This post explains for the MOSFET.
The Part Number is JCS4N60F.
The function of this semiconductor is 600V, 4A, N-CHANNEL MOSFET.
Manufacturer: Gesar, JILIN SINO-MICROELECTRONICS
Preview images :
This is 600V, 4A, N-Channel MOSFET.
1. Low gate charge
2. Low Crss (typical 9pF )
3. Fast switching
4. 100% avalanche tested
5. Improved dv/dt capability
6. RoHS product
1. High efficiency switch mode power supplies
2. Electronic lamp ballasts based on half bridge