What is a device actuated by another device that governs the operation of succeeding devices called?

The term that describes a device actuated by another device to govern the operation of succeeding devices is "interlock." An interlock is designed to ensure that different systems or components work together in a safe and efficient manner, typically preventing certain actions from occurring unless specific conditions are met. This could involve ensuring that a machine only operates when safety guards are in place or that multiple devices operate in a coordinated sequence for optimal functionality.

While other options refer to related concepts, they do not fully encapsulate the idea of a device directly controlling the operation of subsequent devices in the way that an interlock does. For instance, a relay is an electromechanical switch used for controlling a circuit, often activated by another electrical signal, but it does not inherently manage a sequence of operations like an interlock. A control system generally refers to a broader set of devices and algorithms that manage and regulate other systems, while a switch is a more straightforward device that simply opens or closes a circuit without the governing aspect that is characteristic of interlocks. Thus, an interlock is the most fitting term for the operation described in the question.