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Multilin 850
Feeder Protection System
850 Feeder Protection System

The Multilin™ 850, a member of the Multilin 8 Series protective relay platform, has been designed for the management, protection and control of distribution feeder applications. The 850 is used to provide high performance primary or backup protection for underground and overhead medium voltage feeders used in industrial and distribution utility applications.

The 850 has been designed to provide advanced functionality including high performance protection, extensive programmable logic, flexible configuration, and detailed asset monitoring capabilities. With support for industry leading communications protocols and technologies, the 850 provides easy integration into new or existing SCADA or DCS for enhanced situational awareness.

Built from a rich history and legacy in providing advanced protection and control solutions and utilizing advanced design practices, superior technology, and state-of-the art test and manufacturing facilities, GE is redefining the industry standards for system performance, quality and reliability.

Redefining Industry Standards for Electrical System Performance and Reliability

The Multilin 850 redefines the standards for electrical system performance, quality and reliability. The Multilin 850 utilizes advanced design practices and superior technology, and provides enhanced quality, manufacturing, services and support processes. This allows the 850 to maximize system and process uptime, simplify system integration and extend asset life. The 850 comes with GE’s 10-year warranty.


The Multilin 850 delivers the highest level of quality, reliability and performance with…
Innovative Technology & Design
  • Elimination of electrolytic capacitors
  • Advanced diagnostics with unique algorithms ensuring asset protection is never compromised
  • Single set-up and configuration across the platform
  • Built-in field swappable power supply
  • Enhanced relay draw-out construction
  • Advanced and flexible communication offerings simplifying system integration
  • Embedded communications offerings including: IEC61850, IEC62439/PRP, Modbus RTU & TCP/IP
Exceptional Quality & Reliability
  • IPC A-610-E Class 3 Manufacturing standards – highest industry standards for electronic manufacturing
  • 100% Environmental Stress Screening and full functional testing
  • Rated for IP54 applications
Uncompromising Service & Support
  • Covered under GE’s 10 year warranty plan
  • Fully designed, tested and assembled at GE facilities
Key Benefits

The 850 is an advanced feeder protection relay that provides high performance protection, high density I/O, extensive programmable logic and flexible configuration capabilities. With protection and control logic, the 850 allows for simplified coordination with upstream and downstream disconnect devices.

Additional control features such as auto transfer schemes, load shedding, cold load pick up and auto-reclose are also available for the optimal protection and control of industrial and distribution networks.

This advanced protection relay also offers enhanced features such as diagnostics, preventative maintenance, condition monitoring, security, and advanced communication options.

Comprehensive feeder protection
  • Advanced breaker diagnostics with high-end fault and disturbance recording
  • High-end cyber security such as AAA, Radius, RBAC, and Syslog helps enable NERC® CIP requirements
  • Draw-out design simplifies testing, commissioning and maintenance, thereby increasing process uptime
  • Wi-Fi connectivity minimizes system configuration and provides safe relay programming and diagnostic retrieval
  • Relay environmental diagnostic information helps reduce system downtime
8 Series

From oil pumping and refining facilities, to open pit or underground mining and processing operations, companies demand solutions that ensure maximum process uptime, minimize operational and maintenance efforts, and have the durability to withstand harsh environmental conditions.

The Multilin 850 is GE’s next-generation protection and control relay designed for industrial and distribution utilities. It provides comprehensive protection and asset monitoring for critical feeders, motors, generators, and transformers.

With advanced communications, the Multilin 850 integrates easily and seamlessly into your new or existing control system, along with your other Multilin protection devices, providing a comprehensive solution for the end-to-end electrical system within your operations.

Oil & Gas / Petrochemical / Refineries
  • Protection and control for feeders and incomers
  • Fast bus transfer and high-speed interlocking schemes
  • Distribution load-shedding schemes

Mining & Metals
  • Primary or back-up protection for feeders and incomers
  • Fast, automatic bus transfer schemes
  • High-speed fault detection for arc flash mitigation

Distribution Utility
  • Protection and control for radial or looped distribution circuits
  • Autoreclosing control schemes
  • Distribution generation interconnect protection


The 850 provides advanced communications technologies for remote data and engineering access, making it easy and flexible to use and integrate into new and existing infrastructures.

Direct support for fiber optic Ethernet provides high-bandwidth communications allowing for low-latency controls and high-speed file transfers of relay fault and event record information. The 850 also supports two independent IP addresses providing high flexibility for the most challenging of communication networks.

Providing several Ethernet and serial port options and supporting the widest range of industry standard protocols, the 850 enables easy, direct integration into DCS and SCADA systems. The 850 supports the following protocols:

  • IEC 61850 Ed. 2, IEC 62439 / PRP
  • DNP 3.0 serial, DNP 3.0 TCP/IP, IEC 60870-5-103, IEC 60870-5-104
  • Modbus RTU, Modbus TCP/IP
8 Series
Integrated Arc Flash Protection

The Multilin 8 Series supports an integrated arc flash module providing constant monitoring of an arc flash condition within the switchgear, motor control control centers, or panelboards. With a 2ms protection pass, the 8 Series is able to detect light and overcurrent using 4 arc sensors connected to the 8 Series relay. In situations where an arc flash/fault does occur, the relay is able to quickly identify the fault and issue a trip command to the associated breaker thereby reducing the total incident energy and minimizing resulting equipment damage.

Self-monitoring and diagnostics of the sensors ensures the health of the sensors as well as the full length fiber cables. LEDs on the front panel display of the 845 can be configured to indicate the health of the sensors and its connections to the relay.

850 integrated arc flash protection
Fast, reliable arc flash protection with light-based arc flash sensors integrated within the Multilin 8 Series of protection & control devices. With arc flash detection in as fast as 2msec, the costs associated with equipment damage and unplanned downtime is significantly reduced.

By leveraging GE’s global research facilities located around the world, the Multilin 850 Feeder Protection Relay has integrated a number of advanced algorithms which allow for detailed diagnostic information. This allows users to make informed decisions based on real operational data.

Environmental Monitoring
In another first for the industry, the Multilin 850 implements an internal Environmental Monitoring system that measures and provides operating condition information. The 850 continuously monitors the temperature, humidity, voltage surges and vibration that the relay is exposed, enabling proactive decisions.

In addition, the Multilin 850 performs comprehensive device health diagnostic tests during startup and continuously at runtime to test its own major functions and critical hardware.

Built into the relay as a standard feature, the 850 includes high accuracy metering and recording for all AC signals. Current and voltage parameters are available as total RMS magnitude, and as fundamental frequency magnitude and angle. The 850 also measures up to the 25th harmonic on voltage and current, suitable for power quality applications.

8 Series
8 Series
Ease Of Use

Software and Configuration
The EnerVista™ suite is an industry leading set of software programs that simplifies every aspect of using the Multilin 850.

EnerVista provides all the tools to monitor the status of the protected asset, maintain the device and integrate information measured by the Multilin 8 Series, into SCADA or DCS process control systems. The ability to easily view sequence of events is an integral part of the setup software, as postmortem event analysis is critical to proper system management.

EnerVista Launchpad
The setup tools within Launchpad allow for the configuration of devices in real-time, by communicating via serial, Ethernet or modem connections, or offline, by creating device setting files to be sent to devices at a later time.

Setup with EnerVista Software
EnerVista setup software can reduce device setup and configuration time.The EnerVista™ suite is an industry leading set of software programs that simplifies every aspect of using the Multilin 850.

8 Series
8 Series Retrofit Kit

Explore the 8 Series Retrofit Kit

Retrofit Existing SR 750 Devices to the Multilin 850 in Minutes
Traditionally, retrofitting an existing relay has been a challenging, time consuming task often requiring re-engineering, new drawings, panel modifications, re-wiring and re-testing.

The 8 Series Retrofit Kit provides a quick, 3-step solution to upgrade previously installed SR 750 relays. With the new 8 Series Retrofit Kit users are able to install the 850 Feeder Management System without modifying existing cutouts and wiring, and without any drawing changes or re-engineering time.

Buy Retrofit Kit

Easy 3-Step Process to Upgrade in as Fast as 21 Minutes

EnerVista 8 Series Setup Software provides automated setting file conversion. Once completed, a graphical report is provided to verify and call out any specific settings that may need attention.

Simply remove the 4 existing terminal blocks and then remove the SR chassis from the panel. No need to disconnect any of the field wiring.

Insert the new 8 Series Retrofit chassis into the switchgear and simply plug-in the old terminal blocks - there is no need to make any cut-out modifications or push and pull cables.