8535.29.00.20 - In circuits of 345 kV or more

This HTS category, 8535.29.00.20, specifically classifies automatic circuit breakers designed for use in electrical circuits operating at voltages of 345 kV or more. These are highly specialized protective devices crucial for managing extremely high voltage systems within power grids and large industrial facilities. Their primary function is to automatically interrupt electrical current in the event of a fault, such as a short circuit or overload, thereby preventing damage to equipment and ensuring system stability.

This subcategory is distinguished from its sibling, 8535.29.00.40, by the critical voltage threshold. While both fall under "Other" automatic circuit breakers, this particular classification is reserved for those rated at the extremely high voltage level of 345 kV or above, reflecting the unique engineering and safety requirements associated with such power transmission and distribution infrastructure. The parent heading encompasses a broader range of electrical switching and protection devices for voltages exceeding 1,000 V, with this specific code narrowing the focus to high-capacity, high-voltage automatic circuit breakers.

As this is a leaf node, there are no further subcategories. Therefore, classification within 8535.29.00.20 relies solely on confirming that the automatic circuit breaker in question is intended for circuits of 345 kV or higher. Proper identification of the rated voltage on the device's nameplate or in its technical specifications is essential for accurate classification.