UPS tariff classification depends on essential function and composition, not limited similarities with static converters.

UPS classification under the Central Excise Tariff Act, 1985 turns on its essential composition and principal function. A static converter converts AC to DC, while a UPS supplies uninterrupted AC power and includes a battery bank, inverter and transfer switch. Because these apparatus perform different functions and have separate market identity, limited structural similarities were insufficient to treat them as the same goods. The references relied on by the assessee, including circulars and HSN material, were stated not to control classification under the Central Excise Tariff Act. UPS was therefore placed under Heading 85.43, not Heading 85.04.

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Issues: Whether uninterrupted power supply system (UPS) is classifiable under Heading 85.04 as a static converter or under Heading 85.43 of Chapter 85 of the Central Excise Tariff Act, 1985.

Analysis: The distinguishing features of a static converter and a UPS were examined with reference to their composition, function and components. A static converter converts AC to DC and is used to supply DC power, whereas a UPS supplies uninterrupted AC power and necessarily includes a battery bank, inverter and transfer switch. The common features relied upon by the assessee were found insufficient because the dissimilarities were material and showed that the two apparatus are not one and the same. The circular, HSN material, customs classification and other relied upon references were held not to control classification under the Central Excise Tariff Act, 1985. Note 3 to Section XVI was also found inapplicable because the UPS and static converter perform different functions and have separate market identity.

Conclusion: UPS is not classifiable as a static converter under Heading 85.04 and is classifiable under Heading 85.43.

Final Conclusion: The reference was answered by holding that UPS falls under the residuary heading applicable to electrical machines and apparatus having individual functions not specified elsewhere in Chapter 85.

Ratio Decidendi: For tariff classification, an apparatus must be classified according to its essential composition and principal function, and a product with distinct functional components and independent market identity cannot be treated as the same goods as another item merely because of limited structural similarities or overlapping use.

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