Mitsubishi Electric MELPRO-A Series Instruction Manual page 11

External connection diagram (Example)
R S T
DS
kt
k
K
ZCT
L
ℓ
E
ℓt
VT
Current tripping
TC1 TC2
coil
CB
C1R
C2
CT
T2R
E
D
Overcurrent relay
R S T
DS
kt
k
K
ZCT
L
ℓ
ℓt
F
CB
CT
E
D
MGR-A3T-R
Z Z P P B
1 2 1 2 1
D
Buzzer
E
BZ
D
AC110V
Current
changeover
C1T T1R a1
switch
C2
T1T a2
T2T
MOC-A3T-R
Fig. 3-3 Current tripping type
MGR-A3V-R
Z Z P P
1 2 1 2
E
D
E
D
VT
Voltage tripping coil
52a Pallet switch
C1R C1T T1 a1
a2
C2R C2T T2
MOC-A3V-R
Overcurrent relay
Fig. 3-4 Voltage tripping type
L
E
B T T O O S S S
2 1 2 1 2 1 2 0
E
D
Another current
limiter
52a
Pallet switch
1. Connect
2. Current limiter is to be
specified according to the
rating of CB's trip coil.
3. If S terminal and a built-
1
A
in reactor are used, there
～
is no need of wiring for S
terminal.
E
a b c B B
1 2
E
D
BZ
Buzzer
AC110V
Auxiliary
power
supply
Current
changeover
switch
A
～
11
【Tripping route】
(1) When a earth fault occurs,
the CB is tripped through
the sequence from the power
source to S
tripping coil, T
and to S
(2) When a short circuit fault
occurs
When using another
current flows between C1R
current limiter
and T1R and make the CB trip.
As for in T phase, the CB is
AC100/110V
tripped through the sequence
from C1T to T1T , O
tripping coil, T
4. This figure shows that
line.
5. Do not short-circuit kt
6. If the power supply of
0
【Tripping route】
(1) When a earth fault occurs, the CB is
tripped through the sequence from the
power source to tripping coil, 52a, c,
and to a.
(2) When a short circuit fault occurs, the CB
is tripped through the sequence from the
power source to tripping coil, 52a,
T1 , and to T2 .
1. Connect line.
2. This figure shows that MOC-A3V-R overcurrent
relay is combined.
3. Do not short-circuit kt and ℓt terminal of ZCT.
, contact, T ,
1 1
, contact,
2
.
2
in R phase, the
, T ,
1 1
, and to O .
2 2
MOC-A3T-R overcurrent
relay is combined.
and ℓt terminal of ZCT.
S -S is derived from the
1 2
load side of CB, the
pallet switch is not
needed.
JEP0-IL9555