Effective 2/2/2001
Page 12
I.L. 70C1037H03
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 R5.
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
