What is the characteristic of a Hot Bus Bar?

A Hot Bus Bar is characterized by its permanent connection to the battery, which allows it to provide a continuous power supply to the electrical systems of an aircraft. This means that whenever the aircraft's electrical system is engaged, the Hot Bus Bar is energized and remains ready to supply power.

This persistent connection is crucial for systems that require immediate power, such as essential avionics and emergency lighting, ensuring they are operational at all times. Such a characteristic distinguishes it from other configurations where power might be temporarily connected or disconnected based on certain conditions (for instance, connecting to a circuit or being only active during flight). In this way, the Hot Bus Bar plays an essential role in the reliability and functionality of an aircraft's electrical system.