This part is a kind of semiconductor called KSD-9700.
Function of this product has Thermal Protector.
Manufacturers : BOYECHUANGZHAN ELECTRONICS
Image and pinout :
Some of the text within the PDF file :
SHENZHEN BOYECHUANGZHAN ELECTRONICS CO.,LTD KSD-9700 Series Thermal Protector Features or structure KSD-9700 series thermal protector consists of dish shape high sensitive bimetallic elemeng,movable contact-head,static contact-piece,soleplate,outer case,ghermal resistant lead and so on.When operation,the bimetallic element is in free state and movable contact-head and static contace-piece are closed and the circuit is on.When the electric appliance is in operation is in operation and produces heat caused by some troubles and temperature is raised to the rated action temperature of the product,the bimetallic element produces inner stuess and acts quickly and pushes the movable contact-head and make the vontact point off and the power supply is rurned off the electric appliance stop.in this [ ... ]