Sign In | Join Free | My
China Hangzhou Yongde Electric Appliances Co.,Ltd logo
Hangzhou Yongde Electric Appliances Co.,Ltd
Superior Quality, Superior Service!
Verified Supplier

5 Years

Home > Metal Oxide Varistor >

High Energy Metal Oxide Varistor MOV Surge Protection With KEMA Type

High Energy Metal Oxide Varistor MOV Surge Protection With KEMA Type

Brand Name : YONGDE

Model Number : D35

Certification : ISO9001/KEMA

Place of Origin : Zhejiang,China(Mainland)

MOQ : 1pcs

Price : good price

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 : MOV

Usage : Surge Arrester

Function : Protection

Φ : 35mm

Color : Silvery gey

quality : high

Contact Now

D35 Metal Oxide Zinc Varistor Disc with KEMA Type Test Report

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.

A varistor remains non-conductive as a shunt-mode device during normal operation when the voltage across it remains well below its "clamping voltage", thus varistors are typically used for suppressing line voltage surges. However, a varistor may not be able to successfully limit a very large surge from an event like a lightningstrike where the energy involved is many orders of magnitude greater than it can handle. Follow-through current resulting from a strike may generate excessive current that completely destroys the varistor. Lesser surges still degrade it, however. Degradation is defined by manufacturer's life-expectancy charts that relate current, time and number of transient pulses. The main parameter affecting varistor life expectancy is its energy (Joule) rating. As the energy rating increases, its life expectancy typically increases exponentially, the number of transient pulses that it can accommodate increases and the "clamping voltage" it provides during each transient decreases. The probability of catastrophic failure can be reduced by increasing the rating, either by using a single varistor of higher rating or by connecting more devices in parallel. A varistor is typically deemed to be fully degraded when its "clamping voltage" has changed by 10%. In this condition it is not visibly damaged and it remains functional (no catastrophic failure).

The parameter of MOV:

Metal Oxide Film Resistor technical parameter



Product Tags:

zinc oxide varistor


high voltage varistor

China High Energy Metal Oxide Varistor MOV Surge Protection With KEMA Type wholesale

High Energy Metal Oxide Varistor MOV Surge Protection With KEMA Type Images

Inquiry Cart 0
Send your message to this supplier
*To: Hangzhou Yongde Electric Appliances Co.,Ltd
Characters Remaining: (0/3000)

Home| Products| Suppliers| Quality Suppliers| Site Map |About Us |Contact Us |Help |关于我们 |联系我们

Copyright © 2009 - 2020 All rights reserved.