8504.40.40.00 - Speed drive controllers for electric motors

This HTS classification, 8504.40.40.00, specifically covers speed drive controllers designed for electric motors. These devices are essential components within electrical systems, acting as static converters that regulate the speed and torque of electric motors. Their primary function is to control the motor's operational parameters, enabling adjustments for various industrial and commercial applications.

When classifying within heading 8504.40, it's crucial to differentiate this specific category from its siblings. Unlike power supplies for automatic data processing equipment or telecommunication apparatus (subheadings 8504.40.20 and 8504.40.85, respectively), speed drive controllers under 8504.40.40 are distinguished by their direct role in motor speed regulation rather than general power supply functions. The "Other" category (8504.40.95) serves as a residual for static converters not specifically enumerated elsewhere.

As a leaf node, 8504.40.40.00 represents a specific and final classification. Therefore, instead of introducing subcategories, the focus for classification purposes under this code lies in confirming that the unit's primary function is indeed the control of electric motor speed. This includes devices commonly known as Variable Frequency Drives (VFDs), Variable Speed Drives (VSDs), or motor controllers, provided they meet the technical definition of a static converter and are intended for motor speed control.