Founded in 1977, manufactures DC (direct current output) critical power systems and customer
premises power equipment (CPE) for industrial users, wireless, telephone service
providers, and the military. Our Service Division provides maintenance,installation and service for critical power systems. SEI is located in
24,000 square ft modern manufacturing facility in Frederick Maryland, SEI has shipped over 20,000 DC critical power systems.

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...
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