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High Voltage Surge Protection Varistor Metal Oxide Film Resistors D28

Categories Metal Oxide Varistor
Brand Name: YONGDE
Model Number: D28
Certification: ISO9001/KEMA
Place of Origin: Zhejiang,China(Mainland)
MOQ: 1pcs
Price: negotiation
Payment Terms: T/T or western Union or L/C or PayPal, MoneyGram, D/P, D/A
Supply Ability: 30,000pcs per month
Delivery Time: 20 working days after received your payment
Packaging Details: carton
genre: Metal Oxide Varistor
Use: Surge Arrester
Function: Protection
Diameter: 28mm
Color: Silvery gey
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    High Voltage Surge Protection Varistor Metal Oxide Film Resistors D28

    Lightning Arrester Metal Oxide Varistor of High Voltage


    Product Description:


    The Metal Oxide Film Resistor contains a ceramic mass of zinc oxide grains, in a matrix of other metal oxides (such as small amounts of bismuth, cobalt, manganese) sandwiched between two metal plates (the electrodes). The boundary between each grain and its neighbour forms a diode junction, which allows current to flow in only one direction.

    The mass of randomly oriented grains is electrically equivalent to a network of back-to-back diode pairs, each pair in parallel with many other pairs.[3] When a small or moderate voltage is applied across the electrodes, only a tiny current flows, caused by reverse leakage through the diode junctions. When a large voltage is applied, the diode junction breaks down due to a combination of thermionic emission and electron tunneling, and a large current flows. The result of this behaviour is a highly nonlinear current-voltage characteristic, in which the MOV has a high resistance at low voltages and a low resistance at high voltages.


    Specifications:


    D28 Metal Oxide Varistor(MOV):

    TypeD28 Metal Oxide Varistor(MOV)
    Specification mmD28*24
    Voltage Gradient V/mm210~235
    Square Wave Test Valve200
    4/20μ S High Current Withstand kA65
    8/20μ S high current withstand kA10
    DC1mA Refering Voltage kV5.3
    0.75Times U1mA Leak current μ A <10
    Residual Votage Ratio1.88
    Aging Load Point Ratio%85

    production-varistor35x4_02.jpgproduction-varistor31_02.jpg


    About us:


    Yongde holds the quality policy of being 'the technical forerunner, supreme in quality, supremacy of customers, and innovative progressing', so that our products and services successfully satisfied our users. We warmly welcome friends and customers from home and abroad to contact for exchanges and corporations. We also welcome feedbacks from our user communities.

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