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. Motor Protection Features

Starting at

$1,820

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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.

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.

SEL-749M Features

Front-panel EIA-232 serial port
Default messages or up to 32 customizable display labels notify personnel of power system events or the relay status
2 × 16 character LCD provides navigation, relay control, data, and diagnostics
Programmable front-panel LEDs with user-conﬁgurable labels alert operators to faulted phases, the relay’s status, and element operation
Six-button keypad enables simple navigation for settings, status, and access to event reports

Secondary input current: 1 A phase or 5 A phase or 1 A neutral or 5 A neutral
3-phase ac voltage input; 300 Vac maximum
Optional I/O expansion: three digital inputs, four digital outputs, one 4–20 mA output
Optional communications card includes an EIA-485 port, an additional EIA-232 port, and the Modbus RTU protocol
Port options include demodulated IRIG-B for precise-time input or a PTC input to thermally monitor protected equipment
Power supply options include 125/250 Vdc/Vac or 24/48 Vdc/Vac. The relay also includes two digital inputs and three digital outputs.

SEL-749M Details

True Temperature-Based Thermal Overload Protection
Eliminate false tripping, especially during cyclic overload operations. 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. 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
Simplify troubleshooting 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.

749M#01

Price: $2,589.02 | Savings: $89.00

Low- and medium-voltage motor protection
Electromechanical relay retrofit

View configuration

Configuration

acSELerator QuickSet SEL-5030 Software

QuickSet is a tool for engineers and technicians to quickly and easily configure, commission, and manage power system devices. QuickSet includes a Graphical Logic Editor and a device template tool to reduce configuration time and streamline deployment. Learn more and download on the QuickSet software page.

Automated Data Collection

SEL Device Management and Automation (DMA) Application Suite

Available on the Blueframe platform, DMA applications automatically collect, store, and manage device-specific information like oscillography, Sequence of Events (SOE) data, device settings, and property information. They also provide automated password rotation and streamlined device audits. Learn more on the DMA software page.

Visualization and Analysis

SEL-5601-2 Synchrowave Event Software

Synchrowave Event helps engineers diagnose a protective relay’s behavior during a power system fault. It is a powerful and easy-to-use solution for displaying and analyzing SEL relay event reports and COMTRADE files. Learn more and download on the Synchrowave Event software page.