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    SEL-849

    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

    699 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 128 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.

    Overview

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    Detachable HMI

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    Videos

    How to Install SEL-849 Motor Management Relay

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    How to Install SEL-849 Motor Management Relay

    How to Set The SEL-849 Motor Management Relay

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    How to Set The SEL-849 Motor Management Relay

    Reduce Arc-Flash Hazards

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    Reduce Arc-Flash Hazards

    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 128 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)

    Literature

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    Product Certifications

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