html{display:none} SEL-749M Motor Relay | Schweitzer Engineering Laboratories

SEL-749M

Motor Relay

SEL recommends selecting the SEL-710-5 Motor Protection Relay or the SEL-849 Motor Management Relay in place of the SEL-749M. The SEL-710-5 protects a full range of medium-voltage, three-phase induction and synchronous motors and is available with a color touchscreen display. The SEL-849 protects low- or medium-voltage three-phase induction and variable-frequency drive-fed motors and can be easily installed inside a motor control center.

SEL will continue to support and warranty the SEL-749M.

Generator and Motor Protection Comparison Chart

Starting At

$1,250 USD

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Low- and Medium-Voltage Motor Protection—Protect low- and medium-voltage induction and synchronous motors. The reliable and economical SEL-749M also protects three-phase motors, including two-speed and reduced-voltage start motors.

Extensive Communications and Software—Communicate seamlessly with built-in SEL ASCII and optional Modbus protocols. Quickly and easily set the SEL-749M with the included Microsoft Windows-based acSELerator QuickSet SEL-5030 Software. View start reports, motor trends, and real-time motor values with the complete meter and control features included in acSELerator Software.

Comprehensive Start Reports and Trends—Track motor performance during the critical starting period with complete motor start reports and 30-day average motor start trending. Only SEL offers this valuable tool for tracking motor performance.

Option Cards for Added Functionality—Customize the relay for your particular protection and control applications. Field-install option cards into the base relay to obtain voltage-based protection/control, increased digital I/O, and 4–20 mA analog output.

Features

    1. 1

      Front-panel EIA-232 serial port

    2. 2

      Default messages or up to 32 customizable display labels notify personnel of power system events or the relay status

    3. 3

      2 × 16 character LCD provides navigation, relay control, data, and diagnostics

    4. 4

      Programmable front-panel LEDs with user-configurable labels alert operators to faulted phases, the relay’s status, and element operation

    5. 5

      Six-button keypad enables simple navigation for settings, status, and access to event reports

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      Secondary input current: 1 A phase or 5 A phase or 1 A neutral or 5 A neutral

    2. 2

      3-phase ac voltage input; 300 Vac maximum

    3. 3

      Optional I/O expansion: three digital inputs, four digital outputs, one 4–20 mA output

    4. 4

      Optional communications card includes an EIA-485 port, an additional EIA-232 port, and the Modbus RTU protocol

    5. 5

      Port options include demodulated IRIG-B for precise-time input or a PTC input to thermally monitor protected equipment

    6. 6

      Power supply options include 125/250 Vdc/Vac or 24/48 Vdc/Vac. The relay also includes two digital inputs and three digital outputs.

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Details

True Temperature-Based Thermal Overload Protection
Eliminate false tripping, especially during cyclic overload operations. The release motor capability is unavailable with traditional overload relays.

Comprehensive Start Reports and Trends
Track motor performance during the critical starting period with complete motor start reports and 30-day average motor start trending. Only SEL offers this valuable tool for tracking motor performance.

Option Cards Add Functionality
Customize the relay to suit your particular protection and control applications with optional voltage, I/O, and communications cards.

Increase Operating Time by Using Complete Reporting
Troubleshoot motor/process problems using valuable, stored information about motors and processes from motor statistics, oscillograms, event reports, and sequential events records.

Extensive Communications and Software Capabilities
Communicate seamlessly with built-in SEL ASCII Fast Meter, Fast Operate, and Fast SER protocols, and EIA-232 as standard. Add optional Modbus protocol for connecting to your digital control system. Quickly and easily set the SEL-749M with the included Microsoft Windows-based acSELerator QuickSet SEL-5030 Software.

Compact, Ruggedized Hardware
Mount this UL/IEC short-mounting-depth relay in any motor control center.

  • Expandable I/O: Add programmable, interlocking monitoring and control with the I/O expansion card.
  • Voltage Inputs: Use voltage, power, and power factor protection and measurement with the optional voltage inputs card.
  • Communications options include a communications card with an EIA-485 port, an additional EIA-232 port, and Modbus RTU protocol.
  • External RTDs: 12 RTD inputs and one contact input on an SEL-2600A or SEL-2600D RTD Module mounted near a motor.
  • Projection Mounting Collars: A 45 mm collar and a 90 mm collar are available to mount the SEL-749M in locations with restricted depth clearance.
  • Wide Power Supply Range: Choose from 110–250 Vdc, 110–230 Vac, or 24–48 Vdc.
  • Digital input card to sense contact status of up to 8 inputs. 24, 48, 110, 125, 220, and 250 Vdc/Vac inputs available.
  • Conformal Coating: Protect equipment from harsh environments and airborne contaminants, such as hydrogen sulfide, chlorine, salt, and moisture.

Minimum QuickSet Version

Product Revision Z Number Minimum Software Version
SEL-749M R207 004 6.6.0.0
Please contact Application Engineer for firmware related to your hardware platform.  The current revision does not apply to all hardware.

Latest Firmware Versions

There are no firmware versions available for this product.

Product Revision Firmware ID Date Available Serial Number
SEL-749M R207-V3 SEL-749M-R207-V3-Z004005-D20201111 11/24/20 ~3203290001
SEL-749M R112-V1 SEL-749M-R112-V1-Z003004-D20150731 9/5/15 1152480001 or 3152480001
Please contact Application Engineer for firmware related to your hardware platform.  The current revision does not apply to all hardware.

The Firmware IDs for older versions of the firmware can typically be found in Appendix A of the instruction manual.

Minimum QuickSet Version

Product Revision Z Number Minimum Software Version
SEL-749M R207 004 6.6.0.0
Please contact Application Engineer for firmware related to your hardware platform.  The current revision does not apply to all hardware.

Product Certifications