SEI Power Products

Critical Power DC UPS
Founded in 1977, SEI manufactures DC (direct current output) critical power systems and customer-premises power equipment (CPE) for industrial users, wireless, telephone service providers, and the military. SEI is located in a 24,000 sq. ft modern manufacturing facility in Frederick, Maryland. SEI has shipped over 20,000 DC critical power systems to customers around the world. SEI products are proudly made in the USA.

SEI Products

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

Power Products

  • DC - uninterruptable power systems
  • PoE midspan - power over ethernet
  • ISDN products for digital Centrex customers
  • Power services