The no-load voltage of a microwave oven transformer typically depends on the design and specifications of the specific transformer used in the microwave oven. However, I can provide you with some general information.
Microwave oven transformers (MOTs) are designed to step down the standard household voltage (usually 120 or 230 volts, depending on the region) to the voltage required by the microwave's magnetron tube. The magnetron is the component that generates microwaves for cooking food.
Typically, the secondary winding of a microwave oven transformer produces a high voltage of around 2,000 to 5,000 volts. This high voltage is necessary to power the magnetron and generate the microwaves.
It's essential to exercise caution when dealing with microwave oven transformers, as they can deliver dangerous and potentially lethal voltages. If you need to work with or test a microwave oven transformer, it's best to consult an expert or follow appropriate safety procedures to avoid electrical hazards.