Effective 10/2004
Page 15
I.L. 70C1036H05
Figure 2.2 3-Pole, 4-Wire Circuit Breaker with Neutral Sensor Connections for Standard Circuit Breaker Using Residual
GF Sensing
Figure 2.3 Neutral Sensor Connections for Double Wide Circuit Breaker Using Residual Ground Fault Sensing
In this scheme, all breaker secondary currents (at the 100mA level) are summed together at the
pc board donut transformer to sense ground fault via element R
5
.
No jumper on secondary contacts B-6, B-7.
Neutral input (if 4-wire) is via contacts B-4, B-5. Neutral current input to secondary contacts is 1A,
equivalent to 1 per unit ground.
Source
L
N
R
5
Digitrip
with GF
R/1
R/1
3
3
2
2
1
1
B-4
Load
Notes:
B-6
10:1
10:1 AUX. CT
B-5
B-7
Black
Trip
Actuator
+
-
L
B
L
C
L
A
1
1
1
Source
Load
B-4
B-6
20:1 AUX. CTs
20:1
B-5
B-7
Black
Trip
Actuator
+
-
L
A2
L
B1
L
B2
L
C1
L
A1
L
N1
L
N2
L
C2
2000:1
2000:1
2000:1
2000:1
2000:1
2000:1
2000:1
2000:1
1
1
2
2
Notes:
R
5
Digitrip
with GF
In this scheme, all breaker secondary currents (at the 100mA level) are summed together at the PC
board donut transformer to sense ground fault via element
.
In this scheme, the current sensors in the breaker poles are parallel-wired to achieve a 4000 amp
breaker rating. Other available ratings in this double-wide configuration are 6300A, 6000A, 5000A,
3200A, 2500A, and 2000A.
R
5
3
Shown is ABCABC bus configuration.
3
