NHP TemBreak PRO - Ground;Earth Fault Protection (GF)

Protection Settings
34
TemBreak PRO B_BE-UM-001-EN  V1.1.0
Ground/Earth Fault Protection (GF)
Ground Fault (GF) protection is protection against high strength insulation / earth faults. Ground fault is available for the B400_BEG to B1600_BEG in 3P
and 4P MCCBs.
GF is independent time protection and fixed at 20% of I
n
.
GF pickup current I
g
is fixed at I
g
= 0.2 x I
n
and is not adjustable.
The l
g
trip threshold tolerance for ground protection is ±15%.
GF time delay t
g
is also fixed at t
g
= 200ms and is not adjustable.
The trip time tolerance for ground protection is -20 ms / +50 ms
GF protection can be turned ON or OFF using the DIP switch on the MCCB by setting the GF switch (position 1) to the ON or OFF position, respectively.
 
  

  
 
Short Time Delay Settings
Description
G
I
g
= 0.2 x I
n
Ground fault protection threshold
t
g
= 200 ms
Ground fault delay
Notice: Enabling GF for 3 pole MCCBs on a 4-wire system may result in nuisance tripping in the case of
imbalanced loads. It is recommended in this case that GF should be disabled.