Test Waveforms . While this specification does not uniquely define a transient test waveform, it is a useful baseline for comparison. This is the voltage just above the knee as shown in Figure 2. While the transition from one state to another is steep, it is continuous. Consequently, an arbitrary current of 1 mA is used as the transition point.
Manufacturers commonly list bounds on the varistor voltage.
It is important to note that the peak current and peak voltage may not be coincidental in time. This is the maximum continuous DC voltage that may be applied, within the working temperature range of the device. The leakage current is normally specified at the working voltage. This voltage is always less than the breakdown voltage of the device. This is the maximum peak current through the device at the rated voltage without causing device failure.