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23 Making the Right Surge-Suppression Technology Choices Type MOV Low cost and reliability make MOVs good for many general-purpose, high-voltage, or high-current applications that require fast response time: power supplies and power systems, line voltage protection, telecom systems, and appliances. They are best for applications that see short-duration overvoltage pulses. MOVs do not stand up well to sustained overvoltage. $ With the highest power-dissipation capabilities of available surge-suppression technologies, GDTs also have virtually no leakage current and low capacitance, but they are slow to respond to voltage spikes. GDTs are good for protecting large arrays of galvanically connected devices and other downstream surge-protection technologies. They are often installed externally to protect against lightning strikes, but they can also be made small for space-limited applications. GDTs are used to protect telecom customer premises equipment, industrial communications, and high-density PCB assemblies and are used in conjunction with other surge-suppression technologies. $$ GDT Applications Cost Table 3: Surge-Suppression Technology Types and Their Typical Applications TVS diode Fast response time and low to moderate capacitance make TVS diodes ideal for protecting high-speed data lines, low-voltage direct current (DC) applications, computers and peripherals, communication systems, audio and video equipment, portable instrumentation, and handheld portable devices. High-power versions are good for high-power DC bus protection. They have lower power dissipation capabilities than other surge-suppression technologies, and significant overcurrent conditions will destroy them. If they are used within their operational range, however, they should have a long life. $$$ This type combines the advantages of the high power dissipation and low leakage that GDTs provide with the fast response time of MOVs. Alternating current (AC) applications include AC line protection, appliances, power line communications, smoke alarm systems, high-value consumer goods, and industrial equipment. DC applications include DC line protection, solar inverters, power supplies and distribution systems, and high-efficiency power systems. $$$ GDT- MOV hybrid