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mk illumination electrical components are surge absorbers/varistor assemblies. Due to the nonlinear resistance change with respect to voltage, they exhibit symmetry in both directions (positive and reverse). They respond to abnormal voltages on the line, absorbing most of the surge energy while suppressing the abnormal voltage to a safe range, thereby improving line safety and stability. In the standby state, the surge absorber (varistor) has very high impedance (several megohms) relative to the protected electronic components and does not affect the characteristics of the original circuit design.