Ultraflex Group

GFPD - Ground Fault Protection

GFPD - Ground Fault Protection Charge controllers Electrical equipments

GFPD - Ground Fault Protection


Morningstar’s Ground Fault Protection Device (GFPD) is an innovation for ground fault detection and interruption for the photovoltaic (PV) industry.
It has greater sensitivity and better isolation while maintaining the bond to earth ground. Ground fault protection is used in electrical systems to prevent current from following any unintended paths during a ground fault.


• Simple and Flexible Installation: side or below flush mounting with coupling hardware included. Includes fused battery cable for power. Compatible with other supplier’s PV controllers and inverters. For positive or negative grounded PV systems

• Greater Sensitivity: more precise than fused ground fault protection, it activates starting at 300mA compared to 1A for alternative solutions

• Mantains the bond to earth ground: normally grounded components (conductors, controller, battery and DC loads) will not be left floating

• No fuses: avoids problematic replacements of fuses, which are often unavailable at remote sites. Uses high quality breaker switches that continue to operate after ground fault interruptions

• Safety features: breaks the connection to the PV array during a fault condition. It leaves the battery and DC loads grounded under all conditions. Alternative ground fault solutions require a warning label on the battery to note that dangerous voltage are present

• Better isolation: disconnects both the positive and negative conductor. Completely isolates the ground fault the controller, battery and loads

• Supports both single controller and multiple controller systems: will only shut off affected controllers while maintaining the system earth bond. All loads will continue to operate safely with the battery remaining bonded to the ground

• Certifications: CE, RoHS and REACH; UL 1741 and CSA C22.2 No. 107.1-01; GFPD-150V (UL-489); GFPD- 600V (UL-1077); Meets EMC directives; FCC Class B Part 15 compliant; NEC 690.5 compliant; Manufactured in a certified ISO 9001 facility



Maximum solar voltage (PV)

150 V 600 V
Maximum solar current (PV) 60 A 50 A
Nominal system voltage 12-24-36-48 V 12-24-36-48 V
Self-consumption < 0,5 W < 0,5 W

Ground fault threshold current

300 mA ± 10% 300 mA ± 10%
Operating temperature -40°C ÷ *50°C -40°C ÷ *50°C
Weight 2 kg (4.4 lbs) 4.4 kg (8.8 lbs)


Part No. Model Description Dimensions
68977K GFPD-150V Charge controller 26.9 x 12.8 x 11.2 mm (10.6 x 5.0 x 4.4 inch)
68978M GFPD-600V Charge controller 35.7 x 22.1 x 10.6 mm (14.1 x 8.7 x 4.2 inch)