Ground Fault Protection Device

  • 150V version

  • 600V version

Ground Fault Protection Device

Morningstar’s Ground Fault Protection Device™ (GFPD) prevents current from following any unintended paths during a ground fault. Other ground fault detection/interruption products break the bond to the grounded conductor. When this occurs, not only is the earth bond compromised, but the battery and DC loads can also be left ungrounded and floating. For a negatively grounded system this means that the negative side of the battery and loads can float to negative Voc in relation to ground and the positive side can float to (negative Voc + Vbat). Morningstar’s GFPD better isolates the array from the battery and loads, while maintaining the bond to ground. Compatible with:

  • TriStar MPPT 600V
  • TriStar MPPT
  • ProStar MPPT

Key features and benefits

  • Disconnects both the positive and negative conductor and completely isolates PV source circuits
  • Trips at 300mA compared to 1A for alternative solutions
  • Provides design flexibility to accommodate large and small array
  • Uses high quality breaker solutions rather than fuses which are problematic
    to replace at remote sites
  • Works like a traditional AC GFI
  • Maintains the integrity of earth bond for battery and loads
  • Does not require an extra warning label at the battery per U.S. National
    Electric Code requirements
  • Makes it easier to locate and troubleshoot ground faults
  • Powered via the pv system’s battery
  • Equipped with both visual and audible alarms
  • Built to support both single controller and multiple controller systems
  • When the earth bond is not broken, Morningstar’s GFPD will only shut off
    affected controllers
  • All loads will continue to operate safely with the battery remaining bonded to
  • Multiple controllers and GFPDs can be added on an as-needed basis

Specifications and Certifications

Model GFPD-150V GFPD-600V
Maximum Solar Voltage (Voc) 150 volts 600 volts
Maximum Solar Current (Isc) 85A 50A
Nominal Battery Voltage 12, 24, 36 or 48 Vdc 12, 24, 36 or 48 Vdc
Supply Voltage Range 10-72 Vdc 10-72 Vdc
Self Consumption <0.5W <0.5W
Ground Fault Threshold Current 300 mA +/- 10% 300 mA +/- 10%
Number of Poles 2 2
Trip Method Relay Relay
Output Trip Signal 12V 12V
Operating Temperature Range -40 C to +50C -40 C to +60C
Warranty 5 Years 5 Years
CE and RoHS compliant Yes Yes
UL1741 and CSA C22.2 No. 107.1-01 Listed Yes Yes
UL-489 Listed Yes no
UL-1077 Listed no Yes
FCC Class B Part 15 Compliant Yes Yes
U.S. National Electrical Code (NEC) 690.5 Compliant for use as a GFPD device Yes Yes
Manufactured in a Certified ISO 9001 Facility Yes Yes


Download the Ground Fault Protection Device Datasheet.

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