The MJE340 is a silicon planar NPN transistor intended for use in medium power linear and switching applications. It is mounted in TO126. The complementary PNP type is MJE350.
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.
The EGS002 is a board unit designed for single-phase pure sine wave inverters. Using a single-phase pure sine wave inverter dedicated chip EG8010 as the control chip, the IR2110S driver With LCD Display.