Contact SEI

Thank you for your interest in SEI’s line of DC-UPSs. For a quote, information, or a customized unit, please complete this form, call us at 301-694-9601 or email us at

Contact SEI

Contact Us

This information will remain private and will not be used for solicitation. 

ISDN Power Products and DC UPS Systems from SEI are available on our GSA Contract GS-35F-0487W

For order information or technical support call us at 301-694-9601 or email us using our Contact Us form

System Engineering International, Inc.

5115 Pegasus Court • Suite Q
Frederick, MD 21704

Voice: (301) 694-9601
Fax: (301) 694-9608