KSD-302 high-current thermostat is a thermostat that uses a bimetallic strip as a temperature sensing component. When the appliance is working normally, the bimetallic strip is in a free state and the contacts are in a closed/open state
The IRFI740G is an N-Channel MOSFET from International Rectifier. It has maximum VDSS rated at 10V and can handle continuous drain current up to 5.4A at 150C. The IRFI740G is a 400V 5.4A 40W TO220F Plastic Package 3Pins Power MOSFET.
The S8550 is a PNP Epitaxial Silicon Transistor. 40V 500mA 2W Output Amplifier of Portable Radios in Class B Push-pull Operation. Complimentary to SS8050.