Which component is crucial for connecting multiple low-voltage devices together?

The selection of the connector as the correct answer highlights its essential role in establishing a physical and electrical connection between multiple low-voltage devices. Connectors are designed to facilitate the secure and reliable joining of wires or cables, allowing for communication and power transfer between various devices in a low-voltage system.

In applications involving limited-energy cabling, connectors ensure compatibility between different components, such as sensors, cameras, and controls, by providing the necessary interface for signals and power. The proper selection and use of connectors can enhance the overall functionality and efficiency of the system by ensuring that connections are both reliable and safe.

While other components like switches, transformers, and relays serve important roles in electrical circuits—such as controlling current flow, isolating voltage levels, or switching devices on and off—they do not primarily function to directly connect multiple low-voltage devices together. Therefore, the connector stands out as the key component for achieving connections among these devices in a limited-energy context.