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Varistors for surge-protective applications on systems with dc to 420 Hz frequency and voltages equal to or less than 1000 V rms, or 1200 V dc, are covered. Definitions, service conditions, and a series of test criteria for determining the electrical characteristics of the varistors are provided. The tests are intended as design tests and provide a means of comparing various surge-protective devices.

Varistors --- Transients (Electricity) --- Electric surge --- Electric transient phenomena --- Surge (Electricity) --- Electric apparatus and appliances --- Electric currents --- Electric waves --- Lightning --- Oscillators, Electric --- Diodes, Semiconductor --- Electric resistors --- Standards. --- Protection --- Electronic apparatus and appliances --- Thermal properties