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ABB MMCO-2
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R
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51
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52
REAL
TIME
CLOCK
POWER
SUPPLY
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7
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D
RY
MONITOR
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RANGING
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COMPUTER
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TRIP
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DERD
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MRN
CIRCUIT
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ALTERNATE
R
POS
X
REMOTE
T
RESET
LA
COMMUNICATIONS
OPTION
7
51
IS
-
o
-
X
r
-
O
-
X
OPTO
-
1
ISO
51
20
NEG
REMOTE
RESET
OPTION
ALTERNATE
B
POS
4
GRD
30
CKD
-
10
OR
H
3
)
CKRC
)
^
DIREC DIREC
L
-
O
-
*
OPTO
51
ISO
18
51
19
OPTO
ISO
Q
-
X
51
20
NEG
DIRECTIONAL
OPTION
51
-
TIME
OVERCURRENT
RELAY
MMCO
52
-
CIRCUIT
BREAKER
CM
1609
C
74
Sub
1
CM
-
J
Figure
12
.
MMCO
External
Schematic
co
CM
Courtesy of NationalSwitchgear.com

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