The BC337 is an NPN transistor with a maximum gain of 630, commonly used in low power audio applications. It can also switch loads up to 45V and 800mA hence also used as general purpose transistor.
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 2SD880 transistor can have a current gain of 60 to 300. The gain of the 2SD880O will be in the range from 60 to 120, for the 2SD880Y it will be in the range from 100 to 200, for the 2SD880GR it will be in the range from 150 to 300.
The 2SK2462, 2SK-2462, K2462, 2462 is a 100V 15A 30W N-Channel Field Effect Transistor TO-220NIS Package MOSFET, Its designed for high speed switching applications. Low On-Resistance RDS(on)1 = 80 mΩ MAX. (@ VGS = 10 V, ID = 10A).