Tariff classification of circuit breaker insulators rejected under specific entries, with residuary heading applied instead.

Insulators used in air blast circuit breakers were held classifiable under the residuary sub-heading, not as electrical apparatus or as transmission-system insulators. The Tribunal reasoned that the tariff heading expressly distinguished electrical apparatus from insulators, so components used in circuit breakers could not be brought under the apparatus entry merely by their function. The specific insulator sub-heading also did not apply because the goods were not usable by themselves and were intended to operate as parts of circuit breakers. The assessee's claim under the specific sub-headings therefore failed.

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Issues: Whether chamber and conduit insulators used in air blast circuit breakers were classifiable under sub-heading (1), sub-heading (3), or sub-heading (7) of Item 85.18/27 of the First Schedule to the Customs Tariff Act, 1975.

Analysis: The main heading specifically referred both to electrical apparatus for making or breaking circuits and to insulators. Sub-heading (3) dealt with electrical apparatus of that kind, while insulators were separately dealt with in the heading and, in the sub-headings, only insulators designed for use in an electrical transmission system of 400 volts or above were specifically covered by sub-heading (7). The Tribunal held that insulators could not be brought into sub-heading (3) merely because they were used as components of circuit breakers, since such a construction would make the residuary sub-heading (1) and the specific insulator entry in sub-heading (7) redundant. The alternative claim under sub-heading (7) also failed because the goods, though meant for use in the system, were not usable by themselves and were intended to function as parts of circuit breakers.

Conclusion: The goods were classifiable under sub-heading (1) of Item 85.18/27 and not under sub-headings (3) or (7); the assessee's claim failed.

Final Conclusion: The tariff heading was construed to place the imported insulators under the residuary classification rather than under the entry for electrical apparatus or the specific transmission-system insulator entry.

Ratio Decidendi: Where a tariff heading expressly contains a separate entry for insulators, they cannot be classified as electrical apparatus merely because they are used as components of such apparatus, unless the specific insulator entry clearly applies.

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