商品簡介
Gurevich (Israel Electric Corporation) reviews the basic principles of relay construction and the major functional parts, and explains the operation of reed, high-voltage, electronic, time, thermal, protective current, power, differential, distance, frequency, and microprocessor- based relays. For each type of relay, the book provides descriptions of several types of relay constructions, each functioning on a different basis, along with black and white photographs of the various products available on the market. Most of the chapters begin with a history of early inventions in the field. Annotation c2006 Book News, Inc., Portland, OR (booknews.com)
