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CNR ~ VARISTOR, THERMISTOR, SURGE PROTECTOR DEVICE, GAS DISCHARGE

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1 .	Gas Discharge Tube GDT	RFQ
	Gas Discharge Tube are designed to limit voltage surges on balanced or unbalanced communications circuits and on DC to 420 Hz power circuits. Although telephone circuits are a major application for gas tube surge arrestors, this guide will also provide useful information for other surge applications such as AC circuits.
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2 .	Surge Protector Device SPD	RFQ
	Surge Protector Device(or surge suppressor) is an appliance designed to protect electrical devices from voltage spikes. A surge protector attempts to limit the voltage supplied to an electric device by either blocking or by shorting to ground any unwanted voltages above a safe threshold.The surge protection device (SPD) is used to describe electrical devices typically installed in power distribution panels, process control systems, communications systems, and other heavy-duty industrial systems, for the purpose of protecting against electrical surges and spikes, including those caused by lightning. Scaled-down versions of these devices are sometimes installed in residential service entrance electrical panels, to protect equipment in a household from similar hazards.
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3 .	METAL OXIDE VARISTOR (MOV, SURGE ABSORBER)	RFQ
	A varistor is an electronic component with a "diode-like" nonlinear current¨Cvoltage characteristic. The name is a portmanteau of variable resistor. Varistors are often used to protect circuits against excessive transient voltages by incorporating them into the circuit in such a way that, when triggered, they will shunt the current created by the high voltage away from sensitive components. A varistor is also known as voltage-dependent resistor (VDR). A varistor¡¯s function is to conduct significantly increased current when voltage is excessive.
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4 .	THERMISTOR	RFQ
	The Inrush Current Type NTCs --the NTC thermistor is a kind of semiconductor ceramic element that mostly made from transition metal oxide material, and belongs to negative temperature thermistor. It has a rated zero-power resistance, when in series in power loop, it can control the wave of current and make use of persistent function of the current, the NTC thermistor will be descended to very low degree, but the dissipation power of the NTC thermistor can be neglected. It is used for switch and control power, UPS power, protect all types of electron heater, electronic energy-saving lamp,electronic implement of scotch current and safeguard of power circuit, color kinescope, incandescence lamp, light of filament and so on. TYPE: NEGATVE TEMPERATURE COEFFICIENT, NTC THERMISTOR
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