Citel ds230s 48dc pv network surge protector 30ka discharge current citel ds230s 48dc p citel ds230s 48dc surge protectors are designed to protect equipment connected to dc and photo voltaic pv power supplies from lightning surges p p they are based on varistors matched to the network voltage and have thermal disconnection devices to control any end of life a mechanical indicator on the unit shows when disconnection has occurred and a change over contact can be used for remote signalli