Major Features and Benefits: –


The SEL-849 Motor Management Relay provides an exceptional combination of protection, metering, monitoring,

control, and communications in a compact industrial package. Built-in Rogowski coil-based window current transformers provide phase current measurement suitable for applications up to FLA=256 A. You can connect external CTs to accommodate full load amperes (FLA) greater than 256 A, and you can configure the device as a motor, variable frequency drive (VFD) motor, or feeder protection relay. Connect an external core balance current transformer (CBCT) to obtain sensitive ground-fault detection in a high-impedance grounded system.


Standard Motor Protection and Control Features. Protect low- or medium-voltage three-phase motors, as well as VFD fed motors, with an enhanced thermal model that includes locked rotor starts, time between starts, starts-per-hour, antibackspin timer, load loss, current unbalance, load jam/stalled rotor, phase reversal, breaker/contactor failure, positive temperature coefficient (PTC) thermistor over temperature, phase, negative-sequence, residual-ground instantaneous and inverse-time overcurrent elements, and an external CBCT for sensitive ground-fault protection. Implement load control, stardelta starting, two-speed control, forward-reverse start control, and such other control schemes as undervoltage automatic restarting.

Arc-Flash Protection. Use the SEL-849 with built-in fiber-optic arc-flash detector input to implement arc-flash protection. Settable arc-flash phase and residual overcurrent elements combined with the arcflash light-detection element provide secure, reliable, and fast-acting arc-flash event protection.


Optional Protection Features. Use the SEL-849 with voltage input option to provide over- and undervoltage,

over- and underfrequency, directional power, loss-of-potential, and power factor elements.

Operator Controls. Use a double-shielded, 600 V MCC-rated, SEL C627M Category 5e Ethernet cable, as long as 7.62 meters (25 feet), to connect the SEL-849 Relay to an optional SEL-3421 Motor Relay human-machine interface (HMI) or SEL-3422 Motor Relay HMI module. Both HMI modules provide eight user-programmable tricolor LED targets, two fixed targets, and motor control and function keys. The SEL-3421 Motor Relay HMI module also has a full graphical display with navigation and soft keys.

Integrated Web Server. Log on to the built-in web server to view metering and monitoring data and to

download events, Sequential Events Recorder (SER), motor start reports, etc. Use the server also to view, edit, and save relay settings or to perform relay firmware upgrades.

Relay and Logic Settings Software. ACSELERATOR QuickSet® SEL-5030 Software reduces engineering

costs for relay settings and logic programming and simplifies development of SELOGIC® control equations.

Metering and Monitoring. Use built-in metering functions to eliminate separately mounted metering

devices. Analyze SER reports and oscillographic event reports for rapid commissioning, testing, and post-fault diagnostics. Additional monitoring functions include the following:

➣ Motor start reports

➣ Motor start trending

➣ Load profile monitoring

➣ Motor operating statistics

➣ Demand metering

Direct Connect 690 Vac Voltage Inputs. Optional voltage inputs allow for wye-connected, open delta connected, or single voltage inputs to the relay. Use potential transformers to connect higher voltages.

Control Inputs and Outputs. Six or twelve (optional) internally wetted control inputs or six externally

wetted to 24/48 Vdc/Vac or 110/125 Vdc/Vac control inputs and four contact outputs (one Form C and three Form A) are for control and status indication.

Analog Output (Optional). Use an optional 0–20 mA programmable analog output to display any relay analog quantities on an external analog meter.

Communications Ports.

➣ Port 1 and an optional Port 3, EIA-232 or EIA-485 configurable serial ports

➣ Port 2 single or dual (optional) 10/100BASE-T Ethernet port(s)

➣ HMI Ethernet Port

Communications Protocols.

➣ Modbus® RTU, Modbus TCP/IP

➣ IEC 61850 (optional Ethernet-based protocol)

➣ Simple Network Time Protocol (SNTP)

➣ File Transfer Protocol (FTP)

➣ Telnet (SEL ASCII)

➣ SEL protocols

IEC 60947-4-1 Type 2 Coordination Compatible. For short circuits, the relay withstands as much as

100 kA.

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