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Protection & Control

Home > Automation & Protection > Protection & Control > Feeder Protection > 8 Series

Multilin 8 Series
Innovative protection and control relay platform

The Multilin™ 8 Series platform of advanced protection and control relays delivers high quality and performance management, protection and control for transformer, generator, motor and feeder applications.

Comprised of the 845 transformer protection relays, 889 generator protection relays, 869 motor protection relays and 850 feeder protection relays, the 8 Series platform features innovative technology and design, as well as uncompromising service and support.

With support for industry leading communications protocols and technologies, the Multilin 8 Series platform provides easy integration into new or existing SCADA or DCS for enhanced situational awareness.

GE Advantage
Platform Overview
Monitoring & Diagnostics
Communications & Cyber Security
Multilin 8 series product explorer

Platform Overview

The Multilin 8 Series platform delivers the highest level of quality, reliability and performance with…

Innovative Technology & Design

  • Patented environmental monitoring and diagnostics helps visibility on change in environmental parameters
  • Advanced, flexible and embedded communications: IEC® 61850 Ed2, IEC 62439/PRP, Modbus® RTU & TCP/IP, DNP3.0, IEC 60870-5-104, IEC 60870-5-103
  • Single setup and configuration across the platform
  • Field swappable power supply
  • Draw-out design simplifies testing, commissioning and maintenance, thereby increasing process uptime
  • Optional Wi-Fi connectivity minimizes system configuration and provides safe relay programming and diagnostic retrieval
  • Elimination of electrolytic capacitors

Exceptional Quality & Reliability

  • IPC A-610-E Class 3 Manufacturing standards – highest industry standards for electronic manufacturing
  • Highest reliability standards for electronics testing
  • Environmental Stress Screening and full functional testing
  • Rated for IP54 applications
  • Standard Harsh Conformal Coating

Uncompromising Service & Support

  • Covered under GE’s 10 year warranty plan
  • Fully designed, tested and assembled at GE facilities
8 series exploded view

Multilin 8 Series Platform Application Examples

Multilin 8 Series Platform Application Examples

Monitoring & Diagnostics

The Multilin 8 Series platform features a number of robust capabilities for motor, transformer, generator and feeder monitoring and diagnostics.

869 Motor Monitoring & Diagnostics

Motor Monitoring & Diagnostics

Integrated, cost effective motor monitoring and diagnostics are available in the Multilin 869 motor protection relay. Existing relay data is leveraged to detect electrical, thermal or mechanical abnormalities before they become critical motor failures. Motor monitoring and diagnostic capabilities include:

  • Advanced monitoring and trending for condition-based status of electrical conditions that can affect motor performance
  • Continuous, proactive monitoring of thermal capacity used for early identification of thermal stresses
  • Electrical signal analysis and motor current signature analysis to identify common mechanical abnormalities
845 Transformer Monitoring & Diagnostics

Transformer Monitoring & Diagnostics

Integrated electrical and dissolved gas analysis (DGA) for comprehensive transformer monitoring and diagnostics is available with the Multilin 845 transformer protection relay. The 845 provides advanced notification of potential issues before they become critical, and features detailed learned data, summarized pre/post-fault records, and integration with GE’s DGA devices to collect, trend, and analyze a transformer’s fault gases. This enables operators to minimize costly unplanned outages and equipment failures.

889 Generator Monitoring & Diagnostics

Generator Monitoring & Diagnostics

The Multilin 889 generator protection relay provides comprehensive generator monitoring and diagnostics, including a generator health report that provides an easy-to-read snapshot of a generator's health and operating condition. Based on graphical representation and trend values of the generator historical data, the 889 enables operators and asset managers to identify process issues and maintenance requirements before damage occurs and costly repairs are required.

850 Feeder Monitoring & Diagnostics

Feeder Monitoring & Diagnostics

Feeder and breaker health monitoring and diagnostics are available in the Multilin 850 feeder protection relay. The 850 provides high accuracy metering and recording for all AC signals. Voltage, current, and power metering are built into the relay as a standard feature. Current and voltage parameters are available as total RMS magnitude, and as fundamental frequency magnitude and angle. The 850 also delivers comprehensive data logging, trip and close circuit monitoring elements, and a breaker arcing current element.


The 8 Series 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 copper/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 8 Series 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 8 Series enables easy, direct integration into DCS and SCADA systems. The 8 Series supports the following protocols:

  • IEC 61850 (8 Clients, 4 Logical Devices, Tx & Rx expansion, Analog GOOSE), 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

The 8 Series has two interfaces as USB front port and Wi-Fi for ease of access to the relay.

  • Simplify set-up and configuration
  • Simplify diagnostic retrieval
  • Eliminate personnel in front of switchgear
  • WPA-2 security
8 series communications

Cyber Security

The Multilin 8 Series platform relays feature cyber security capabilities that enable the devices to deliver full cyber security data classification by security level using statures that help operators to comply with NERC CIP guidelines and regulations.

AAA Server Support (Radius/LDAP)

Enables integration with centrally managed authentication and accounting of all user activities and uses modern industry best practices and standards that meet and exceed NERC CIP requirements for authentication and password management.

Role Based Access Control (RBAC)

Efficiently administrate users and roles within UR devices. The new and advanced access functions allow users to configure up to five roles for up to eight configurable users with independent passwords. The standard “Remote Authentication Dial In User Service” (Radius) is used for authentication.

Event Recorder (Syslog for SEM)

Capture all cyber security related events within a SOE element (login, logout, invalid password attempts, remote/local access, user in session, settings change, FW update, etc), in standard Syslog data format. This will enable integration with established SEM (Security Event Management) systems.

8 series cyber security

Software & Configuration

The EnerVista™ suite is an industry-leading set of software programs that simplifies every aspect of using the Multilin 8 Series relays. EnerVista provides all the tools to monitor the status of the protected asset, maintain the device and integrate the 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.

The setup tools within EnerVista 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.

Learn more about EnerVista Software.

8 Series Setup Software

8 Series Setup Software is single setup and configuration tool across the platform and can reduce device setup and configuration time.

850 set up

Simplified Setup & On-Going Maintenance