Specifications

Ver SG 9/200 49 Sharp Electronics Corporation
The other protection circuits used in microwave ovens are thermal fuses and thermal
cutouts. These devices open when they are exposed to high temperatures. They are used
to monitor the temperatures of the oven cavity and magnetron and will interrupt current
flow to the oven circuits when open. Thermal cut outs will reset after cooling down to
their temperature, but temperature fuses remain open.
In some models, thermal cut outs which have a very low reset temperature are used.
These thermal cut outs will not reset after cooling down to room temperature and should
be replaced after the cause of the over heating condition has been repaired.
The oven temperature fuse will open if the oven cavity gets too hot, as is the case of a
food fire. The magnetron temperature fuse will open if the magnetron overheats due to
an abnormal condition such as component malfunction or if the cooling fan becomes
inoperative.