China predominantly operates on a 220VAC, 50Hz electrical system, which is different from the 120VAC, 60Hz system used in some other countries like the United States and parts of North America. When a device, such as a microwave, is manufactured in one country for use in another country with different electrical specifications, there are a few common methods for making it work with the local voltage and frequency:
Internal Transformer: The microwave could be designed with an internal transformer that converts the incoming 220VAC, 50Hz power to the necessary voltage and frequency required for its proper functioning, which, in this case, would be 120VAC, 60Hz.
Dual Voltage Capability: Some modern electronic devices, including certain microwaves, are built with dual voltage capabilities. This means that the device can accept both 120VAC and 220VAC inputs, making it versatile for use in different countries.
External Power Adapter: In some cases, the microwave might come with an external power adapter. This adapter takes the 220VAC, 50Hz power and converts it to the appropriate voltage and frequency required by the microwave.
Manufacturing Variants: Manufacturers might produce different versions of the microwave for different markets. The versions designed for 120VAC, 60Hz countries will have components and electrical configurations that match the local specifications.
It's important to note that the microwave's capability to handle different voltage and frequency specifications should be clearly indicated on its label or user manual. If you are using a microwave made in China designed for 120VAC, 60Hz in a country with a 220VAC, 50Hz electrical system, you should ensure that the appropriate voltage conversion method is employed to avoid damage to the appliance and ensure safe operation. This might involve using a voltage converter or transformer suitable for the microwave's power requirements.