Fuji Electric BT2 Series User manual

Air Circuit Breakers BT2 Series
Information in this catalog is subject to change without notice.
5-7, Nihonbashi Odemma-cho, Chuo-ku, Tokyo, 103-0011, Japan
URL http://www.fujielectric.co.jp/fcs/eng
Printed in Japan 2012-1 L20 FOLS EEH606
Air Circuit Breakers BT2 Series
EEH606
EEH606_cover.indd 1 12/01/23 11:34

2
BT2 Series 1600 to 6300A
Features .................................................................... 3
Type number nomenclature ........................................ 6
Specifi cations ............................................................. 7
Appearance ................................................................ 8
Intelligent controller (OCR) ......................................... 9
Communication ......................................................... 14
Characteristics curve ................................................ 16
Accessories .............................................................. 23
Technical data ........................................................... 28
Dimensions and mounting ........................................ 30
Wiring diagram ......................................................... 54
Ordering form ........................................................... 62
Ordering notice ......................................................... 63
Contents
Air Circuit Breakers
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3
Air Circuit Breakers
BT2 series
Breaking Capacity
Icu is equal to Ics up to 120kA at maximum and Icw is up to 100kA at maximum under 400VAC distribution.
Selection guide
Series BT2 series
Frame size 1600, 2000, 2500, 4000, 6300
No. of poles 3, 4
Installation Fixed Available
Draw-out Available
Closing Mechanism Manual spring or motor spring
Tripping Mechanism Shunt trip, Under-voltage trip
Protection function Long time delay, Short time delay, Instantaneous, Ground fault, etc.
Features

4
Air Circuit Breakers
BT2 series
5
产 品 特 点
简便安装、节约成本
CW2系列断路器具有更简单的安装方式，可以
简便实现
CW2 Series Circuit Breakers can be simply
installed as follows:
Horizontal connection
Vertical connection
Composite connection
Simply installed、cost-saving
水平连接
垂直连接
混合连接
先进可靠的安全性能
CW2系列断路器具有可靠的:
抽屉座三位置锁定和自动解锁装置，安全
确认“连接”、“试验”、“分离”三个位置。
Advanced and reliable safety performance
CW2 Series Circuit Breakers are reliable by the
following aspects:
Reliable assurance of the three positions:
connected、test、separated by the locked and
automatically unlocked mechanism at the draw-out
socket.
优异的升级换代性能
CW2-2000断 路 器 ， 可直 接 替 换原CW1-
2000断路器，无需改变母排和柜门的开孔尺寸。
Outsta ding upgrade performancen
CW2-2000 can directly substitute for CW1-
2000 without changing copper bar and aperture
dimensions on the panel sheet.
5
产 品 特 点
简便安装、节约成本
CW2系列断路器具有更简单的安装方式，可以
简便实现
CW2 Series Circuit Breakers can be simply
installed as follows:
Horizontal connection
Vertical connection
Composite connection
Simply installed、cost-saving
水平连接
垂直连接
混合连接
先进可靠的安全性能
CW2系列断路器具有可靠的:
抽屉座三位置锁定和自动解锁装置，安全
确认“连接”、“试验”、“分离”三个位置。
Advanced and reliable safety performance
CW2 Series Circuit Breakers are reliable by the
following aspects:
Reliable assurance of the three positions:
connected、test、separated by the locked and
automatically unlocked mechanism at the draw-out
socket.
优异的升级换代性能
CW2-2000断 路 器 ， 可直接替换原CW1-
2000断路器，无需改变母排和柜门的开孔尺寸。
Outsta ding upgrade performancen
CW2-2000 can directly substitute for CW1-
2000 without changing copper bar and aperture
dimensions on the panel sheet.
Clear indication of ready-for-switching-on to ensure safe
manipulation and reliable operation.
More reliable safety protection with seconday terminals of
protection grade IP30
Compact size
BT2 series, Air Circuit Breakers, have five framesize and four
physical dimension sizes.
Ampere
frame
1600 2000 2500 4000 6300
Appearance
Width 248mm 347mm 401mm 767mm
Installation
The bus bar terminal of the BT2 series, Air Circuit Breakers, can
be simply installed as follows:
• Horizontal connection
• Vertical connection
• Composite connection
Safety performance
BT2 series, Air Circuit Breakers, are reliable by the following
aspects:
• Reliable assurance of the three positions:
Connected
Test
Separated
by the locked and automatically unlocked mechanism at the
draw-out socket.
Indication of ready-for-
switching-on:"ok"
Features

5
Air Circuit Breakers
BT2 series
21
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24
21
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21
22
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21
22
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L25 Intelligent Controller M25 Intelligent Controller M26 Intelligent Controller H26 Intelligent Controller P25 Intelligent Controller P26 Intelligent Controller
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Intelligent controller (OCR)
Selecting OCR's, it can be classified into six types
Protection and selection
BT2 Series, Air Circuit Breakers, can implement selective
interlock of ZSI Region to ensure comprehensive selection
of various protection and reduce the copper bar's bearing of
thermodynamic.
Type L25 M25 M26 H26 P25 P26
Option Standard Option Option Option Option
Pic
Display/setting Light columnar indication LED digtal indication LED digtal indication LED digtal indication LCD indication LCD indication
Dial setting by knob Consecutive
parameter setting
Consecutive
parameter setting
Consecutive
parameter setting
Consecutive
parameter setting
Consecutive
parameter setting
Protection/
function
Features

6
Air Circuit Breakers
BT2 series
Type number nomenclature
OCR type or Additional accessories
• OCR type (note: M25 is standard), See page 9
Type Code Remarks
L25 L5A
M25 – (None)
H26 H6A
P25 P5A
P5B w harmonic analysis function
P5C w communication function
P5D w alarm of current-imbalance
P26 P6A
P6B w harmonic analysis function
P6C w communication function
P6D w alarm of current-imbalance
Frame size
1600, 2000, 2500, 4000, 6300
Installation
P: Fixed type
X: Draw-out type
Number of poles
3: 3 poles
4: 4 poles
Rated current
1600AF: 0200, 0400, 0630, 0800, 1000, 1250, 1600
2000AF: 0630, 0800, 1000, 1250, 1600, 2000
2500AF: 1250, 1600, 2000, 2500
4000AF: 2000, 25000, 2900, 3200, 3600, 4000
6300AF: 4000, 5000, 6300
Basic type
CE version
Type
LED indicator of Voltage
Load-monitoring function
ZSI function
(Zone selective interlock function)
Under voltage release
Switching OFF lock device
Mechanical interlock device
(Two sets of ACB's)
Mechanical interlock device
(Three sets of ACB's)
Current transformer for neutral
line N connected externally
Electrical mechanism for the
indication of draw out socket's position
Separator plate between phases
Electrical module for indication
of ready-for-switching-on
"Button" Locking device
Counter
Communication function choice
of accessories
DC power supply module
AC power supply module
Automatic transfer switch (ATS)
（included automatic controller,
connector and 1.8m cable)
Code
C1
C2
C3
R1
R2
Q1
Q2
Q3
MW1
MB1
MW2
MB2
MB3
MB4
N1
N1
N2
N3
N4
N6
D1
B3
B4
RFS
L
CM
S1
S2
S3
S4
PD1
PD2
PD3
PA1
PA2
AS1
AS2
AS3
Remarks
Instananeous
Time delay
One lock and one key
Two lock and one key
Three lock and two key
Steel lock interlock
Link rod interlock (0,6m)
Cable type interlock
Pattern one of rod interlock
Pattern two of rod interlock
Pattern three of rod interlock
1600AF L・M・H Controller
1600AF P Controller
2000AF
2500AF
4000AF
6300AF
3P
4P
Components of draw-out socket communication module
Ready-for-switching-on signal
Under-voltage signal
Fault-trip signal
24VDC
110VDC
220VDC
230VAC
400VAC
R type
S type
F type
• Accessories
BT2-2500P / 32500E
Type number nomenclature

7
Air Circuit Breakers
BT2 series
Specifications
Frame size 1600A 2000A 2500A 4000A 6300A
Basic type BT2-1600 BT2-2000 BT2-2500 BT2-4000 BT2-6300
No. of poles 3 4 3 4 3 4 3 4 3 4
Rated current (A) 200, 400, 630, 800,
1000, 1250, 1600
630, 800, 1000,
1250, 1600, 2000
1250, 1600, 2000,
2500
2000, 2500, 2900,
3200, 3600, 4000
4000, 5000, 6300
Rated current of the neutral pole
(IN)
100% In 100% In 100% In 100% In 100% In
Rated insulation voltage (Ui) 1000 1000 1000 1000 1000
Rated operational volage (Ue) 690 690 690 690 690
Rated ultimate short-circuit
breaking capacity (Icu kA,
sym)
690VAC *140 50 50 75 85
400VAC 50 80 85 100 120
Rated service short-circuit
breaking capacity (Ics kA,
sym)
690VAC *125 50 50 75 85
400VAC 50 80 85 100 120
Rated making current
(kA, peak)
690VAC *184 105 105 165 187
400VAC 105 176 187 220 264
Rated short time withstand
current (Icw) (kA, rms)
690VAC *125 (0.5s) 40 (1s) 50 (1s) 75 (1s) 85 (1s)
400VAC 42 (0.5s) 60 (1s) 65 (1s) 85 (1s) 100 (1s)
Rated impulse withstand voltage
(Uimp) (kV)
12 12 12 12 12
Installations
Fixed P
Draw-out X
Main circuit terminal connection
Fixed Horizontal
Vertical – –
Draw-out Horizontal
Vertical
Dimensions
Fixed W 254 324 362 457 362 457 414 527 782 1008
H 320 320 395 395 395 395 395 395 395 395
D 197 197 290 290 290 290 290 290 290 290
Draw-out W 248 318 347 442 347 442 401 514 767 993
H 351.5 351.5 438 438 438 438 438 438 475.5 475.5
D 297 297 390 390 390 390 395 395 395 395
Note: *1 Cannot be used for an IT distribution system.
Available
Specifications

8
Air Circuit Breakers
BT2 series
6
5
4
3
2
1
17
16
8
9
10
11
12
13
14
15
21 20
19
18
22
23
24
Appearance
• Fixed
7
6
5
4
3
2
1
8
9
10
11
12
• Draw-out
<Common>
1: Name plate
2: Indications of energy-storage and energy-release
3: ON button
4: Manual energy-storage handle
5: Brand
6: Terminals of sencondary circuit (fixed)
7: Off lock mechanism
8: Release indication and resetting button
9: Inteligent controller (OCR)
10: OFF button
11: Indications of "ON" and "OFF"
12: Indication of ready-for-switching-on ("OK")
<For Draw-out>
13: "Unlock button" of the three positions
("Separated", "test" and "connected") *1,2
14: Safety padlock mechanism
15: Racking shaft operating hole
16: Racking shaft storage hole
17: Indications of the three position
("Separated", "test" and "connected")
Note: *1 "Separated": Indicates that main circuit and secondary circuit are both in
isolation."Test": Indicates that main circuit is in isolation and secondary
circuit is in connection."Connected": Indicates that main circuit and
secondary circuit are both in connection.
*2 The ACB can be automatically locked (racking shaft can not be turned
at the point) when its main part is at the position of "separated","test"
or "connected" by turning the racking shaft, and can be unlocked by
pushing "unlock button" to the left side.
• Draw-out cradle
The cradle has the back plate for isolating the copper bar of
the main circuit, which take the role of safety protection when
the ACB is drawn out.
18: Installation hole
19: Safety back plate
20: Wiring terminals of secondary circuit
21: Side plate
22: Copper bar of the main cirucit
23: Draw-out socket
24: Earthing point at draw-out socket
Appearance

9
Air Circuit Breakers
BT2 series
Intelligent controller (OCR)
Selecting OCR's, it can be classified into six types
Type L25 M25 M26 H26 P25 P26
Option Standard Option Option Option Option
Overcurrent protection
(Long-time, Short-time, insantaneous)
Ground-fault protection – – –
Load monitor function –
Indication Light Columnar LED LED LED LCD LCD
Power, electric energy, power-factor, frequency indication – – –
Alarm function (pre-trip alarm, overload alarm) – – – –
Test function – – – – –
Contact Welding indication
Self-diagnosis function –
MCR funciton –
Fault-memory funciton –
Current-imbalance indication
Thermo-analogue function –
Harmonic analysis function – – – –
ZSI function –
Communication function – – –
Note: Reprensents fundamental functions, Represents selective functions, – Represent no such functions
Function
Over-current protection
• The over-current protection is composed of phase and neutral line
protection (Four pole breaker and three pole breaker with current
transformer linking externally to neutral N) from over-current.
• The parameters of current and time of phase line over-current
protection can be set by the company in terms of the requirements
of users (can be set by customers themselves); the parameters of
current and time of neutral line over-current protection will be set
according to the setting of the phase line, all these mainly divided
into the following two situations:
Three pole breaker with the neutral connected eaternally
• To type L25, M26, H26 intelligent controller, when ordering the goods
the neutral line setting current customers should have to confirm the
protecting data, it has two type of 50%In and 100%In.
• To type P25, P26 intelligent controller, the customers can setup
into four types from menu:turn off, 50%In, 100%In, 200%In. When
200%In neutral line protecting (if it has a high triple frequency
harmonic), the neutral line cross section should be double leg of a
circuit cross section in the electrical power distribution system. But to
BT2-6300 three circuit breaker, there is no neutral line protecting.
Four pole breaker
• To type L25, M25, M26, H26 intelligent controller, the customers
should have to confirm the protecting data, it has two types of 50%In
and 100%In.
• To type P25, P26 intelligent controller, the customers can setup into
three types from menu:turn off, 50%In, 100%In.
Overload protection
• Inverse long-time delay overload protection, and its setting current Ir1
can be adjusted.
• The delay time t1 of overload long-time delay can be adjusted.
• The long-time delay overload characteristic of the type P25, P26, the
curves can be adjusted. There have common type (I2t), uncommon
inverse-time type (It), high-voltage fuse concert type (I4t) can be
adjusted, which can matching higher-up and lower-lever's overload
protection'needs. The long-time delay overload characteristic ofthe
type L25, M25, M26, H26, its running according to the common type (I2t)
curves,current Ir1, time t1 can beadjusted.
Short-time short circuit protection (can be OFF)
• Inverse short-time delay short circuit protection (I2t ON), and its
setting current Ir2 can be adjusted.
• Definite short-time delay short circuit protection (I2t OFF), and its
setting current Ir2 can be adjusted.
• The delay time t2 of short circuit short-time delay can be adjusted.
Instantaneous short circuit protection
• The setting current Ir3 of instantaneous short circuit (can be OFF)
can be adjusted.
t
I
Setting current Ir1 of overload long-time delay
Setting delay time t1 of overload long-time delay
Setting current Ir3 of instantaneous short circuit
Setting delay time t2 of short circuit short-time delay
Inverse short-time delay short circuit (I2t ON)
Setting current Ir2 of short-time circuit short-time delay
Delay time of
overload long-time
delay adjustable
Definite short-time
delay short circuit(I2t OFF)
Long-time delay, short-time delay,
instantaneous protection
Intelligent controller

10
Air Circuit Breakers
BT2 series
Ground-fault protection
• Definite ground-fault protection, and its setting current Ir4 can be adjusted
• Delay time t4 can be adjusted
• Alarm but not break after being off
I
t
Setting current Ir4 of ground-fault
Setting current t4 of ground-fault
• TN-C, TN-C-S, or TN-S, power distribution system
without additional current transformer of neutral
• TN-S, power distribution system, 4 poles • TN-S, power distribution system, 3 poles
L1
PEN
L2
L3
Intelligent
controller
BT2 circuit breaker with three poles
Transformer Current transformer
For exmple : TN-C system
N
PE
L1
L2
L3
Intelligent
controller
Transformer Current transformer
For example: TN-S system
BT2 circut breaking with four poles
N
PE
L1
L2
L3
N line current transformer
connected externally
Transformer
Current transformer
Intelligent
controller
For example: TN-S system
BT2 circut breaking with three poles
t
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Setting current ILC2 of load monitoring (Limiting load)
Setting current ILC1 of load monitoring (Limitiong load)
Setting delay time tc1 of load monitoring
Setting delay time tc2 of load monitoring
Acting characteristic of two kinds of ultimate setting load
t
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Setting current ILC2 of load monitoring (reload)
Setting current ILC1 of load monitoring (Limiting load)
Setting delay time tc2 of load monitoring
Setting delay time tc2 of load monitoring (definite)
Acting characteristic of ultimate setting value of load and reload
• Pattern 1: Two circuits of down stream load can be controlled.
When the operating current of the main circuit rises over the
setting value of ILC1 and ILC2, contact signal will be sent out
after time durations of tC1 and tC2 repectively. Then this two
circuits with monitored load are broken off by receiving the
instructions from the intelligent controller.
• Pattern 2: Only one circuit with down stream load can be
controlled. When the operating current of the main circuit
rises over the setting value of ILC1, contact signal will be sent
out after time duration of tC1, and this circuit is broken off by
receiving the instructions from the intelligent controller. If the
operating current of the main circuit decreases lower than
the setting value of ILC2 after this circuit is broken off, the
signal will be sent out again after time duration of tC2 for the
open loading circuit to be closed (reloaded) and so the power
supply of this circuit is restored.
• Load monitoring signals"(1)" and "(2)" corresponding to ILC1
and ILC2 respectively are transmitted into contact signals
via the wiring terminals 13, 14 and 15, 16 of the secondary
circuit. There will be LED indication at the time when signals
are transmitted. (The load monitoring signals from the
intelligent controller will be cut off in half second after the
signal of contact closing is transmitted, and the capacity of
contact is AC230V 5A)
Load monitoring function
• To monitor the down stream load so as to ensure power
supply of main system
• There are two patterns of load monitoring from which users
can choose one. The setting value of load-monitoring current
are ILC1 and ILC2 , normally ILC1 is larger than or equal to ILC2
• Inverse characteristic of load-monitoring is the same of
inverse long-time delay overload characteristic.
Intelligent controller

11
Air Circuit Breakers
BT2 series
Indication and measurement function
• For L25, M25, M26 and H26
Item Type of OCR's Display Content Indication and measurement range Accuracy
Current L25 Light columnar Indication I1, I2, I3, IN
I1, I2, I3, IN , Imax
I1, I2, I3, IN , IG, Imax
(0.1In to 2In) A ± 5%
M25
M26, H26
LED
Voltage M25, M26 as optional
H26 as standard
LED U12, U23, U31, Umin 30V to 690V ± 3%
• For P25 and P26
Item Display Content Indication and measurement range Accuracy
Current LCD I1, I2, I3, IN (0.1In to 2In) A ± 1.5%
IG0.1In to 2000A ± 2.5%
Voltage Line Voltage: U12, U23, U31 30V to 690V ± 0.5%
Phase Voltage: U1N, U2N, U3N
Power Three-phase active power -120MW to +120MW ± 2.5%
Three-phase reactive power -120Mvar to +120Mvar
Three-phase apparent power -120MVA to +120MVA
Power-factor Power-factor -1.00 to +1,00 ± 2.5%
Electric energy Three-phase active electric energy -1010GWh to +1010GWh ± 2.5%
Three-phase reactive electric energy -1010Gvarh to +1010Gvarh
Three-phase apparent electric energy -1010GVAh to +1010GVAh
Frequency f 45 to 65Hz ± 0.1Hz
Fundamental current I1-1, I2-1, I3-1, IN-1 (0.1In to 2In) A ± 1.5%
Fundamental line voltage U12-1, U23-1, U31-1 30V to 690V ± 0.5%
Fundamental phase voltage U1N-1, U2N-1, U3N-1
Fundamental power P1 -120MW to +120MW ± 2.5%
Q1 -120Mvar to +120Mvar
S1 -120MVA to +120MVA
Harmonic ratio Current 0 to 1000% ± 5%
Voltage
Total harmonic distortion
(THD)
Current
Voltage
Alarm and fault functions
Over-current
alarm
Type L25 Corresponding LED on
the panel will be "ON"
Alarm and release indication lights will be on after the circuit breaker's being overloaded or
released (yellow or red)
Type M25 After the circuit breaker's being released by long-time delay overload, short-time delay short
circuit and instantaneous short circuit, indication lights of corresponding alarm will be on.
Type M26, H26 After the circuit breaker's being released by long-time delay overload, short-time delay short
circuit, instantaneous short circuit and ground-fault, indication lights of corresponding alarm will
be on.
Type P25, P26 After the circuit breaker's being released by long-time delay overload, short-time delay short
circuit and instantaneous short circuit, indication lights of corresponding alarm will be on.
Fault indication Type L25 Corresponding LED on
the panel will be "ON"
After the circuit breaker's being released by long-time delay overload, short-time short circuit
and instantaneous short circuit, indication lights of corresponding fault type will be on.
Type M25 After the circuit breaker's being released by long-time delay overload, short-time short circuit
and instantaneous short circuit, indication lights of corresponding fault type will be on.
Type M26, H26 After the circuit breaker's being released by long-time delay overload, short-time delay short
circuit, instantaneous short circuit, instantaneous short circuit and ground-fault, indication lights
of corresponding fault type will be on.
Type P25, P26 After the circuit breaker's being released by long-time delay overload, short-time delay short
circuit and instantaneous short circuit, indication lights of corresponding alarm will be on.
Indication of
fault phase,
current and time
Type M25,
M26, H26
Indication Indication of faulty phase, breaking value of fault current and breaking time
Type P25, P26 Indication It can indicate the latest ten times fault categories and occurrence time, faulty phase, breaking
value of fault current and breaking time.
Intelligent controller

12
Air Circuit Breakers
BT2 series
Test functions
Panel button Type L25, M25, M26,
H26, P25, P26
Release Inspeciton of T-I characteristic of the OCR and the conditions of operating mechanism
Type M25, M26, H26,
P25, P26
Non-release Inspeciton of T-I characteristic of the OCR
• Contact wearing indication (for M25, M26, H26, P25 and P26)
The intelligent controller has the function of contact wearing
indication. Accordingly, the percentage of the equivalent to
wearing times of main contact to electrical life-span times of
the circuit breaker can be indicated by pushing the button of
"wearing indication".
• Self-diagnosis function (for M25, M26, H26, P25 and P26)
When the microprocessor of the intelligent controller breaks
down or the ambient temperature of the microprocessor rises
over 80°C±5, alarm signals can be sent out immediately.
• MCR function
When the circuit breaker is on or the controller is initially
electrified, the circuit breaker would trip instantly if short-time
short circuit fault occurred.
• Fault-memory function (for M25, M26, H26, P25 and P26)
The types and phases of fault, value of faulty current and
breaking time would be indicated on the intelligent controller if
the circuit breaker broke off as a result of faults.
• Current disequilibrium display (selective function for P25 and P26)
The intelligent controller can sent out and display, when the
three phases current disequilibrium level reached the setting
value (20%-80%).
Note: the three phases current disequilibrium= Imax-Imin
Imax
×100%
• Harmonic analysis function (for P25 and P26)
P25 or P26 intelligent controller with harmonic analysis
function can measure fundamental current, fundamental
line voltage, fundamental phase voltage, fundamental power,
odd harmonic current ratio (HRIh) from the third to thirty-first,
harmonic voltage ratio (HRUh), total harmonic distortion of
current (THDi, thdi) and total harmonic distortion of voltage
(THDu, thdu).
• Harmonic ratio (HR)
The ratio of RMS of hth harmonic component in the periodical
alternating quantum to RMS of fundamental component (express
by percent).
• Harmonic current ratio of hth expresses HRIh.
HRIh= Ih
I1-1
×100%
Note: Ih-harmonic current of hth of phase A (RMS)
• Harmonic voltage ratio of hth expresses HRUh.
HRUh=
Uh
U12-1
×100%
Note: Uh -harmonic line voltage of hth between phase A and B.
• Total harmonic distortion (THD)
• The ratio of harmonic content in the periodical
alternating quantum to RMS of fundamental component
(THD)(express by percent).
THDi=
I2
h
I1-1
×100%
THDu= U2
h
U12-1
×100%
Note: Ih-harmonic current of hth of phase A (RMS)
Uh-harmonic line voltage of hth between phase A and B (RMS)
• The ratio of harmonic component in the periodical
alternating quantum to RMS of periodical alternating
quantum(thd) (express by percent).
thdi=
I2
h
I1-1 ×100%
thdu= U2
h
U12-1
×100%
Ntoe: Ih-harmonic current of hth of phase A (RMS)
Uh-harmonic line voltage of hth between phase A and B (RMS)
Intelligent controller

13
Air Circuit Breakers
BT2 series
Zone selective interlock
Zone selective interlock (ZSI function) (for M25, M26, H26, P25 and P26, optional)
21
22
23
24
21
22
23
24
21
22
23
24
21
22
23
24
Note: 21,22,23,24 serve as the wiring teminals of secondary circuit.
Busbar
Release delay t2
Zone1
Circuit breaker
at higher level
Control line
Control line
Busbar
Release delay t2
Zone2
Fault
Control line
Control line
Busbar
Zone3
Down stream circuit breaker
When pieces of circuit breakers are linked together up and
down, zone selective interlock (ZSI) can ensure fully-selective
protection of circuit breakers at higher or lower level so as to
reduce the range of action by fault and the breaking time of
circuit breakers. This function serves for short-time delay short
circuit (I2t OFF) and ground-fault protection of circuit breakers.
As the sketch shown above, control lines can interlock with
pieces of circuit breakers.
After detecting the fault, the intelligent controller (zone 2) will
send out a signal to circuit breakers (zone1) at higher level and
check whether the signal of circuit breakers (zone 3) at lower
level arrives. If circuit breakers at lower level send out a signal,
the circuit breaker will be on at the time duration of release
delay; if circuit breakers at lower level don't send out a signal,
the circuit breaker will break off instantly no matter whether the
release has the protection of delay.
Note: The end 23 and 24 should be shortcircuited.
Intelligent controller

14
Air Circuit Breakers
BT2 series
Communicative
To achieve the function of "four kinds of remote operation" at
long distance by communication interface of the circuit breaker,
namely, remote control, remote communication, remote
adjustment and remote detection.
• Communication protocol : The application of Modbus-RTU mode
• Communication interface
• Standard interface: RS-485.
• Baud rate: 19200bps (in favour of 1200, 2400, 4800, 9600, 38400bps)
• Communication address:1-119.
• Byte format: First bit as start bit, eighth bit as data bit, second bit as stop bit,
even check (in favour of non-check, odd check .)
• Network characteristic
• Twisted-pair shielded cables serve as communication lines.
• One line can link up 32 pieces of communicative circuit breakers at the same
time (16 pieces of circuit breakers with components of draw-out socket
communication module).
• Wiring distance is 1200m at maximum but the distance of communication
can be extended by equipping with repeaters additionally.
Communication data
• Real-time current, voltage fundamental current, fundamental voltage, power,
power factor, electric energy, harmonic current or voltage ratio and total
distortion of current or voltage.
• State data of circuit breakers such as alarm, fault, energy-storage, under-
voltage, ready-for-switching-on, and the positions of switching-on and
switching-off etc.
• The position of main body of the circuit breaker (components of
communication module of draw-out socket for BT2 need to be purchased).
• The fetching and modification of the setting values of circuit breakers.
• Recorded data of fault last time.
• Outline data such as serial numbers and the type etc of circuit breakers.
• Long-distance operation if switching-on and switching-off.
• Circuit breakers can be switched on or off in the long-distance.
• Wiring terminals for communication.
21 41018
11 3197
Terminal Signal Function
8 DATA+(A+) Receive/transmit data
10 DATA-(B-) Receive/transmit data
12 SH In connection with shielded layer of
communication line
Blue
White
One group
Shielding layer
Standard twisted-pair shielded cable
Communication cable
Note: please use the type of communication cable with the shielding layer and
approach to circuits with strong electricity should be avoided as far as
possible when wiring in the cabinet.
Colour Signal Funation
Blue DATA+ Receive/transmit data
White DATA− Receive/transmit data
Shielding layer GND Grounding
As the above diagram shows, a group of twisted-pair lines
in the standard communication cable is employed as the
communication line of 485 and the sheilding layer is grounded.
The actual practice should be possibly different such as the
application of the colour of the twisted-pair line. Users could
define the ways of cable's usage by themselves but the
definition of the signal of each line in the cable should be made
clear in advance.
Communication

15
Air Circuit Breakers
BT2 series
Note: As the accessory of selective purchase, the draw-out socket
communication module should be selected into use when users need read
the location of main body in the long distance by the choice of draw-out
circuit breakers.
Linking diagram of communication system
Monitoring computer
RS232/RS485
Converter
Modbus
Draw-out socket
communication module
RS232
RS485
DATA+
DATA−
BT2
BT2 BT2
BT2
Communication

16
Air Circuit Breakers
BT2 series
Ir1
0.4 1 1.5 3 10 15
0.01
0.02
0.1
0.2
1
10
100
1000
10000
t (s)
0.3
0.4
Ir1
t1
long-time delay curve
Ir2
I2T ON
I2T OFF
Instantaneous curve
t2
Short-time delay curve
Instantaneous range
Illustrational curve
The range of long-time delay
Ir1 =(0.65~1)In
t1=15s~480s
The range of short-time delay
Ir2=(1.5~10)Ir2+OFF
t2=0.1s~0.4s
Instantaneous range
Ir3=(3~15)Ir1+OFF
Characteristic curve
Characteristic curve of general l2t
• BT2-1600~BT2-6300
T/I (time / current) curve of type L25 intelligent controllers (OCR)

17
Air Circuit Breakers
BT2 series
kA
Instantaneous curve
Ir1
0.4 1 1.6 8010 15
0.01
0.02
0.1
0.2
10
100
1000
10000
t (s)
0.3
0.4
1
Ir1
t1
long-time delay curve
Ir2
t2
Instantaneous range
I2T ON
I2T OFF
Short-time delay curve
Illustrational curve
The range of short-time delay
Ir2=(0.4~15)In+OFF
t2=0.1s~0.4s
The range of long-time delay
Ir1=(0.4~I)In
t1=10s~120s
Instantaneous
range
Ir3= 1.6kA~35kA+OFF BT2-1600
2kA~50kA+OFF BT2-2000
2.5kA~50kA+OFF BT2-2500
4kA~65kA+OFF BT2-4000
6.3kA~80kA+OFF BT2-6300
Characteristic curve
• T/I (time / current) curve of type M25, M26, H26, P25 and P26 intelligent controllers (OCR)

18
Air Circuit Breakers
BT2 series
0.4 1 10
0.01
0.02
0.1
0.2
1
10
100
1000
10000
t (s)
0.3
0.4
1.6 15
kA
Ir1
80
Ir1
t1
Ir2
I2T ON
I2T OFF
Short-time delay curve
t2
Instantaneous curve
Instantaneous range
long-time delay curve
Illustrational curve
The range of long-time delay
Ir1=(0.4~1)In
t1=10s~120s
The range of short-time delay
Ir2=(0.4~15)In+OFF
t2=0.1s~0.4s
Instantaneous
range
Ir3= 1.6kA~35kA+OFF BT2-1600
2kA~50kA+OFF BT2-2000
2.5kA~50kA+OFF BT2-25
4kA~65kA+OFF BT2-4000
6.3kA~80kA+OFF BT2-6300
Characteristic curve
Characteristic curve of inverse time delay special It
• T/I (time / current) curve of type 25 and 26 intelligent controllers (OCR)

19
Air Circuit Breakers
BT2 series
0.4 1 10
0.001
0.1
0.2
1
100
1000
10000
100000
t (s)
0.3
0.4
1.6 15
kA
Ir1
80
10
0.01
Ir1
t1
long-time delay curve
Ir2
I2T ON
Short-time delay curve
t2
I2T OFF
Instantaneous curve
Instantaneous range
Instantaneous
range
Ir3= 1.6kA~35kA+OFF BT2-1600
2kA~50kA+OFF BT2-2000
2.5kA~50kA+OFF BT2-2500
4kA~65kA+OFF BT2-4000
6.3kA~80kA+OFF BT2-6300
The range of short-time delay
Ir2=(0.4~15)In+OFF
t2=0.1s~0.4s
The range of long-time delay
Ir1=(0.4~1)In
t1=60s~1440s
Illustrational curve
Characteristic curve
Characteristic curve of high-voltage fuse I4t
• T/I (time / current) curve of type 25 and 26 intelligent controllers (OCR)

20
Air Circuit Breakers
BT2 series
0.2 0.8 10 100
In
1
0.01
0.1
0.2
1
10
100
1000
t (s)
0.3
0.4
Maximum
Grounding current
Ir4=(0.4
~ 0.8)In(BT2-1600)
Ir4=(0.2
~ 0.8)In(BT2-2000, BT2-2500)
Ir4=(0.2 ~ 0.6)In(BT2-4000)
Ir4=(0.2 ~ 0.5)In(BT2-6300)
t4=0.1s ~ 0.4s four steps
Ir4 Maximum 1000A (For BT2-1600)
Maximum 1200A (For BT2-2000, BT2-2500)
Maximum 1600A (For BT2-4000)
Maximum 2000A (For BT2-6300)
Characteristic curve
• T/I (time / current) curve of type M26, H26 and P26 intelligent controllers (OCR) for ground-fault protection