4 4
4 5
Specifications
4
8
Operation Environments
The standard environment for ACBs is as follows:
Ambient temperature
–5°C to +40°C
The average temperature for 24
hours must not exceed 35°C.
Relative humidity
45% to 85%
Attitude
Below 2000 m
Atmosphere
Excessive water vapor, oil vapor,
smoke, dust, or corrosive gases
must not exist.
Sudden change in temperature, con-
densation, or icing must not occur.
Standard environment
Tropicalization (Fungus and moisture treatment)
Specify this treatment when the ACB is used under high-tem-
perature and high-humidity conditions.
Conditions: Max. permissible ambient temperature 60°C
Max. permissible humidity 95% rel.
No condensation
Cold climate treatment
Specify this treatment when the ACB is used in cold areas.
Conditions: Min. permissible storage temperature –40°C
Min. permissible operating temperature –25°C
No condensation
Anti-corrosion treatment
Specify this treatment when the ACB is used in a corrosive
atmosphere.
Contact Terasaki for details.
Special environment
Earthing device
There is a growing demand in L.V. distribution for greater pro-
tection against electric shock particularly during periods when
maintenance work is being carried out on the main busbars or
cables. A safe and economical way to meet this requirement is
to apply system earthing via the normal service breaker.
Earthing devices on
TemPower2
ACBs comprises; Permanent
parts which are factory fitted by Terasaki and are mounted on
the ACB chassis and body to enable the ACB to receive the
portable parts. Portable parts are supplied in loose kit form
and are fitted on to the ACB body by the customer’s engineer.
This converts the ACB from a normal service device to an
earthing device.
When the ACB is converted to the earthing device mode, the
over-current release and the other electrical tripping devices
are automatically disabled to prevent the remote opening of
the ACB.
It is recommended that the ON-OFF operating buttons be pad-
locked to prevent manual opening of the ACB when used in
the earthing mode.
UVT function can not be applied to the earthing device.
For further information contact Terasaki for details.
Permits the ACB to be padlocked in the
OFF position. Max. three padlocks with
ø6 hasp can be fitted. Padlocking is pos-
sible only when ON-OFF indicator
shows OFF. When the ACB is padlocked
in the OFF position both manual and
electrial closing become inoperative, but
the charging of the closing spring by
manual or motor is still possible.
Note1: OFF padlock facility cannot be
fitted with key lock or key interlock.
OFF padlock
An inter-pole barrier prevents a possible
short-circuit due to foreign objects
entering between the poles of the main
circuit terminals or between the line and
load ends, thus enhancing operational
reliability of the ACB.
This barrier can be applied to the draw-
out type ACB with vertical terminals or
horizontal terminals.
Inter-pole barrier
An IP cover provides an IP55 grade of
protection as defined in IEC 60529.
Even if the breaker body is on the
ISOLATED position, IP cover can still
be fitted on the ACB.
IP cover
Panel Cutout
Panel
Hinge
Bushing
Gasket
Panel
250
335
375
325
365
340
97
84
286
266
30
10
Insert gasket and
bushing when the
IP cover is fixed.
Hexagon
socket
head bolt
Domedcap nut
Hook(ø6
Padlocking)
Floor level
for ACB
Recommendation for Busbars connection
The busbars to the ACB should be firmly supported near the ACB terminal. Fault currents flow through the busbars developing a
large electromagnetic force between the busbars, and the support must be strong enough to withstand such forces. The ACB
should not be relied on as a single support.
The maximum distance of the connection point of ACB to the first busbar support
L
ACB
Busbar support
Busbar
L
ACB
Busbar support
Busbar
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