Which of the following is not a part of a fusible disconnect?

A fusible disconnect is a crucial component in electric motor control systems, allowing for safe isolation and protection of electrical circuits. It typically includes several key components. The fuse element is integral for overcurrent protection; it melts when excessive current flows, thereby breaking the circuit. The disconnect switch allows for the manual disconnection of the electrical supply, facilitating maintenance and emergency shutdowns. The enclosure serves to protect these components from environmental factors and provides safety to operators by preventing accidental contact.

When considering the answer choice indicating that "none of the above" are parts of a fusible disconnect, it is clear that this option does not apply because all the mentioned components — the fuse element, disconnect switch, and enclosure — are indeed essential parts of a fusible disconnect. Each part plays a specific role in enhancing the functionality and safety of the system, making the provided answer substantial in affirming the relevance of these components.