{ "item_title" : "Solid-State Relays and Electronic Switching", "item_author" : [" James Calder "], "item_description" : "SOLID-STATE RELAYS AND ELECTRONIC SWITCHINGSolid-state relays are widely used in modern industrial systems where fast switching, long service life, silent operation, electrical isolation, and high switching frequency are required. Unlike electromechanical relays, they have no moving contacts, but that does not mean they are simple or failure-free.SOLID-STATE RELAYS AND ELECTRONIC SWITCHING is a practical engineering guide to the selection, application, thermal design, protection, and troubleshooting of semiconductor switching devices used in industrial automation and control systems.The book explains how MOSFET, triac, IGBT, and related switching technologies behave under real electrical loads and why current ratings alone are not enough for reliable design.What You Will LearnOperating principles of solid-state relaysDifferences between AC and DC SSRsMOSFET, triac, SCR, and IGBT switchingZero-cross and random-turn-on switchingInput control circuits and isolationOutput voltage drop and conduction lossesLeakage current in the OFF stateMinimum load current and holding currentSwitching resistive, inductive, capacitive, and heating loadsInrush current and repetitive switching stressdv/dt and di/dt limitationsHeat generation and thermal resistanceHeatsink selection and thermal designJunction temperature and safe operating marginsDerating for ambient temperature and currentShort-circuit and overload protectionFuses, circuit breakers, varistors, and RC snubbersEMI and electrical noise generated by switchingFailure modes of semiconductor relaysOpen-circuit, short-circuit, leakage, and thermal failuresPractical testing and diagnostic methodsCorrect replacement and application selectionPractical Engineering ApproachA solid-state relay may appear to switch correctly and still cause machine problems. Leakage current can keep a small load partially energized. Excessive voltage drop can generate unexpected heat. Poor heatsink selection can destroy a relay even when the load current is below the printed rating.This book connects semiconductor theory with real industrial symptoms.Readers learn how to evaluate the complete switching path from the control signal to the load, calculate thermal stress, understand datasheet limits, identify unsuitable load conditions, and select protective components that reduce the risk of repeated failures.The emphasis is on practical decisions: choosing the correct SSR type, understanding the load, controlling temperature, protecting the semiconductor output, and diagnosing faults without replacing components by trial and error.Who This Book Is ForThis book is intended for industrial electricians, maintenance technicians, automation engineers, electrical engineers, PLC programmers, panel builders, machine builders, commissioning technicians, service personnel, and engineering students.It is especially useful for professionals working with heaters, solenoids, contactors, motors, DC loads, high-cycle switching, PLC outputs, and industrial control panels where semiconductor switching offers advantages over mechanical contacts.This is Book 3 of the Industrial Relay Engineering Series.", "item_img_path" : "https://covers3.booksamillion.com/covers/bam/9/79/819/251/9798192514818_b.jpg", "price_data" : { "retail_price" : "25.90", "online_price" : "25.90", "our_price" : "25.90", "club_price" : "25.90", "savings_pct" : "0", "savings_amt" : "0.00", "club_savings_pct" : "0", "club_savings_amt" : "0.00", "discount_pct" : "10", "store_price" : "" } }

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