Circuit Breaker Fail Logic - Part - GE P4A Technical Manual

Chapter 8 - CB Fail Protection
4.2

CIRCUIT BREAKER FAIL LOGIC - PART 2

External Trip A
Pole Dead A
IA<FastUndercurrent
Logic 0
V00730
Figure 94: Circuit Breaker Fail logic - part 2
Note:
This diagram shows only phase-A for a single-CB device. The diagrams for phases B and C follow the same principle and are
not repeated here.
188
1
1
&
&
&
&
S
4
R
3
Ext Prot Reset
2
I< Only
CB Open & I<
1
Prot Reset & I<
Prot Reset OR I<
0
Rst OR CBOp & I<
4
3
2
1
0
P54A/B/C/E
TripStateExt A
Q
D
Latch ATripResetIncomp
P54xMED-TM-EN-1