B72220S0461K101 TVS Varistor, 460 V, 615 V, B722 Series, 1.24 kV, Disc 20mm. The Epcos B722 StandarD series are round shaped radial leaded, SIOV metal oxide varistors. These varistors have wide operating voltage range from 11VRMS to 1100VRMS. B722 series varistors are used as control or compensation elements in circuits either to provide optimal operating conditions or to protect against excessive transient voltages. The voltage dependent characteristics enable these varistors to protect against high transient voltage spikes.