Drop Surge Protection DLPS-15D Solid state surge protector / ground block. SOLID STATE - DROP SURGE PROTECTION DLPS-15DP Solid state surge protector / ground block. Pass-through case DLPS-15C Solid state Surge protection Cylinder case DIU Series Digital Interface Unit Solid state surge protection / filter / DC (all in 1 case) GAS TUBE -  DROP SURGE PROTECTION DLPS-15G Gas tube surge protection / ground block DLPS-15GP Gas tube surge protection / ground block Pass - through case Solid state surge protection  incorporates a Sidactor device which triggers faster and has greater longterm durability than other solutions Gas tube surge suppression has greater initial current handling abilities and is a more economical solution than solid state The DIU incorporate solid sate surge s suppression with a choice o f filters,splitters and DCs