Metal oxide Varistors ( MOVs or VDRs ) are voltage dependent resistors with symmetrical voltage-current characteristics which are designed to protect all kinds of electronic devices or elements from switching pulse or induced lightening surges. Its non linear characteristic with broad application range, mass production feasibility are gradually being used in various level of electric and electronic device from low to high voltages level protections ( AC11V- 1000 V as available ranges ).

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