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This heading covers electrical apparatus generally used in power distribution systems. The provisions of Explanatory Note to heading 85.36 apply, mutatis mutandis, as regards the technical characteristics and the functioning of apparatus for switching or protecting electrical circuits, or for making connections to or in electrical circuits. The heading covers apparatus of the kinds described in Explanatory Note to heading 85.36, when for a voltage exceeding 1,000 volts.
These include :(A) Fuses and automatic circuit breakers which automatically interrupt the current when its intensity or voltage exceeds a certain limit. (B) Make-and-break switches specialised for high tension circuits. They are usually of a complex and robust construction having special devices to prevent arcing, and they may have multiple contacts or be remote controlled by different means (e.g., levers, servomotors). These switches are often mounted in containers of metal or insulating material, which have been filled with a fluid (e.g., oil) or a gas, or in which a vacuum has been created. (C) Lightning arresters. These are protective devices designed to protect high tension cables or electrical installations from the effects of lightning; they consist of a device normally insulating to the high tension line but which breaks down and becomes a conducting path to earth in the event of exceptionally high voltages which otherwise would damage the line or electrical installation. Among the many types are metal oxide arresters, carbon granule arresters, arresters consisting of a horned spark gap or guard shield mounted on an insulator or an insulator chain, electrolytic arresters, etc. However, lightning arresters based on the principle of radioactivity are classified in heading 90.22. (D) Voltage limiters. These are devices intended to ensure that the potential difference between two conductors or between the conductors and the earth does not exceed a predetermined value. These devices are sometimes constructed in the same manner as discharge lamps, but not being usable for lighting purposes, they cannot be considered as lamps.
However, the heading does not cover automatic voltage regulators (heading 90.32). (E) Isolating switches are used for isolating sections of a line; they are of the slow break type, but unlike make-and-break switches they are not generally intended to be used when the circuit is loaded. (F) Surge or spike suppressors. These are assemblies of coils, capacitors, etc., inserted in series or in parallel with a line or electrical apparatus to absorb high frequency surges. Simple coils or capacitors used on their own for this purpose remain classified in their respective headings.
PARTS
Subject to the general provisions regarding the classification of parts (see the General Explanatory Note to Section XVI), parts of the apparatus of this heading are classified in heading 85.38. The heading excludes assemblies (other than simple switch assemblies) of the apparatus mentioned above (heading 85.37).
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