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SEL-749M

Motor Relay

Get comprehensive motor protection and SEL-exclusive reporting and trending that save you money in your industrial motor plant and processes. The SEL-749M Motor Relay uses the latest enhancements in the SEL-patented thermal overload model to accurately track the heating effects of operating and cyclic overload currents. The relay offers all basic motor protection features, including short-circuit, load loss, load jam, and frequent-starting protection as well as imbalance current and phase reversal protection. Add optional voltage, I/O, and communications capabilities to build the SEL-749M that is just right for your application.

Starting At

1,200 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 and DeviceNet 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.


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 or DeviceNet protocols 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 the a communications card with an EIA-485 port, an additional EIA-232 port, and Modbus RTU protocol; or a DeviceNet interface card.
  • 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.

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