Eaton Digitrip 520 - Page 14

14
Instructional Leaflet IL70C1037H05
Effective October 2009
Digitrip models 520, 520i; and 520M, 520Mi,
520MC, 520MCi trip units for use only in
Magnum and Magnum DS circuit breakers
EATON CORPORATION www.eaton.com
Figure 9. Digitrip Neutral Sensor Types (or Source Ground Sensor)
Figure 10. Four-Pole 3200A Frame (4000A IEC) Using Residual Ground Fault (Earth-Fault) Sensing
Item Current Ratio
H01 200:1
H02 250:1
H03 300:1
H04 400:1
H05 600:1
H06 800:1
H07 1000:1
H08 1200:1
H09 1600:1
H10 2000:1
H11 2500:1
H12 3000:1
H13 3200:1
H14 630:1
H15 1250:1
H16 3150:1
H17 4000:1
H18 100:1
All secondary currents to be 1.00A nominal
at full scale.
Insulation level: 0.6 kV, BIL 10 kV, full-wave
Continuous thermal current rating factor:
1.33 at 30°C ambient.,1.0 at 55°C ambient
L
N
R
5
R/1
R/1
K2-8
B-6
K1-4
K1-3
10:1
10:1 Aux. CT
K2-9
B-7
K1-5
K1-2
+
-
L
B
L
C
L
A
K1-6
K1-7
K1-8
K1-9
1
1
1
Source
Black
Trip
Actuator
Digitrip 520
with GF
a
a
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
.
b
Do not jumper on secondary contacts
B-6, B-7. This will defeat all ground
fault protection in application for
four-pole breaker.
b
Load