GE350 Feeder Protection System

GENERAL SAFETY PRECAUTIONS - 350

• Failure to observe and follow the instructions provided in the equipment manual(s) 

could cause irreversible damage to the equipment and could lead to property 

damage, personal injury and/or death. 

• Before attempting to use the equipment, it is important that all danger and caution 

indicators are reviewed. 

• If the equipment is used in a manner not specified by the manufacturer or 

functions abnormally, proceed with caution. Otherwise, the protection provided by 

the equipment may be impaired and can result in Impaired operation and injury.

• Caution: Hazardous voltages can cause shock, burns or death.

• Installation/service personnel must be familiar with general device test practices, 

electrical awareness and safety precautions must be followed. 

• Before performing visual inspections, tests, or periodic maintenance on this device 

or associated circuits, isolate or disconnect all hazardous live circuits and sources 

of electric power. 

• Failure to shut equipment off prior to removing the power connections could 

expose you to dangerous voltages causing injury or death. 

• All recommended equipment that should be grounded and must have a reliable 

and un-compromised grounding path for safety purposes, protection against 

electromagnetic interference and proper device operation.

• Equipment grounds should be bonded together and connected to the facility’s 

main ground system for primary power.

• Keep all ground leads as short as possible. 

• At all times, equipment ground terminal must be grounded during device 

operation and service. 

• In addition to the safety precautions mentioned all electrical connections made 

must respect the applicable local jurisdiction electrical code.

• Before working on CTs, they must be short-circuited.

• LED transmitters are classified as IEC 60825-1 Accessible Emission Limit (AEL) Class 

1M. Class 1M devices are considered safe to the unaided eye. Do not view directly 

with optical instruments.

• This product uses optical electronic devices (line or point sensors) to sense arc 

flash fault conditions. It is recommended to follow proper housekeeping measures 

and establish a regularly scheduled preventive maintenance routine to ensure 

proper device operation.

• This product itself is not Personal Protective Equipment (PPE). However, it can be 

used in the computation of site-specific arc flash analysis when the arc flash 

option is ordered. If a new appropriate Hazard Reduction Category code for the 

installation is determined, the user should follow the cautions mentioned in the arc 

flash installation section.

• This guide is intended to provide protective relay application guidance to mitigate 

arc flash incident energy. This guide does not endorse energized work. This guide 

does not claim that protective relaying can totally protect personnel from the 

dangers of an arc flash. The only way to completely prevent injury from arc flash 

events is to de-energize the equipment and properly follow safe lockout/tagout 

procedures to ensure the equipment remains de-energized.

Safety words and definitions

The following symbols used in this document indicate the following conditions

Note Indicates a hazardous situation which, if not avoided, will result in death or serious 

injury.

Note Indicates a hazardous situation which, if not avoided, could result in death or serious 

injury.

Note Indicates a hazardous situation which, if not avoided, could result in minor or 

moderate injury.

Note Indicates practices not related to personal injury

Overview

The 350 is a microprocessor-based relay for primary and backup over-current protection 

of medium and low voltage distribution feeders. The relay is also suitable for providing 

over-current and backup protection for small and medium size motors, transformers, 

generators, and distribution bus-bars. The small footprint and the withdrawable option 

make the 350 relay ideal for panel mounting on either new or retrofit installations. The 

combination of proven hardware, a variety of protection and control features, and 

communications, makes the relay ideal for total feeder protection and control. Equipped 

with serial (RS485), USB, and Ethernet ports with the possibility of adding redundancy 

(IEC62439, PRP and HSR), and a wide selection of protocols such as Modbus, DNP3.0, IEC 

60870-5-103, 60870-5-104, IEC61850 GOOSE, OPC-UA, the 350 relay is the best-in-class 

for MCCs and PCCs, SCADA and inter-relay communications. The 350 relay provides 

excellent transparency with respect to power system conditions and events, through its 

four-line 20-character display, as well as the EnerVista 3 Series Setup program. 

Conveniently located LEDs provide indication of relay operation, alarm, and pickup, as well 

as breaker, and relay status.

The 350 relay provides the following key benefits:

• Withdrawable small footprint – saves on rewiring and space. (non-draw out version is