What provides the means of connecting and disconnecting main power?

The terminal block is essential for creating reliable electrical connections, particularly within a system. However, when it comes to the specific function of connecting and disconnecting main power, it is not the most appropriate choice. Terminal blocks are used primarily for facilitating connections between wires and enabling easy maintenance or changes to the circuit without disrupting the entire system. They do not serve the primary purpose of interrupting the power supply to the entire system.

The breaker panel or circuit breaker panel, on the other hand, is designed specifically for this function. It includes circuit breakers that can be switched on or off to control the flow of electricity. When the breakers are turned off, they effectively disconnect the electrical supply to the circuits it serves, which directly addresses the need to connect and disconnect the main power. This makes it the most appropriate choice in the context of managing overall electrical power in a system.