1.4
SEL-749M Relay Instruction Manual Date Code 20080918
Introduction and Specifications
Applications
Accessories
Contact your Technical Service Center or the SEL factory for additional detail
and ordering information for the following accessories:
➤ The following devices are required to add RTD protection:
➢ An external SEL-2600 RTD module
➢ A simplex 62.5/125 µm fiber-optic cable with ST
connector for connecting the external RTD module to
the SEL-749M.
➤ SEL-749M Configurable Labels (Part #9260012)
➤ Rack-Mounting Kits:
➢ For one relay (Part #915900007)
➢ For two relays (Part #915900008)
➢ For one relay and a test switch (Part #915900009)
➤ Replacement Rear Connector Kits:
➢ Without retaining screws (Part #915900010)
➢ With retaining screws (Part #915900014)
➤ For information on additional SEL-749M mounting
accessories, including adapter plates, go to www.selinc.com/
Mounting Accessories/.
Applications
Section 2: Installation includes ac and dc connection diagrams for various
applications. The following is a list of possible application scenarios:
➤ With or without zero-sequence core balance current
transformer
➤ With or without external RTD module
➤ Across the line starting
➤ Star-delta starting
➤ Two-speed motors
Courtesy of NationalSwitchgear.com
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