849#01
Price: $1,239.24 | Savings: $40.00
- Low- and medium-voltage three-phase motor protection
- Overload and solid-state motor relay replacement
- Basic I/O hardware for simple integration
SEL-849
Motor Management Relay
The SEL-849 is a versatile product suited for both industrial and utility applications. It offers current-, voltage-, and thermal-based motor protection; current- and voltage-based feeder protection; arc-flash detection; and power metering. The SEL-849 installs easily inside a motor control center (MCC) bucket or a control panel. The optional SEL-3421 and SEL-3422 Motor Relay HMIs allow for simple remote communications.
Starting at
$1,050
Motor Protection
The SEL‑849 provides all basic motor protection features, including protection for short-circuit, load loss, load jam, frequent-starting, unbalanced current, and phase reversal conditions. 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.
Feeder Protection
Configure flexible instantaneous and time overcurrent elements (e.g., overcurrent, voltage, directional power) to protect low-voltage feeder circuits.
Second- and Fifth-Harmonic Blocking Logic
When multiple transformers are energized concurrently, it can be difficult for relays to distinguish between the magnetizing inrush current and fault current. Second- and fifth-harmonic blocking logic provides the capability to recognize inrush current and block overcurrent element operation.
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.
Arc-Flash Mitigation
Improve worker safety using the relay’s built-in arc-flash detection (AFD). The AFD, supervised by overcurrent elements, delivers secure, reliable, and fast-acting arc-flash protection.
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 HMIs
Integration
Select from a variety of communications ports and protocols—IEC 61850 Edition 1, Modbus TCP/IP, Modbus RTU, EtherNet/IP, the IEC 62439 Parallel Redundancy Protocol (PRP), DNP3, SEL ASCII, and SNTP—to integrate SEL‑849 relays into supervisory or coordinated protection and control systems.
Easier Testing, Commissioning, and Maintenance
The SEL‑3421 allows you to perform key maintenance and operational tasks without plugging in a computer. The ability to view and set the IP and router address directly from the HMI screen makes relay installation easier. The HMI navigation keys can be programmed as pushbuttons to perform functions such as triggering reports or resetting values, making commissioning, maintenance, and day-to-day operation easier.
SEL-849 Features
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- EIA-232 or EIA-485 provides quick and easy engineering access.
- Optical sensor supports high-speed, secure arc-flash detection.
- You can use space-saving portals for motor conductors with a full-load ampere (FLA) rating range of 0.5–256 A or external CTs for an FLA rating of up to 6,000 A.
- Optional direct-connect voltage inputs (allowing up to 690 Vac) enable voltage-based protection elements.
- HMI powered Ethernet port lets you review status and event records externally to improve safety
- A wide variety of communications protocols and media provide flexibility to communicate with other devices and control systems.
- Power supply options include 110–240 Vac, 125–250 Vdc; or 24–48 Vdc.
- Connectors for the thermistor input and AO let you monitor the equipment temperature and integrate with a distributed control system (DCS).
- Connectors for DIs and DOs provide a convenient way to issue control signals and monitor equipment.
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- Large LCD display for navigation, relay control, and diagnostics
- Context-adjusted navigation keys can be programmed to function as pushbuttons.
- Two fixed and eight programmable tricolored LEDs
- Fundamental motor controls
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- Simple HMI for status and control
- Configurable label for programmable LEDs