In a microwave oven, the fuse is designed to blow or trip when there is a fault or safety issue detected. When the door of a microwave oven is open, there are a couple of reasons why the fuse may blow:
- Safety interlock switches: Microwave ovens have safety interlock switches located near the door latch mechanism. These switches are designed to interrupt the power supply when the door is opened. The purpose of these switches is to prevent the microwave from operating while the door is open, thus protecting users from potential harm caused by microwave radiation.
If one or more of these interlock switches becomes faulty or misaligned, the microwave may still attempt to operate even when the door is open. This can cause excessive current flow, leading to the fuse blowing as a safety measure.
- Faulty door latch or misalignment: If the door latch or its components are damaged or misaligned, it can cause the microwave oven to think that the door is closed when it is actually open. This can lead to the microwave continuing to operate, resulting in an overload of electrical current and subsequently blowing the fuse.
In both cases, the blowing of the fuse is a safety mechanism designed to prevent the microwave oven from functioning with an open door, which could potentially lead to radiation leakage or other safety hazards. If you experience a blown fuse when the microwave door is open, it is advisable to have the appliance inspected and repaired by a qualified technician to address the underlying issue with the interlock switches or door latch.