GE 350-C-P5-G5-H-E-M-N-P-SN-D-N (Industrial-Grade Feeder Protection System)

The GE 350-C-P5-G5-H-E-M-N-P-SN-D-N represents a proven solution for feeder circuit protection in demanding utility and industrial environments. This Multilin-engineered relay integrates overcurrent detection, voltage monitoring, and frequency supervision into a single panel-mounted device, reducing installation complexity while maintaining protection integrity.

Designed for electrical engineers managing medium-voltage distribution networks, this relay addresses the critical challenge of coordinating protection across multiple feeder circuits. Whether you're upgrading aging electromechanical relays or standardizing protection across a multi-site facility, the 350 series delivers consistent performance with field-proven reliability spanning decades of utility deployment.

Key differentiators include multi-protocol communication capability (Modbus RTU, DNP3.0, IEC 61850), comprehensive event logging for regulatory compliance, and a wide operating temperature range (-40°C to +70°C) that eliminates the need for climate-controlled enclosures in most installations.

Core Protection Functions & Business Value

→ Phase & Ground Fault Detection (ANSI 50/51, 50N/51N)
Time-overcurrent and instantaneous overcurrent elements protect against phase-to-phase and ground faults. Reduces equipment damage costs by isolating faults within 50-100ms, preventing cascading failures that can result in $50K+ downtime events in industrial facilities.

→ Voltage Anomaly Protection (ANSI 27/59)
Undervoltage and overvoltage supervision safeguards sensitive loads from voltage sags and surges. Particularly valuable in facilities with variable renewable energy sources or unstable grid connections, preventing premature motor and drive failures.

→ Frequency Deviation Monitoring (ANSI 81O/U)
Over/under frequency detection enables load shedding schemes and islanding protection for distributed generation. Essential for microgrids and facilities with on-site generation to maintain IEEE 1547 compliance.

✓ Automatic Reclosing Logic (ANSI 79)
Programmable reclosing sequences restore service after transient faults, improving system availability from typical 99.5% to 99.9%+ in overhead distribution applications. Configurable dead times and shot sequences adapt to your specific coordination requirements.

✓ Integrated Metering & Power Quality Analysis
Real-time measurement of voltage, current, power (kW/kVAR/kVA), energy (kWh), power factor, and harmonics eliminates the need for separate metering devices. Supports demand response programs and energy cost allocation across departments or tenants.

✓ Multi-Protocol SCADA Integration
Native support for Modbus RTU, DNP3.0, and IEC 61850 protocols ensures compatibility with legacy and modern control systems. Reduces integration costs by 40-60% compared to protocol converter-based solutions, while enabling remote monitoring that cuts site visit requirements by 70%.

Application Scenarios Across Industries

Utility Substation Feeders
Electric utilities deploy the GE 350-C in distribution substations to protect 4.16kV to 34.5kV feeders serving residential and commercial loads. The relay's directional overcurrent capability and zone-selective interlocking minimize outage scope during fault conditions. Typical installations protect 5-15 MVA feeders with coordination time intervals of 0.3-0.5 seconds between upstream and downstream devices.

Manufacturing Facility Distribution
Industrial plants use this relay to protect main and tie feeders in medium-voltage switchgear lineups. The event recorder captures pre-fault and post-fault data for root cause analysis, reducing repeat failure rates by 35%. Integration with building management systems enables predictive maintenance alerts when load trends indicate developing issues.

Data Center Critical Power Paths
Mission-critical facilities require sub-cycle fault clearing to prevent IT equipment damage. The 350-C's instantaneous overcurrent elements operate in 16-50ms, coordinating with downstream molded-case breakers while maintaining selectivity. Dual communication paths (front RS-485 and rear Ethernet option) provide redundant monitoring for Tier III/IV uptime requirements.

Renewable Energy Collection Systems
Solar farms and wind installations utilize these relays for collector feeder protection, with anti-islanding detection meeting IEEE 1547 and UL 1741 requirements. The frequency and voltage elements detect grid separation conditions within 2 seconds, ensuring worker safety during maintenance and preventing equipment damage from out-of-phase reclosing.

Commercial Building Main Distribution
Hospitals, airports, and high-rise buildings deploy the 350-C to protect 480V-15kV main and sub-feeders. Arc flash reduction schemes using the relay's high-speed tripping capability can reduce incident energy levels from 40+ cal/cm² to <8 cal/cm², lowering PPE requirements and improving maintenance safety.

Technical Parameters & Selection Criteria

Selection Guidance: For feeders <5 MVA with basic protection needs, the 350 series offers optimal cost-performance. Applications requiring advanced features like synchrophasor measurement, arc flash detection, or >12 protection elements should consider the SR750 or UR series platforms. Confirm CT and PT ratios match existing infrastructure to avoid costly field modifications.

Advanced Integration Capabilities

SCADA & Substation Automation
The relay's DNP3.0 Level 2 implementation supports unsolicited responses and time synchronization, enabling real-time data acquisition at 1-second intervals. IEC 61850 Edition 1 compliance (with optional Ethernet module) provides GOOSE messaging for peer-to-peer interlocking and sampled values for process bus architectures. Typical SCADA point counts: 40-60 analog values, 30-50 status points, 15-20 control points.

Cybersecurity Features
Role-based access control with three user levels (view, control, configure) prevents unauthorized setting changes. Front panel lockout and password protection meet NERC CIP compliance requirements for critical infrastructure protection. Event logs track all configuration changes with timestamp and user ID for audit trails.

Custom Logic Programming
Built-in FlexLogic™ engine allows creation of custom protection and control schemes using Boolean logic equations. Common applications include breaker failure protection, load shedding sequences, and automatic transfer schemes. Up to 128 logic variables and 64 timers enable complex automation without external PLCs.

Delivery, Warranty & Technical Support

Lead Times:
• Stock configurations (standard voltage/current ratings): 3-5 business days to ship
• Custom configurations or large quantities (>10 units): 2-3 weeks
• Expedited processing available for critical outage situations

Warranty Coverage:
12-month comprehensive warranty covering manufacturing defects, component failures, and workmanship issues. Warranty includes firmware updates and technical support. Extended warranty options available for mission-critical applications.

Technical Resources Included:
• Complete instruction manual with protection setting guidelines
• EnerVista 350 Setup software (Windows-based configuration tool)
• CAD drawings for panel cutout and wiring diagrams
• Sample Modbus/DNP3 register maps for SCADA integration
• Protection coordination curves in IEEE/IEC format

Application Engineering Support:
Our team provides pre-sale consultation on protection coordination, CT/PT sizing, and communication architecture design. Post-sale support includes setting file review, commissioning assistance, and troubleshooting. Average response time: <4 hours for technical inquiries.

Frequently Asked Questions

How does the GE 350-C compare to electromechanical relays for feeder protection applications?
The 350-C provides 10-15 protection functions versus 1-2 for electromechanical devices, reducing panel space by 60-70% and wiring labor by 40%. Digital relays offer superior accuracy (±2% vs ±5-10%), self-diagnostics, and remote monitoring capabilities that lower lifecycle costs by 30-50% despite higher initial investment.

Can this relay interface with existing Modbus RTU SCADA systems without protocol converters?
Yes, the 350-C includes native Modbus RTU (RS-485) at baud rates from 300 to 19,200 bps. It supports both master and slave modes with configurable register mapping. No external gateways required, reducing system complexity and potential failure points.

What current transformer accuracy class is required for proper relay operation?
Minimum CT accuracy class C100 (IEEE) or 5P20 (IEC) recommended for protection applications. For metering accuracy, use 0.3 or 0.6 class CTs. The relay's wide dynamic range (0.1-46× In) accommodates CT saturation during high-magnitude faults while maintaining protection integrity.

Is firmware upgradeable in the field to add new protection features?
Yes, firmware updates install via the front RS-232 port or rear RS-485 port using EnerVista software. Typical update time: 5-10 minutes. Settings files export/import for backup and multi-relay standardization. Always verify compatibility between firmware versions and existing setting files before upgrading.

What environmental conditions require special consideration during installation?
While the relay operates across -40°C to +70°C, installations in high-humidity coastal environments should use conformal-coated circuit boards (specify at order). Locations with sustained temperatures >60°C benefit from forced ventilation. Altitude >2000m may require derating of contact outputs per IEC 60255-27.

How many feeder relays can connect to a single SCADA master on one RS-485 network?
Typical RS-485 networks support 32-64 devices depending on cable length and baud rate. For the 350-C, we recommend maximum 32 relays per segment at 9600 bps with <4000 feet total cable length. Use repeaters or Ethernet switches for larger installations to maintain response times <1 second.

Order Your GE 350-C Feeder Protection Relay Today

Protect your critical electrical infrastructure with proven Multilin technology trusted by utilities and industries worldwide. Every GE 350-C-P5-G5-H-E-M-N-P-SN-D-N relay ships with factory calibration certificates, comprehensive documentation, and our commitment to technical excellence.

Ready to upgrade your feeder protection? Contact our application engineers for protection coordination studies, setting file development, or volume pricing. We support your project from specification through commissioning and beyond.

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