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GFA 300 Features

• 100 A - 1200A adjustable alarm level
• Adjustable time delay 40mS - 1 S
• No CTs
• Metering output
• Loss of ground connection alarm
• Vibration resistant
• UL approved

 

The GFA 300 is designed to provide ground fault protection or ground fault indication for generator systems in accordance with NEC Sections 700-26 and 700-7(d).

The GFA 300 has a unique measuring system that allows the user to detect ground fault current for any generator application.  The GFA 300 uses no C.T.s.  It is simply connected between the Generator-Neutral and the Generator-Ground. The unit’s sensing method measures total system ground fault current which flows from Generator-Neutral to Generator-Ground. The GFA 300 has an additional monitoring function.  It continuously monitors the neutral to ground connection and will alarm immediately if this connection is broken.

Prior to the introduction of the GFA 300, the only reliable way for conventional ground fault equipment to measure ground fault current on a generator required the use of a 4 pole transfer switch.  The open neutral pole of the 4 pole transfer switch allowed a clear path for the ground fault current to flow into.  For generators using 3 pole transfer switches, there is no clear path for the ground fault current to flow in.

• 3 Pole Automatic Transfer Switch  (ATS)
The GFA 300 is the only ground fault device that will measure ground fault current when using a 3 pole ATS.  Conventional ground fault equipment cannot distinguish between single phase loads, multiple fault paths and actual ground fault current.  The GFA 300 sees only the ground fault current.

• Paralleling Generators and Multiple Sources
The GFA 300 is the only ground fault device that will measure ground fault current when generators are installed in parallel or there are multiple power sources.  When a ground fault occurs under these circumstances, there will be multiple paths for the current to flow indifferent ground path resistances.  It is impossible to tell how the ground fault current will divide.  Conventional ground fault sensing equipment may or may not work.  The GFA 300 will always work.  It sees the ground fault current at all times which flows from Generator-Neutral to Generator-Ground.


Do you have a special application?

We can help.

Contact us by phone or fax: 972-370-0664

Legend
H1           LED green POWER ON
H2           LED red GROUND FAULT
H3           LED red LOSS OF GROUND CONNECTION
K1           Alarm relay
S1           Internal test button
S2           Internal reset button
S3           Ground fault current selector switch
R            Time delay potentiometer
%            1mA meter with 100% scale

Terminals
1-2          Input power supply DC 24 V
4-5          Link for manual reset
6             Ground connection
8             neutral connection
9-10        metering output
11-12      link for 4 pole ATS connection no link for 3 pole ATS connection 


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