8504.31 - Having a power handling capacity not exceeding 1 kVA:

This HTS category, 8504.31, specifically covers electrical transformers and static converters with a power handling capacity not exceeding 1 kilovolt-ampere (kVA). These devices are fundamental components used to step up or step down voltage in electrical circuits, and their applications are widespread in lower power electronic devices, instrumentation, and control systems. The defining characteristic for classification under this heading is the upper limit of their power rating, distinguishing them from higher capacity transformers.

This classification is differentiated from its sibling categories by its precise power handling limitation. While 8504.31 is for transformers up to 1 kVA, the sibling category 8504.32 pertains to those exceeding 1 kVA but not exceeding 16 kVA. Further sibling categories extend to even higher power ratings (8504.33 for 16 kVA to 500 kVA, and 8504.34 for over 500 kVA). Therefore, the precise measurement of the transformer's power capacity is the critical factor in ensuring correct classification.

Within the 8504.31 category, further subdivisions exist to refine classification based on specific attributes. The subcategory 8504.31.20.00 captures unrated transformers, which may be relevant when a stated power rating is absent or unclear. Following this, the "Other" subcategory provides a catch-all for rated transformers that do not fall into any more specific designations within this power range. This hierarchical structure allows for granular classification based on both power capacity and the presence or absence of a formal rating.