APPLICATIONS: Techwin Industrial POE (Power over Ethernet) SPD (Surge Protection Device) is specially designed for Ethernet switches. The POE switch will not be damaged by lightning overvoltage, induced overvoltage, and electrostatic discharge. CAT5e and CAT5 compatible IEEE 802.3afï¼?803.1at 10/100 Base-T Ethernet protection LAN, FDDI, CDDI, ATM,WLAN PDH, SDH, SPDH Industrial control Industrial POE, With High reliability and high stability Surge protection for power supply system, SPD for low-voltage installations and device.CCTV system.