Ground Fault Relay GFU20
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This unit has been known as the D64RPBH13 brand labelled for Eaton Corp. As of April 2023 we decided to sell this unit on this website as the GFU20.
The GFU20 is a ground fault protection unit for use on solidly grounded or resistance grounded systems. This innovative digital electronic unit measures ground fault current using the zero sequence Current Sensors series with a ratio of 10.000:1 or 500:1. The CS series sensors Go to Sensors. are connected to the Current Sensor's input terminals.
The system reacts to alternating current only and will reject direct current signals. It will maintain accuracy over a frequency range of 40 - 200 Hz, making it suitable for variable frequency drive applications.
The GFU20 houses an isolated universal power supply from 110 - 240 V AC or DC.
On a front accessible dipswitch array the Trip Delay Time (25 ms - 1 s, 14 steps), Ground Fault Trip Current level (2,5 A - 60 A with 500:1 ratio and 50 A - 1200 A with 10.000:1, both in 25 steps), Trip Inhibit mode (enabled/disabled) and the Relay Operating Mode (Non-Failsafe and Failsafe) can be set. The dipswitch array is made 'tamper proof', meaning that manipulating the switches will not change the settings, unless a special procedure is followed. If the procedure is not followed correctly the red and green LEDs will flash alternately, indicating an attempt to illegally change the settings. The original settings will stay valid until the entire procedure is followed.
This unit has been known as the D64RPBH13 brand labelled for Eaton Corp. As of April 2023 we decided to sell this unit on this website as the GFU20.
The GFU20 is suitable for use on Service Protection Equipment applications. It has an internal voltage-operated tripping device with an external toggle handle.
The GFU20 constantly supervises the connection to the external Current Sensor. Open and shorted wires are detected and, as it no longer protects the system, will cause a trip. Please note that the GFU20 does not employ any DC injection to implement this, since even small DC current sent through the secondary windings of a Current Sensor can bias its core enough to shift the trip point outside specification on sensitive settings. For the Current Sensor supervision to work a CS series sensor with a ratio of 10.000:1 or 500:1 must be installed, as specified in section 2.7 of the manual.
The cover mounted 'RESET' button can be pressed to reset a trip or double pressed to invoke a functional test of the GFU20, the red LED will signal 'TEST' with a solid indication in this situation. Provision is also made for an external test button to do a system test including the Current Sensor monitoring feature, the red LED will signal 'CS FAULT' by 4 consecutive flashes.
A green 'RUN' LED shows correct operation by slowly flashing (1 s on/ 1 s off). A red 'LAST TRIP' LED indicates that the GFU20 has sensed a fault and that the output contacts have operated. The blinking sequence of the red LED indicates the type of fault. When the Control Voltage to the GFU20 is removed, pressing the cover mounted reset button will show the green LED solidly on when no fault was detected before power-down. If a fault was present before power-down, the red LED will indicate the fault by the blinking sequence.
The Pull-apart terminal block simplifies connection of field wiring. It has two, 12 AWG screw clamps per pole with 90° and 270° orientations. Captive screws secure the blocks to the unit, safe from the effects of shock and vibration.
To ensure that the GFU20 will function in severe circumstances, it is encapsulated in polyurethane (PUR) to make sure it is not vulnerable to mechanical shock, vibration nor weather.
