We build DC uninterruptible power systems (UPS) that provide 48 Vdc and 24 Vdc battery backed-up power. These 'power plants in a box' systems have power distribution modules and options that facilitate use in a wide variety of applications. Batteries provide holdover time from 20 minutes to 8 hours. Find out more about SEI's DC UPS's...

SEI also builds ISDN powering systems and Network Termination Units (NT1's). These provide power and computer interfaces for Digital Centrex, which employ ISDN as its protocol. SEI is the largest supplier of these products. Find out more about SEI's line of ISDN products...

Our Power over the Ethernet (PoE) midspan injectors provide power over the Ethernet for IP telephones and devices that require power to be delivered through the LAN. Find out more about SEI's Ethernet power solutions...

SEI's Power Services Division installs, services, and maintains AC and DC critical power systems. Our customers include long distance, local exchange, cable and interconnect carriers, as well as Government and Fortune 500 enterprise users. Find out more about SEI's Power Services...