Effective 8/13/99
Page 12
I.L. 70C1037H02
Figure 2.4 Digitrip Neutral Sensor Types
Figure 2.5 4-Pole–3200A Frame Using Residual Ground Fault (Earth-Fault) Sensing
In this scheme, all breaker secondary currents (at the 100 mA level) are summed together at the PC
board donut transformer to sense ground fault via element R
5
.
Do not jumper on secondary contacts B-6, B-7. This will defeat all ground fault protection in
application for 4 pole breaker.
Ground fault style trip unit is installed.
3
2
1
Notes:
Source
L
N
R
5
Digitrip 520
with GF
R/1
R/1
2
1
K2-8
Load
B-6
K1-4
K1-3
10:1
10:1 AUX. CT
K2-9
B-7
K1-5
K1-2
Black
Trip
Actuator
+
-
L
B
L
C
L
A
K1-6
K1-7
K1-8
K1-9
1
1
1
Courtesy of NationalSwitchgear.com
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