ons are identical in all sizes to 3200A. There are two
common widths or frame size, from 800-2000A and from 2500-3200A for the
standard series. The panel cutout size is the same for all types of DH series ACB,
which makes it easy to arrange the ACBs in switchboards.
Maximum power from minimum volume was central to the design specification.
With a depth of 290mm for the fixed type and 345mm for draw-out, it is one of the
smallest ACBs in the world.
Increased accessibility from the front
It enhances ease of installation, operation, and maintenance.
The double insulated design ensures that most accessories can be safely and
easily, installed by the user. Control, auxiliary and position switch terminals are
mounted at the front on the ACB body for easy access. Due to the increased level
of harmonics within the distribution network, the neutral phase is fully rated as
standard.
No extra arc space required,
vertical stacking permitted
The DH series ACB dissipates all arc
energy within its unique Double Break
arc chamber.
The internal energy dissipation within
the ACB allows the clearance distance
of the ACB to nearby earthed metal to
be zero. This will assist in minimizing
switchboard height and costs.
Air circuit breakers DH series
The new FUJI DH series of air circuit breakers (ACB) feature
numerous improvements over the DB series, resulting in
greater compactness, lighter weight, and easier operation.
The new series offers a wide range of rated voltages, with
seven types ranging from 800A to 4,000A. Standard, high, or
super high breaking capacity can be selected to match the
scale of the equipment being used. A large variety of
accessories are also available, and all operation, wiring, and
parts installation and replacement can be done from the front
panel of the breaker. This ensures both safety and efficiency
in control panel mounting, maintenance, and inspection.
W: 354
Standard type
800 to 2000A
High breaking type
1250 to 2000A
W: 460
2500 and 3200A
1600 to 3200A
D: 345
W: 631
4000A
D: 375
H: 460
458
345
DH Series
DB series
Saved Space
Breaker fixing bolt
(optional)
Replacement of
internal parts
(Removing the front cover
enables replacement of
internal parts.)
Connection to the
control circuit
Manual operation
Draw-out operation
No extra arc space
required
DH Series
1250A
3200A Fuji Electric FA Components & Systems Co., Ltd./D & C Catalog
Information subject to change without notice
08/49
08
Air Circuit Breakers
DH series
Very fast interruption by Double Break system
The unique Double Break main contact system ensures
extremely fast interruption of short-circuit currents and
substantially reduces main contact wear. The internally
symmetrical Double Break structure allows reverse power
connection.
No clamp screws used for the main circuit contact
units
There are no clamp screws or flexible leads in the main
circuit contact units.
This substantially enhances the durability of the main circuit
contact units and improves the reliability in ON-OFF
operation.
Enhanced selectivity
At FUJI we are so concerned about selectivity that all our
protection relays have LSI characteristics as standard.
This provides an adjustable time delay on overload (L) and
also the l
2
t ramp characteristic (S).
As shown, these are essential to provide selectivity when
grading with other protective devices such as downstream
fuses and upstream relays.
The standard LSI curve provides more than five million
combinations of unique time current characteristics.
Zone selective interlocking is available to provide zero time
delay selectivity.
As the rated breaking capacity is identical to the rated short-
time withstand current, full selectivity can be achieved.
Isolating main contact
Fixed main contact
Moving main contact
Main circuit contact units
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1250A
1600A
2000A
1600A
2000A
2500A
3200A
4000A
1250A
1600A
2000A
2500A
3200A
DH12
DH16
DH20
65kA
80kA
85kA
100kA
100kA
DH12H
DH16H
DH25
DH30
DH16P
DH40
DH20P
DH25P
DH30P
DH20H
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LSI ACB
LI
ACB
BS142/IEC 60255-3
IDMT relay
EI curve 50A
PMS= 1.0, TMS=0.35
IEC 60947-2
DH12 / 800A
BS 88/ IEC 269
250A Fuse switch
11kV
500kVA
Z = 5%
415kV
R
L: Long time delay
S: Short time delay
I: Instantaneous 08/50
Fuji Electric FA Components & Systems Co., Ltd./D & C Catalog
Information subject to change without notice
Air Circuit Breakers
DH series
Optimum protective coordination
The FUJI ACB DH series is equipped
with an RMS sensing overcurrent
trip device (OCR) having a wide range
of protection functions and capabilities.
FUJI ACB is available with a choice of
flexible protection curves to assist in
selectivity applications.
S.I. Standard Inverse
V.I. Very Inverse
E.I. Extremely Inverse
All these curves are user definable and
comply with IEC 60255-3. Standard
transformer and generator protection
characteristics are also available.
Overload protection
Adjustable from 40100% of rated
current. True r.m.s detection up to the
19th harmonic, a distant vision for the
competition who rarely see past the
7th. Neutral protection for all those
Triple-N harmonics, such as 3rd, 9th
and 15th. Also in case we forgot to
mention, a
thermal memory as standard!
Two channel pre-trip alarm
function (S-characteristic) *
1
This function can be used to monitor
and switch on additional power backup
to feed critical circuits. For example,
the function can be set so that when a
pre-trip alarm is activated, an
emergency generator starts to ensure a
constant supply. This feature is only
available on some AGR21 OCR
models with a generator S-
characteristic.
N-phase protection function
(optional)
In 3-phase, 4-wire systems that contain
harmonic distortion, the 3rd harmonic
may cause large currents to flow
through the neutral conductor. The N-
phase protection function prevents the
neutral conductor from sustaining
damage or burnout due to these large
currents. Available in all OCRs except
for generator S-characteristic types.
Reverse power trip function (S-
characteristic) *
1
(The first-ever feature for ACBs)
This feature provides additional
protection when paralleling generators.
The AGR21 OCR for generator
protection with the reverse power trip
function, negates the need for
installation and wiring in an external
reverse power relay. This feature is
available using an AGR21 OCR with a
generator S-type characteristic types
only.
Earth leakage trip function (L/R-
characteristic) *
1
Used in conjunction with an externally
mounted zero-phase current
transformer (ZCT), this function
provides protection against leakage to
earth of very small levels of current.
Trip or alarm indication, and contact
output is available to enhance the level
of system protection. Available using
general purpose L/R-characteristic
AGR21 OCR.
Adjustable undervoltage trip
function UVT *
1
Available as a fixed type, or with
adjustable voltage pick up and an
adjustable time delay. 3-phase phase-
loss protection is also available.
AGR21 OCRs.
Contact temperature monitoring
function (optional) *
2
This function monitors the temperature
of the ACBs main contacts. An alarm
indicates when the temperature
exceeds 155°C. Continuous monitoring
of the contact temperature provides
valuable input for preventative and
predictive maintenance programs.
*1: Not available for standard OCRs, type AGR-
11.
*2: Available for type AGR-21 OCR only.
Standard OCR
with adjustment
dial Type AGR-11
Enhanced OCR
with adjustment
dial Type AGR-21
t
I
I
0.02
t
It
I
2
t=S.I.
I
3
t=V.I.
I
4
t=E.I.
Inverse Definite Minimum Time (I.D.M.T.)
AGR-L Industrial & transformer protection
AGR-S Generator protection
AGR-R Characteristics to IEC 60255-3 Fuji Electric FA Components & Systems Co., Ltd./D & C Catalog
Information subject to change without notice
08/51
08
Air Circuit Breakers
DH series
DH 08 3 X H - M 11LAL F
Optional accessories
Auxiliary switch (7c)
Auxiliary switch (10c)
Auxiliary switch (7c)
for general 4c, for low level circuits 3c
Auxiliary switch (10c)
for general 7c, for low level circuits 3c
Control circuit screw terminal
Open (off) padlock
Automatic closing spring release device
Continuously rated shunt trip device
Capacitor trip device
Undervoltage (instantaneous) trip device
Undervoltage (500ms time delay) trip
device
Control circuit safety shutter
Position switches
Test jumper
Mis insertion protection device
Breaker fixing bolts
Door interlock
Key lock
Key interlock
Mechanical interlock
Manual reset device
IP55 cover
Control circuit terminal cover
Earthing device
Arc barrier
Door flange
Basic type
Frame size
08:
800A
12:
1250A
16:
1600A
20:
2000A
25:
2500A
30:
3200A
40:
4000A Number of poles
3:
3-pole
4:
4-pole Installation
P:
Fixed
X:
Draw-out with cradle
Q:
Draw-out with cradle &
shutter Breaking capacity class
Blank: Standard
H:
High
P:
Super High Closing mechanism
T:
Manual-spring
M:
Motor-spring
ex. M = 100V DC: for motor 100 to 100V DC
Overcurrent release device
11LAL: Standard (LT, ST, INST/MCA)