Yes, a built-in microwave typically requires its own dedicated circuit. A dedicated circuit means that the microwave is the only device connected to that circuit and does not share the circuit with other appliances or outlets.
The reason for a dedicated circuit is to ensure that the microwave has sufficient electrical power and to prevent overloading of the circuit. Microwaves typically draw a significant amount of power, especially when they are operating at full capacity. Using a dedicated circuit helps prevent tripping of circuit breakers or blowing of fuses due to excessive electrical load.
When installing a built-in microwave, it is recommended to consult the manufacturer's specifications and local electrical codes to determine the specific electrical requirements. It is also advisable to hire a qualified electrician to ensure the proper installation and to ensure compliance with electrical safety standards.