Date Code 20090715 User’s Guide SEL-421 Relay
© 2001–2009 by Schweitzer Engineering Laboratories, Inc. All rights reserved.
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trademarks may be used without written permission. SEL products appearing in this document may be covered by US and Foreign patents.
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its products, including without limitation software, firmware, and documentation.
The information in this manual is provided for informational use only and is subject to change without notice. Schweitzer Engineering
Laboratories, Inc. has approved only the English language manual.
This product is covered by the standard SEL 10-year warranty. For warranty details, visit www.selinc.com or contact your customer service
representative. PM421-01
Courtesy of NationalSwitchgear.com
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