The monograph considers the contactless commutation apparatuses, diodes, transistors switches and their electronic structure basic elements including new elements, ultrahigh speed diodes, transil diodes, Metal Oxide Semiconductor Field Effect Transistors (MOSFET), current stabilising diodes, Insulated Gate Bipolar Transistors (IGBT), MOS controlled Thyristors (MCT), fast and improved microschemes KMOP, BiKMOP microschemes, pulse stabilizers, signal converters, electronic transformers, electronic ballasts, power factor conditioners and solid-state relays. The textbook is directed to broad sections of readers being interested in modern industrial electronic elements as well as to the RTU students.