Which device is not typically used as an input in two-wire control circuits?

In two-wire control circuits, input devices are typically used to initiate or control the operation of a motor or other machinery, and they generally have specific functions in these systems.

A pushbutton switch is commonly employed in such circuits, serving as a momentary input device that activates or deactivates a circuit when pressed. This aligns well with the operational characteristics of two-wire control systems, which rely on direct input to trigger motor operation.

Limit switches are used to determine the position of machinery or components and can serve as input devices to stop or start motors based on specific physical positions. Similarly, foot switches provide hands-free control of equipment, allowing operators to activate or deactivate machinery without needing to use their hands, making them suitable for two-wire control applications.

In contrast, a temperature sensor typically measures temperature rather than directly controlling a circuit. While it can be integrated into a broader control system, it does not function as a direct input in a two-wire control circuit like the other options. Thus, it is not typically categorized as an input device in the context of two-wire control circuits.