Citel ds250vg 300 type 1 2 amp 3 ac surge protectors citel ds250vg 300 the citel ds250vg 300 is an extreme duty single pole type 123 ac surge protector device designed to give protection at the source of an electrical installation the spd is particularly useful in high lightning density areas where the risk of heavy surge current or even direct strike is high eg buildings equipped with lightning rods citel ds250vg 300 ac surge protector type 1 2 3 230400v single pole