The main function of a Distribution Box is to act as a central hub. Inside, the power is split into multiple, smaller circuits that run to different areas—like the kitchen, bedrooms, lighting, and. The Air Conditioning Distribution Box is a critical electrical component that centralizes power distribution for cooling systems while providing protection and ease of maintenance. This article explains what a distribution box does, typical configurations, sizing guidelines, installation. A distribution box, often simply called a DB, is a crucial component in any electrical installation. It ensures that circuits are safe, organized, and easy to manage. It transmits electric energy from the power supply to various electrical equipment through cables or wires, ensuring the normal operation of the power system.