Citel ds250vg 300 type 1 2 amp 3 ac surge protectors citel ds254vg 300g the citel ds254vg 300g is an extreme duty 4 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 ds254vg 300g ac surge protector type 1 2 3 230400v 3 phase n ct2