Replacement and OEM components for switching, protecting, and connecting electrical circuits—such as contact assemblies, arc-chute parts, and actuator mechanisms—are captured here when they don't qualify under a more specific parts provision. Correct classification requires confirming both that the part is dedicated to apparatus of the switching/protection family and that no more specific parts heading applies. Supply chains for these components are often deeply integrated with electronics manufacturing hubs, and parts sourced from certain origins may carry Section 301 exposure that differs from the finished apparatus they support.

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