conditions and prevent ice buildup. Their intended use in household refrigerators is a key factor for classification under this specific subheading.

At this level of the tariff schedule, this category is distinguished from its sibling, 9107.00.40.80 "Other," which encompasses all other time switches valued not over $5 each that do not meet the specific criteria outlined here. Therefore, goods classified here must be exclusively intended for and identifiable as components of household refrigerators and combined refrigerator-freezers.

As this is a leaf node, there are no further subcategories. Classification is finalized at this point based on the product's function as a defrost timer for household refrigeration units and its value not exceeding $5. If a time switch, even if used in refrigeration, has a different function or a higher value, it would fall under a different HTS classification.