Model SPD surge protection devices are designed to protect sensitive electronic equipment from the harmful effects of transients and RFI/EMI interference. Models are configured for either parallel or series installation or can be din rail or wall mounted. Units are rated as Type 4 SPDs for application in Type 1-2 locations making the SPD Series suitable for incorporation into control cabinets to protect PLCs, irrigation systems, Alarm and Security systems, POS terminals, CNC Machinery, and most other sensitive microelectronic based equipment.