Epoxy coated disc construction with radial leads.The Voltage Dependent Resistor is desinged to prrotect equipments against transient voltage spikes.Connected directly across the power supply rails, when a voltage spike is encounted, the varistor rapidly changes impedance from its normal high impedance state while in standby mode, to a very low level, permitting absorbtion of the unwanted high voltage and protecting voltage sensitive components and circuits from damage.