Description

GE Multilin 350-C-P5-G5-H-S-M-N-P-SN-D-N Feeder Protection Relay

The GE Multilin 350-C-P5-G5-H-S-M-N-P-SN-D-N, also cataloged as the 350 Feeder Protection Relay, operates as a dedicated hardware component for feeder protection, measurement, control, and communication tasks within GE Multilin 3 Series protection platforms.

Hardware Specifications

Parameter	Specification
Model	350-C-P5-G5-H-S-M-N-P-SN-D-N
Brand	GE Multilin
Origin	GE Multilin 3 Series platform
Power Consumption	Nominally < 10 W, maximum < 20 W
Product Type	Feeder Protection Relay
Power Supply	125 to 250 V DC / 100 to 240 V AC, 50/60 Hz
Phase Current Inputs	3-phase CT inputs, 5 A nominal
Ground Current Input	Ground CT input, 5 A nominal
Voltage Inputs	VT phase and bus inputs for voltage protection functions
Frequency Rating	50 Hz or 60 Hz systems
Current Withstand	20 x In for 1 second thermal withstand
Digital Inputs	8 contact inputs, dry or powered
Output Relays	7 output relays: 2 Form A and 5 Form C
Display Interface	Front LCD panel with target LEDs, menu keys, and USB configuration port
Enclosure Type	Drawout case with automatic CT shorting mechanism
Communication Ports	Front USB and rear RS485 serial port
Communication Protocols	Modbus RTU, DNP 3.0, IEC 60870-5-103

Profinet / EtherNet-IP Deterministic Networks and Industrial Protection Processing

The GE Multilin 350 relay uses a microprocessor-based protection architecture for continuous acquisition of feeder current, voltage, frequency, and status signals. The relay processes ANSI protection functions including 50P/51P phase overcurrent, 50G/51G ground overcurrent, 49 thermal overload, 46 negative sequence protection, 27/59 voltage elements, 67 directional elements, and 81 frequency protection.

The relay firmware manages deterministic protection logic execution, measurement calculations, event recording, and communication data exchange through the Multilin 3 Series hardware platform. The drawout construction supports removal and insertion of the protection unit while maintaining panel wiring through the integrated CT shorting mechanism.

Frequently Asked Questions

Q: Does the 350-C-P5-G5-H-S-M-N-P-SN-D-N support hot-swap operation?
A: The relay uses a drawout case design that allows insertion and removal from the chassis without disconnecting field wiring. CT shorting mechanisms are provided to maintain current transformer circuit protection during withdrawal.

Q: What communication interfaces are available on this relay?
A: The relay provides a front USB configuration interface and a rear RS485 serial communication port supporting Modbus RTU, DNP 3.0, and IEC 60870-5-103 protocols.

Q: What CT input ratings are supported by the P5 and G5 configurations?
A: The P5 phase current input and G5 ground current input configurations use 5 A nominal CT secondary inputs.

Field Installation Guidelines

• Install the relay in a compatible protection panel with appropriate mechanical support for the drawout chassis assembly.
• Verify CT polarity, phase sequence, and secondary wiring before energizing the protection circuit.
• Maintain separation between CT wiring, voltage sensing wiring, and communication cables to reduce electromagnetic interference.
• Connect RS485 communication wiring using shielded twisted pair cable with proper shield grounding practices according to site standards.
• Confirm auxiliary power supply voltage matches the 125 to 250 V DC or 100 to 240 V AC input range before startup.
• Use the front USB interface for configuration access while maintaining controlled access to protection settings and firmware data.
• Verify grounding continuity between relay enclosure, panel grounding system, and protective earth connection.

Specifications

• Brand: General Electric

Advantages

• High reliability in industrial environments
• Supports continuous operation
• Compatible with major PLC/DCS systems