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4
Specifications
ON–OFF cycle counter
The ON-OFF cycle counter is a mechanical 5-digit readout
that shows the number of ON-OFF cycles of the ACB.
Counter readings serve as a guide for maintenance or inspec-
tion.
Auxiliary switches
The auxiliary switches operate during the ACB ON/OFF op-
eration.
Connections to the switches are made via screw terminals.
The auxiliary switches for draw-out type ACBs operate in the
CONNECTED and TEST positions.
The auxiliary switches for ACBs conforming to classification
society's rules operate in the CONNECTED position only.
The auxiliary switches have change-over contacts and are avail-
able for general service and for microload.
Auxiliary switch ratings
C
a
e t
g
o
y r
F
r o
g
e
n
e
a r
s l
e
v r
c i
e
Ü
R
e
s
s i
v i t
e
n I
d
u
c
v i t
e
A
: C
c
o
s
ø
0
V
l o
a t
g
e
Ö
o l
a
d
(
) A
o l
a
d
(
) A
D
: C
L
R /
0
0 .
A
C
1
0
0
2 -
5
0
V
5
5
A
C
2
5
1
5 -
0
0
V
5
5
D
C
3
0
V
1
1
D
C
1
2
5
2 -
5
0
V
1
1
Note 1: The chattering of b-contacts due to ON-OFF operation of the ACB lasts for less than 20 ms.
Note 2: Do not supply different voltages to contacts of a switch.
4 0
For microload ¶¶
Type
For general service
¶
AXR-004
4c
AXR-007
7c
AXR-304
4c
AXR-010
10c
AXR-307
7c
¶The standard contact arrangement of the auxiliary switches is 4c.
(Form c: Change-over, single gap, three terminals)
¶¶Suited to electronic circuits
Note: 4c is the maximum arrangement when any one of the ground
fault protection on the line side, zone interlock, external display,
or communication function is incorporated or in the case of type
AGR-31B OCR with the ground fault trip function incorporated.
¶¶
F
r o
m
c i
o r
o l
a
d
Ü
3 .
R
e
s
s i
v i t
e
n I
d
u
c
v i t
e
A
: C
c
o
s
ø
0
6 .
Ö
1
o l
a
d
(
) A
o l
a
d
(
) A
D
: C
L
R /
0
0 .
0
7
0
1 .
0
1 .
—
—
0
1 .
0
1 .
—
—
Key lock
The key lock is available in two types:
the lock-in ON type that locks the ACB
in the closed position, and the lock-in
OFF type that locks the ACB in the open
position.
When the ACB is fitted with a key lock,
the operator cannot operate the ACB un-
less using a matched key.
—
—
3c
—
Example: Interlock for prevention of parallel feeding from two sources
3c
ACB 3 cannot be closed
Source 1
ACB 1
Load 1
M
i
. n
a
p
p
c i l
a
b
e l
o l
a
d
D
C
5
V
1
m
A
Key interlock
The key interlock is a system of interlocking between ACBs, each fitted with a key
lock of lock-in OFF type.
• A key must be inserted to release the lock before the ACB can be closed.
• The ACB must be opened and locked in the OFF position before the key can be
removed.
By utilizing the lock-in OFF type key lock feature, and then a limited number of keys
by default provides an effective and reliable interlock system.
Using the same keys also allows interlocking between an ACB and other devices
(such as a switchboard door).
ACBs can be supplied with a cylinder lock or type FS-2 Castell lock (with an angular
movement 90° clockwise to trap key).
A double Castell interlocking facility suitable for applications such as UPS systems is
available as a special specification contact Terasaki.
Facility or full option including locks are available, please specify.
For other lock types contact Terasaki.
ACB 2 cannot be closed
Source 2
Source 1
ACB 2
ACB 1
ACB 3
ACB 3
(bus-tie breaker)
(bus-tie breaker)
Load 2
Load 1
Load 2
ACB 1 cannot be closed
Source 2
Source 1
Source 2
ACB 2
ACB 1
ACB 2
ACB 3
(bus-tie breaker)
Load 1
Load 2
4 1
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