The typical traffic signal controller assembly is powered by which type of electrical current?

The typical traffic signal controller assembly operates on 120 volts of AC power. This is because standard electrical systems used in residential and commercial environments in North America utilize 120 volts of AC power, making it a prevalent choice for traffic signal systems as well. Traffic signal controllers need a stable and reliable power source to function effectively, and 120 AC volts is widely available and suitable for powering various electronic devices, including controllers.

Using AC power also simplifies the installation process, as the infrastructure for AC power is already established in most areas. The traffic signal controllers then internally convert this AC power to the required DC power levels for their various internal components, ensuring that all parts of the signal system receive the correct type of power they need to operate properly.