Model: 850
Full Order Code: 850-E-P1-NN-S1-H-N-N-A-L-A-M-A-P-F-C-SE-N-N-B-N-1
Brand: GE Vernova (GE Multilin)
Series: Multilin 8 Series / 850 Feeder Protection System
Core Function: Advanced feeder protection, control, monitoring, and bay control relay. Provides primary or backup protection for medium-voltage underground and overhead feeders in industrial and utility applications. Combines protection, control, metering, and monitoring in a single device (“One Box Solution”).
HS Code: 8536.30 / 8537.10 (Electrical apparatus for switching or protecting electrical circuits)
Product Parameters
| Parameter | Specification |
|---|---|
| Product Type | Feeder Protection & Bay Control Relay |
| Application | Industrial / Distribution Feeder |
| Phase Current Inputs | 1 A three-phase (P1) |
| Ground Current Inputs | 1 A ground + 1 A sensitive ground (S1) |
| Power Supply | High Voltage: 110–250 Vdc / 110–230 Vac (H) |
| I/O Configuration | Configurable HV and LV I/O modules (specific slots per order code) |
| Display | Large color graphical display with configurable single-line diagram |
| Protection Functions | Comprehensive overcurrent (50/51/50N/51N/50G/51G/50SG etc.), directional, voltage, frequency, thermal, breaker failure, and advanced elements |
| Control Features | Breaker control, switchgear control elements, FlexLogic, synchrocheck, automatic bus transfer support |
| Monitoring | Advanced metering, fault/disturbance recording, breaker health, harmonics, demand |
| Communications | Multiple protocols including Modbus, DNP3, IEC 61850, IEC 60870-5-103/104, Ethernet options (exact options depend on final digits of order code) |
| Design | Draw-out |
| Environmental Coating | Harsh environment conformal coating (standard on 8 Series) |
| Mounting | Panel / rack mount |
Advantages and Features
- True “One Box Solution” combining protection, control, monitoring, and bay control
- Large color graphical display with configurable single-line diagrams and annunciator
- High-density I/O capability
- Advanced FlexLogic for custom protection and control schemes
- Excellent fault and disturbance recording for post-event analysis
- Strong cybersecurity features (supporting NERC CIP requirements)
- Draw-out design for easy testing and maintenance
- Supports both industrial and utility feeder applications
- 10-year warranty typical for Multilin 8 Series products
Application Cases in Application Fields
- Primary or backup protection of medium-voltage distribution feeders
- Industrial plant incoming and outgoing feeders
- Utility distribution substations
- Oil & gas, mining, metals, water/wastewater, and process industries
- Bay control applications requiring switchgear control and single-line visualization
- Automatic bus transfer and load shedding schemes
- Systems requiring advanced metering and asset monitoring
Comparisons with Competing Products
| Aspect | GE Multilin 850 | Previous Generation (e.g. 750) | Other Modern Feeder Relays |
|---|---|---|---|
| Display | Large color graphical + SLD | Basic LCD | Varies (many graphical) |
| Integration Level | High (Protection + Bay Control) | Medium | High |
| I/O Density | High | Medium | High |
| Cybersecurity | Advanced | Basic | Advanced |
| Draw-out Design | Yes | Yes | Common |
| Best For | Modern industrial & utility feeders | Legacy systems | General feeder protection |
Selection Suggestions and Precautions
Selection Suggestions:
- Confirm the exact order code matches the required CT ratios (1 A), ground sensitivity, power supply voltage, I/O needs, and communication protocols.
- Use the GE Multilin Online Store or configuration tool to verify or recreate the full order code.
- Consider the 850D version if dual-feeder protection is required.
- Evaluate communication requirements (IEC 61850, PRP, etc.) carefully for substation automation integration.
Precautions:
- This is a highly configured product — the exact hardware and firmware options are defined by the long order code. Always verify against the nameplate and GE documentation.
- Proper CT/VT sizing, polarity, and grounding are critical for correct protection operation.
- Commissioning should include thorough testing of protection elements, control logic, and communications.
- Follow GE Multilin guidelines for cybersecurity hardening when connecting to networks.
- Draw-out relays should be handled carefully during insertion/removal to avoid damage.
- Refer to the official Multilin 850 Instruction Manual for detailed settings, wiring, and application guidance.
Recent Popular Same-Brand / Related Models
- Multilin 850D — Dual feeder version
- Multilin 850P — Multi-feeder / padmount version
- Multilin 869 — Motor Protection
- Multilin 845 — Transformer Protection
- Multilin 889 — Generator Protection
- Other Multilin 8 Series relays
- Legacy migration options from Multilin 750/760 series
