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Ground-fault Detection/

interruption (GfDi)

Ground-fault is the Most Common type of fault in pV applications
If not properly protected, ground-faults in PV arrays could result in large fault currents which may increase the risk of fire hazards.
The National Electric Code states that grounded (Article 690.5) and ungrounded (Article 690.35) PV arrays shall be provided with
a ground-fault protection device to reduce fire hazards. Mersen offers solutions for ground-fault protection for 600VDC, 1000VDC
and 1500VDC applications.

UL 1741, “Inverters, Converters, Controllers, and Interconnection System Equipment for Use with Distributed Energy Resources”
covers the requirements for the above mentioned equipment in stand-alone or utility-interactive power systems.

Section 31.2 - The ground-fault detector/interrupter shall sense a ground-fault, interrupt the ground-fault current path and
provide an indication of the fault when the ground-fault currents exceed the limits shown in the table below.
Device DC Rating (kW) Maxiumum ground-fault current
detecting setting (Amperes)
0 - 25 1
25 - 50 2
50 - 100 3
100 - 250 4
> 250 5

Dimensions
600VDC Ground-fault Protection Solution

1000VDC/1500VDC Grount-fault Protection Solution

Twin terminal covers
PS 20 V: Connecting distance between centers
Catalog #: F 097226 W: Clip for rail mounting in two positions
Weight: 20g W’: With terminal cover length
Y: Space factor with a 90° fuse carrier position
Packaging: 3 twins Z: Without terminal cover, space factor with a 180° fuse
carrier position
Z’: With terminal cover, space factor with 180° fuse
carrier position

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