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Motor Management Relay

The SEL-849 Relay offers current-, voltage-, and thermal-based motor protection; arc-flash detection; and power metering. It also provides all basic motor protection features, including protection for the following conditions:

  • Short circuit
  • Load loss
  • Load jam
  • Frequent starting
  • Imbalanced current
  • Phase reversal

The SEL-849 installs easily inside a motor control center (MCC). The optional SEL-3421 and SEL-3422 Motor Relay HMIs (human-machine interfaces) install on the front of the MCC.

Starting At

$730 USD

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Motor Protection—Protect low- or medium-voltage three-phase induction and variable-frequency drive (VFD)-fed motors with an enhanced thermal model. Connect an external core-balanced current transformer (CBCT) to obtain sensitive ground-fault detection in high-impedance grounded systems.

Arc-Flash Mitigation—Improve worker safety using the SEL-849 Motor Management Relay’s built-in arc-flash detection (AFD). The AFD, supervised by overcurrent elements, delivers secure, reliable, and fast-acting arc-flash protection.

Feeder Protection—Configure flexible instantaneous and time overcurrent elements to protect feeder circuits.

Direct Connection—Connect up to 690 V to the optional voltage inputs and up to 256 FLA (full-load amperes) through the built-in CT primary circuits. Use external instrument transformers for higher voltages or currents.

Optional Human-Machine Interface (HMI)—Install SEL-849 Relays in motor control center (MCC) buckets, and connect the optional display modules (SEL-3421 or SEL-3422) outside the MCC for secure and safe relay access.

Metering and Monitoring—Analyze SER reports and oscillographic event reports for rapid commissioning, testing, and post-fault diagnostics. Reduce separately mounted metering/monitoring devices by taking advantage of the SEL-849 Relay’s motor start report, motor start trending, motor operating statistics, energy metering, minimum/maximum metering, and demand metering features.

Integration—Select from a variety of communications ports and protocols—IEC 61850, Modbus, SEL ASCII, and SNTP—to integrate SEL-849 Relays into supervisory or coordinated protection and control systems.

Multiple Applications—The SEL-849 Relay supports pumping applications for water, chemicals, and petroleum; air-based applications, including fans, blowers, air handlers, and compressors; chiller applications, such as compressors and air conditioning; and applications involving bulk materials, such as conveyors, crushers, screeners, feeders, augers, and bucket elevators. The SEL-849 can be configured as a motor, VFD motor, or feeder protection relay.

Low-voltage Feeder Protection—The SEL-849 includes a full set of instantaneous time and overcurrent elements that provide advanced low-voltage feeder protection:

  • Overcurrent
  • Voltage
  • Directional Power

Motor Control Centers (MCCs)—A primary application for the SEL-849 is for overload and arc-flash protection of MCCs. In this application, the SEL-849 operates the contactor, controlling the start and stop of the motor. The SEL-849 receives start/stop commands with IEC 61850 and Modbus protocols, contact inputs, or the remote HMI Start/Stop pushbuttons.

Detachable HMI



    1. 1

      EIA-232 or EIA-485 provides quick and easy engineering access.

    2. 2

      Optical sensor supports high-speed, secure arc-flash detection.

    3. 3

      You can use spacesaving portals for motor conductors with a fullload ampere (FLA) rating range of 0.5–256 A or external CTs for an FLA rating of up to 6,000 A.

    4. 4

      Optional direct-connect voltage inputs (allowing up to 690 Vac) enable voltage-based protection elements.

    5. 5

      HMI powered Ethernet port lets you review status and event records externally to improve safety

    6. 6

      EIA-232/EIA-485 serial or single/ dual Ethernet port(s), Modbus® RTU, Modbus TCP, and IEC 61850 provide flexibility to communicate with other devices and control systems.

    1. 1

      Large LCD display for navigation, relay control, and diagnostics

    2. 2

      Context-adjusted navigation keys

    3. 3

      Two fixed and eight programmable tricolored LEDs

    4. 4

      Fundamental motor controls

    1. 1

      Simple HMI for status and control

    2. 2

      Configurable label for programmable LEDs



Compact Design for Motor Control Centers (MCCs)
The compact form-factor 71.1 mm (2.8 in) X 127.0 mm (5 in) X 152.4 mm (6 in) easily installs in small MCC drawers and buckets. Built-in current transformers save room and reduce installation time.

Easy-to-Use Web Interface
The web interface makes it easy for electricians and technicians to configure and monitor the SEL-849.

Easy Integration With Control Systems
Several communications protocol options allow the SEL-849 to be used with old and new control systems. For maximum flexibility, the SEL-849 includes options for internally wetted or externally wetted contact inputs.

Arc-Flash Hazard Protection
MCCs typically have large fault-current potential, resulting in increased arc-flash hazards. The SEL-849 Relay’s arc-flash detection capability significantly reduces total arc-flash energy.

Standard Feature Set

  • EIA-232/EIA-485 port
  • Ethernet 10/100-BASE-T port
  • Remote HMI port
  • Three built-in window-type CTs
  • Standard current input, 0.5 to 256 A
  • Built-in arc-flash light sensor
  • Variable-frequency drive (VFD) support
  • Four contact outputs
  • Six optoisolated control inputs
  • Modbus RTU and Modbus TCP protocols

Rugged Hardware You Can Rely On
All SEL relays are designed to operate in harsh environments where other relays may fail. The SEL-849 operates in extreme conditions, with an operating temperature of –40° to +85°C, and is designed and tested to exceed applicable standards, including vibration, electromagnetic compatibility, and adverse environmental conditions.

  • Additional Ethernet port
  • IEC 61850
  • Additional EIA-232/EIA-485 communications port
  • Additional digital and analog I/O (6 DI/1 AO)
  • Externally wetted contact inputs (6 DI, or 6 DI/1 AO)
  • 690 V direct-connect voltage inputs and voltage-based protection elements
  • Conformal coating (optional in the SEL-849 and standard in the SEL-3421 and SEL-3422 HMI Modules)

Minimum QuickSet Version

Product Revision Z Number Minimum Software Version
SEL-849 R106-V2 003


How to Install SEL-849 Motor Management Relay

How to Set The SEL-849 Motor Management Relay

motorMAX Arc-Flash Protection

Latest Firmware Versions

There are no firmware versions available for this product.

Product Revision Firmware ID Date Available Serial Number
SEL-3421 R105-V0 SEL-3421-R105-V0-Z000000-D20160509 7/22/16 ~1162040001
SEL-3422 R105-V0 SEL-3421-R105-V0-Z000000-D20160509 7/22/16 ~1162040001
SEL-849 R107-V1 SEL-849-R107-V1-Z004002-D20190222 3/26/19 ~1190850001

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-849 R106-V2 003

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