CR2L-75 [FUJI]
Electric Fuse, Super Fast Blow, 75A, 250VAC, 100000A (IR), Inline/holder,;
| 型号： | CR2L-75 |
| 厂家： | 
FUJI ELECTRIC |
| 描述： | Electric Fuse, Super Fast Blow, 75A, 250VAC, 100000A (IR), Inline/holder, 电路保护 |
| 文件： | 总12页 (文件大小：809K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Low Voltage Fuses
BLC, CR and CS types
Super Rapid Fuses
BLC, CR and CS types
Super Rapid Fuses
150–1500 Volts AC
10–4700 Amps
ꢀ Description
The FUJI BLC, CR and CS types are
extremely reliable fuses which have
been specially developed to provide
protection for silicon diodes and
thyristors and are suitable for inverters
using semiconductors or transformers-
rectifiers. FUJI Super Rapid Fuses are
designed with a very small total I2t
value which gives them a high speed
interrupting action in the face of
abnormal currents.
In addition the arc voltage generated at
the time of interruption has a low value
so that faults will not influence related
electric machinery and equipment.
These fuses can carry out the
SD-36
SM-388
SI-431
SI-429
BLC
CR2L
CS5F
CS10F
semiconductors short or circuits fail the
sound elements will be quickly isolated
from the fault circuits.
• High interrupting capacity of 200kA
at 1000V AC
• The CS type is provided with a blown
fuse indicator. An alarm contact
block (1NO or 1NC) can also be
attached.
ꢀ Features
• The total clearing I2t is small and the
semiconductor circuit is completely
protected.
ꢀ UL recognized: CR2L/UL,CR2LS/UL,
CR6L/UL
(File No. E92312)
CSA certificated: CR2LS/UL
(File No. LO4000-4090)
TÜV: CR2LS/UL (10-100A),
CR2L/UL (150-350A)
protection of many types of circuits
rating from the semiconductor
overcurrents to destructive short-
circuiting faults-i.e. when the
• Since the peak arc voltage at the
time of interruption is low damage to
other equipment does not occur.
(Rep. No. E9450643E02)
CR6L/UL (50-300A)
(Rep. No. E9560543E02)
ꢀ Specifications
Rated Rated Peak
current voltage arc
Max.
Watt
Fuse-link
Type
Rated Rated Peak
current voltage arc
Max.
Watt
Fuse-link
Type
interrupting I2t loss
interrupting I2t loss
voltage (Amp2×sec.)
voltage (Amp2×sec.)
× 103
× 103
(A)
12
(V)
1550
(W)
(A)
10
(V)
Max.
AC 500
(W)
550V
0.09
5.1
8.5
10
BLC012-1
BLC020-1
BLC023-1
BLC045-1
BLC075-1
BLC090-1
BLC120-1
BLC140-1
CR2L-30
CR2L-50
CR2L-75
CR2L-100
CR2L-125
CR2L-140
CR2L-150
CR2L-175
CR2L-200
CR2L-225
CR2L-260
CR2L-300
CR2L-325
CR2L-350
CR2L-400
CR2L-450
CR2L-500
CR2L-550
CR2L-600
250V
0.04
1.2
3.0
CR2LS-10
CR2LS-20
CR2LS-30
CR2LS-50
CR2LS-75
CR2LS-100
CR6L-20
CR6L-30
CR6L-50
CR6L-75
CR6L-100
20
30
0.17
0.35
0.85
2.3
20
23
AC 1550
1550
0.27
0.39
1.8
5
4.0
45
1380
19
50
6.0
75
1250
32
75
9.0
08
90
1250
11.5
33
100
38
100
4.0
12.0
120
140
1200
51
20
30
600V
Max.
0.14
0.35
1.8
3.0
7.0
4.0
7.0
9.0
12.5
15
1200
59
AC 1200
30
50
75
250V
Max.
0.35
4.0
6.0
9.0
12.0
14.0
16.0
18.0
50
AC 500
0.85
2.3
4.0
6.5
7.0
9.5
75
100
100
125
140
150
150
200
250
300
350
400
500
600
18
22.0
34.0
37.0
40.0
45.0
55
CR6L-150
CR6L-200
CR6L-250
CR6L-300
CR6L-350
CR6L-400
CR6L-500
CR6L-600
30
70
95
175
200
225
260
300
325
350
13
21.0
23.0
26.0
30.0
35.0
37.0
37.0
150
200
390
700
17
22
27
38
49
60
60
70
Interrupting capacity
CR2LS . 100kA at 250V AC
CR6L .... 100kA at 600V AC
400
450
500
550
600
103
140
160
200
215
39.0
46.0
48.0
51.0
56.0
Interrupting capacity
BLC ...... 100kA at 550V AC
CR2L .... 100kA at 250V AC
Fuji Electric FA components & Systems Co., Ltd./D & C Catalog
Information subject to change without notice
08/35
Low Voltage Fuses
BLC, CR and CS types
Super Rapid Fuses
ꢀ Specifications
ꢀ Specifications (UL-recognized, CSA certified, TÜV)
Rated Inter-
current rupting
capacity
Max.
Watt
Fuse-link
Rated Rated
current voltage rupting
capacity
Inter-
Max.
Watt
loss
Fuse-link
interrupting I2t loss
interrupting I2t
(Amp2×sec.)
× 103
(Amp2×sec.)
× 103
Type
Type
(A)
(kA)
(W)
310
(A)
10
20
30
50
75
(kA)
(W)
4700
150 at
125V AC
14000
CS1F-4700
250V AC 10 at AC
400V DC (pf: 0.8)
10 at DC
0.04
0.17
0.35
0.85
2.3
1.2
3.0
4.0
6.0
9.0
CR2LS-10/UL
CR2LS-20/UL
CR2LS-30/UL
CR2LS-50/UL
CR2LS-75/UL
2000
3000
150 at
250V AC 5500
1950
124
216
CS2F-2000
CS2F-3000
(L/R: 2ms)
40
75
200 at
500V AC 3.5
1
6.4
12
17
25
34
42
45
56
57
CS5F-40
CS5F-75
CS5F-100
CS5F-150
CS5F-200
CS5F-250
CS5F-300
CS5F-350
CS5F-400
CS5F-450
CS5F-500
CS5F-600
CS5F-800
CS5F-1000
CS5F-1000-P
CS5F-1200
CS5F-1200-P
CS5F-1500
CS8F-1000
CS8F-1200
CS8F-1500
CS10F-80
CS10F-100
CS10F-150
CS10F-200
CS10F-250
CS10F-300
CS10F-350
CS10F-400
CS10F-500
CS10F-560
CS10F-630
CS10F-750
100
4.0
12.0
CR2LS-100/UL
100
150
200
250
300
350
400
450
500
600
800
1000
1000
1200
1200
1500
5
10
18.5
33
150
200
260
350
400
450
500
550
600
9.5
17
27
60
103
140
160
200
215
18.0
23.0
30.0
37.0
39.0
46.0
48.0
51.0
56.0
CR2L-150/UL
CR2L-200/UL
CR2L-260/UL
CR2L-350/UL
CR2L-400/UL
CR2L-450/UL
CR2L-500/UL
CR2L-550/UL
CR2L-600/UL
64
85
122
131
159
257
600
1200
843
1800
1311
3600
62
73
80
20
600V AC 100 at AC
680V DC (pf: 0.8)
10 at DC
0.14
4.0
CR6L-20/UL
114
110
167
30
0.35
7.0
CR6L-30/UL
(L/R: 2ms)
114
200
209
125
176
220
17
21
27
37
44
50
75
100
150
1.8
3.0
7.0
18
9.0
12.5
15.0
22.0
CR6L-50/UL
CR6L-75/UL
CR6L-100/UL
CR6L-150/UL
1000
1200
1500
200 at
800V AC 2500
4400
1800
100 at AC
(pf: 0.8)
50 at DC
(L/R: 2ms)
200
30
95
34.0
40.0
CR6L-200/UL
CR6L-300/UL
80
100
150
200
250
200 at
1000V AC 16
10
300
37
63
110
148
211
307
420
410
450
640
Note:
•
Peak arc voltage
CR2LS, CR2L .... Max. 500V
CR6L .................. Max. 1200V
300
350
400
500
560
630
750
53
•
•
•
The peak arc voltage is obtained by interruption caused by the listed
interrupting current at rated voltage.
This indcates the values when the conductors specified in UL
Standards are connected and rated current apply.
TÜV: CR2LS, 2L: Up to 350A
70
74
90
102
135
156
CR6L: 50 to 300A
800
1000
1250
1500
450
630
1259
1722
2250
3200
211
245
330
334
134
170
280
350
CS10F-800-P
CS10F-1000-P
CS10F-1250-P
CS10F-1500-C
CS15F-450
CS15F-630
CS15F-900-P
CS15F-1250-P
ꢀ CR type fuse with optional accessory
Fuse with blown indication fuse
CR2L (S)-
G
100 at
350
1500V AC 760
1400
900
1250
3050
Note:
•
•
Peak arc voltage
CS1F ..... Max. 450V
CS2F ..... Max. 750V
CS5F ..... Max. 1000V
CS8F ..... Max. 2000V
CS10F ...Max. 2000V
CS15F ...Less than 3000V
AF88-446
An alarm contact block AHX2905 (1NO) or AHX2915 (1NC) can be
Fuse with blown indication fuse and precision switch
attached to CS type. (Sold separately) See page 08/44.
CR2L (S)-
S
Precision switch (SPDT)
CRX-1
Note: UL recognized fuse
In the UL recognized fuses, a fuse with a blown inidcation fuse, or a
fuse both with a blown indication fuse and a precision switch is also
UL recognized.
Examples: CR2L-200G/UL
CR2LS-30S/UL
precision switch
CR6L-100G/UL
AF88-445
AF88-442
Fuji Electric FA components & Systems Co., Ltd./D & C Catalog
Information subject to change without notice
08/36
Low Voltage Fuses
BLC, CR and CS types
Super Rapid Fuses
ꢁ
ꢀ Dimensions, mm
CR2L-450 or smaller, CR2LS
D
B
ꢁ
BLC
BLC012, 020, 023
BLC045
BLC075 to 140
øD
øD
ød
øD
Mounting hole a × b
ød
ød
H
F
Type
Rated
current
(A)
A
B
øD ød Color of
Mass
(g)
Blown indicatin
fuae (G type)
indicator
BLC012-1 12
BLC020-1 20
BLC023-1 23
BLC045-1 45
BLC075-1 75
BLC090-1 90
BLC120-1 120
BLC140-1 140
50
50
50
50
63
63
63
63
10
10
10
10
6
6
6
13
13
13
27
34
34
47
47
10 Grey
14 Yellow
14 Violet
20 White
12
12
12
62
A
5
8
8
8
Silver
Red
Yellow
Light red
120
120
120
215
Type
A
B
C
D
E
a×b
F
G
H
Mass
CR2L-30
CR2L-50
80 58 18 21.5 37 9×11 90 1.5 26.5 42g
6
Note: The BLC type fuse link requires a holder in use. The size of the
holder differs according to the fuse ratings. Select the most suitable
one after referring to the Table on page 08/44.
CR2L-75
80 58 20 30.5 44 9×11 90 3
32.5 100g
CR2L-100
CR2L-125
CR2L-140
CR2L-150
CR2L-175
For drawings see page 08/32.
CR2L-200
CR2L-225
CR2L-260
CR2L-300
CR2L-325
CR2L-350
CR2L-400
CR2L-450
CR2LS-10
CR2LS-20
CR2LS-30
CR2LS-50
CR2LS-75
CR2LS-100
85 60 25 33.5 47 11×13 93 3.2 33.5 130g
ꢀ Ordering information
Specify the following:
1. Type number
95 70 30 42
54 11×13 98 4
39 220g
ꢀ Type number nomenclature
BLC 012-1
56 42 12 18.5 34.5 6.5×8.5 78 2
25
28g
Rated current: 12 to 140A
Plug-in type super rapid fuse
CS 10F-1000 -P/ UL
UL recognized (CR2L, CR2LS, CR6L)
CSA certificated (CR2LS)
08
TÜV (CR2LS, CR2L, CR6L)
ꢁ
CR2L-500 to -600
84
70
31
2-fuse connected parallel
Optional accessory (See page 08/44)
G: With blown indication fuse
S: With blown indication fuse
and precision switch
Mounting hole 11×13
Rated current
10 to 4700A
41.5
43
98
84
46
Blown indication
fuse (G type)
Rated voltage
2L, 2LS: 250V AC,
6L: 600V AC
2F: 250V AC
8F: 800V AC
15F: 1500V AC
1F:
150V AC,
500V AC,
1000V AC,
5F:
10F:
CR: Barrel-shaped super rapid fuse
CS: Cubic-shaped super rapid fuse
Mass: 450g
95
Dimensions for reference only. Confirm before construction begins.
Note: The dimensions of the fuses with suffix. UL are the same as those of the
standard ones.
Fuji Electric FA components & Systems Co., Ltd./D & C Catalog
Information subject to change without notice
08/37
Low Voltage Fuses
BLC, CR and CS types
Super Rapid Fuses
ꢀ Dimensions, mm
ꢁ
ꢁ
ꢁ
CR6L-20, CR6L-30, CR6L-50
CR6L-75 to 300
CR6L-350 to 600
B
84
B
62
D
18.5
47
Mountng hole 11×13
41.5
43
46
Blown indication
Mountng hole a × b
D
fuse (G type)
H
Mountng hole 6.5×8.5
23.5
25
F
88
74
Blown indication
fuse (G type)
Blown indication
fuse (G type)
C
A
76
A
Mass: 42g
Type
A
B
C
D
E
F
G
H
a×b
Mass (g)
Type
A
B
C
D
Mass (g)
493
CR6L-75
CR6L-100
CR6L-150
95 70 25 34 47 102 3.2 33.5 11×13 150
CR6L-350
107
121
82
96
43
43
107
114
CR6L-400
CR6L-500
522
CR6L-200 107 82 30 42 54 107
CR6L-250
CR6L-300
4
39 11×13 246
CR6L-600
121
96
47.4
114
545
ꢁ
ꢁ
ꢁ
CS1F-4700
CS5F-40 to 1500
CS10F-80 to 750
CS15F-450, 630
CS8F-1000, 1200, 1500
CS2F-2000, 3000
Alarm contact block
Blown fuse indicator
Alarm contat block
AHX2905(NO)
AHX2915(NC)
Alarm contact block
Blown fuse indicator
Blown fuse
indicator
N.P.
M
B
A
A
B
51
72
2-MIO
M
Mass: 800g
Voltage Type
A
B
C
D
(Max.)
M
Mass
(g)
Voltage Type
A
B
C
D
(Max.)
M
Mass
(g)
500V
CS5F-40
CS5F-75
47
47 42.5 65.5 M8
320
800V CS8F-1000
CS8F-1200
72
74 54.5 84
M12 1060
CS5F-100
CS5F-150
CS5F-200
CS8F-1500
72
47
82 54.5 84
M8
1150
420
1000V CS10F-80
CS10F-100
71 42.5 65.5 M8
CS5F-250
CS5F-300
CS5F-350
57
72
51 47
70
M8
510
CS10F-150
CS10F-200
CS10F-250
57
72
74 47 70 M8
690
CS5F-400
CS5F-450
CS5F-500
CS5F-600
CS5F-800
51 54.5 77
M10 800
M12 830
CS10F-300
CS10F-350
CS10F-400
CS10F-500
CS10F-630
CS10F-750
74 54.5 77
M10 1060
M10 1400
CS5F-1000
CS5F-1200
CS5F-1500
72
51 54.5 77
1500V CS15F-450
CS15F-630
72 105 54.7 77
Fuji Electric FA components & Systems Co., Ltd./D & C Catalog
Information subject to change without notice
08/38
Low Voltage Fuses
BLC, CR and CS types
Super Rapid Fuses
ꢀ Characteristic curves
ꢀ Dimensions, mm
BLC
ꢁ
Melting time-current characteristic
CS5F-P CS10F-P, CS15F-P
Alarm contat block
M10
N.P.
72
ø15
86
158
Voltage
500V
Type
H
L
Mass (g)
CS5F-1000-P
CS5F-1200-P
51
69
92
1900
1000V
1500V
CS10F-800-P
CS10F-1000-P
CS10F-1250-P
74
2420
Current (A)
CS15F-900-P
CS15F-1250-P
105
123
3100
Operating time-current characteristic
ꢁ
CS10F-1500-C
7
max.77
7
M10
M10
Alarm
contat
block
107
M10
108
89.5
08
ø15
72
Mass: 2500g
Current (A)
Current-limiting characteristic
Available current (Sym, rms) I eff. (kA)
Fuji Electric FA components & Systems Co., Ltd./D & C Catalog
Information subject to change without notice
08/39
Low Voltage Fuses
BLC, CR and CS types
Super Rapid Fuses
ꢀ Characteristic curves
CR2L, CR2LS
Melting time-current characteristic
CR6L
Melting time-current characteristic
Current (A)
Current (A)
Operating time-current characteristic
Operating time-current characteristic
Current (A)
Current (A)
Current-limiting characteristic
Current-limiting characteristic
Available current (Sym, rms) I eff. (kA)
Available current (Sym, rms) I eff. (kA)
Fuji Electric FA components & Systems Co., Ltd./D & C Catalog
Information subject to change without notice
08/40
Low Voltage Fuses
BLC, CR and CS types
Super Rapid Fuses
ꢀ Characteristic curves
CS1F
Melting time-current characteristic
CS2F
Melting time-current characteristic
Current ( × 103A)
Current ( × 103A)
Operating time-current characteristic
Operating time-current characteristic
08
Current ( × 103A)
Current ( × 103A)
Current-limiting characteristic
Current-limiting characteristic
Available current (Sym, rms) I eff. (kA)
Available current (Sym, rms) I eff. (kA)
Fuji Electric FA components & Systems Co., Ltd./D & C Catalog
Information subject to change without notice
08/41
Low Voltage Fuses
BLC, CR and CS types
Super Rapid Fuses
ꢀ Characteristic curves
CS5F
Melting time-current characteristic
CS8F
Melting time-current characteristic
Current ( × 10A)
Current ( × 103A)
Operating time-current characteristic
Operating time-current characteristic
Current ( × 10A)
Current ( × 103A)
Current-limiting characteristic
Current-limiting characteristic
Available current (Sym, rms) I eff. (kA)
Available current (Sym, rms) I eff. (kA)
Fuji Electric FA components & Systems Co., Ltd./D & C Catalog
Information subject to change without notice
08/42
Low Voltage Fuses
BLC, CR and CS types
Super Rapid Fuses
ꢀ Characteristic curves
CS10F
Melting time-current characteristic
CS15F
Melting time-current characteristic
Current ( × 10A)
Current ( × 103A)
Operating time-current characteristic
Operating time-current characteristic
08
Current ( × 10A)
Current ( × 103A)
Current-limiting characteristic
Current-limiting characteristic
Available current (Sym, rms) I eff. (kA)
Available current (Sym, rms) I eff. (kA)
Fuji Electric FA components & Systems Co., Ltd./D & C Catalog
Information subject to change without notice
08/43
Low Voltage Fuses
BLC, CR and CS types
Super Rapid Fuses
ꢀ Operating indication
ꢁ Blown fuse indication
Fig. 1
Fig. 3
FUJI Super Rapid Fuses are available
in BLC, CR and CS types. These types
have different methods of indicating a
blown fuse.
ꢁ BLC type
A blown fuse is indicated by the color
tip on the ferrule of the fuse being
ejected as shown in Fig. 1. This can be
seen through the window of the fuse
holder.
Alarm contact block
AHX2905, 2915
SD-36
BLC type
Fig. 2
ꢁ CR type
CS10F
SM-385
This fuse does not have a blown
indicator but if a trigger fuse is
connected as shown in Fig. 2 this will
provide the alarm for blown fuse.
ꢁ CS type
Line
Alarm
circuit
Trigger
fuse
F
This fuse is provided with a blown fuse
indicator. In this case a pin in the
contact pad is ejected after the fuse
has been blown. If electrical
connections for lamps or alarms are
required fit the contact block (1NO or
1NC) to the pad as shown in Fig. 3.
Alarm
circuit
R
SH-384
CS 10F with alarm
contact block
AF88-446
Load
CR type
ꢀ Alarm contact block ratings
Type
Contact
Rated
voltage (V)
AC
DC
Inductive cosϕ=0.3~1
Resistive load
Inductive load
Rated operational Rated
capacity (W)
150
Rated operational Rated
Rated operational Rated
current (A)
capacity (VA) current (A)
capacity (W) current (A)
AHX2905 1NO
AHX2915 1NC
24
110
220
440
550
6
6
150
660
6
2.5
1
0.4
0.3
150
275
220
175
165
6
1.3
0.45
0.2
0.15
140
100
85
6
2.5
2
1320
1100
1100
85
ꢀ Fuse holder for BLC type fuse
Fuse link
Type
Rated
current
Base
Screw cap
Adaptor
ring
FUJI BLC fuses require special
Surface
connection
Type
Rear
connection
Type
holders. Select the most suitable one
which corresponds to the rated current
of the fuse.
(A)
Type
Type
BLC012-1
BLC020-1
BLC023-1
BLC045-1
BLC075-1
BLC090-1
BLC120-1
BLC140-1
12
20
23
45
75
90
120
140
AFa30
AFa30
AFa30
AFa60
AFa100
AFa100
AFa200
AFa200
Ba30
Ba30
Ba30
Ba60
Ba100
Ba100
Ba200
Ba200
Pa30
Pa30
Pa30
Pa60
Pa100
Pa100
Pa200
Pa200
R20
–
–
–
R75
–
Dimensions: See page 08/32.
–
–
SD-36
AF88-439
Fuse link
BLC
Fuse holder
Surface connection
Fuji Electric FA components & Systems Co., Ltd./D & C Catalog
Information subject to change without notice
08/44
Low Voltage Fuses
BLC, CR and CS types
Super Rapid Fuses
ꢀ Application and selection guide
BLC, CR and CS-type – Super rapid
fuse
Fig. (a)
ꢀ Fuse ratings
When selecting fuses various factors
such as protection, coordination and
load, etc. must be considered.
However, in this catalog the main
matters such as voltage, current and I2t
only are explained.
When selecting fuses for
semiconductor rectifier circuit protection
the following conditions must be
satisfied.
For additional details contact FUJI.
ꢁ
Line fuse method
In this method the fuses are connected to
the AC line side.
Rated voltage
ꢀ Conditions of application
1. The rated interrupting current of the
fuse must be greater than the
estimated short circuit current of the
circuit.
The rated voltage of the fuse indicates
the maximum operational voltage and
this also indicates the root-mean-
square value of the AC sinusoidal wave
voltage. Select fuses having a rated
voltage exceeding the voltage obtained
by the formula shown in the following
table. (Fig. 1)
Fig. (b)
Available short
circuit current
of rectifier circuit
Rated interrupting
current of fuse
<
Do not select current-limiting fuses with
rated voltages drastically exceeding the
rectifier circuit voltage. It is necessary
to consider the arc voltage.
2. The let-thru current value of fuse
must be less than the allowable 1/2
cycle surge current value.
Element fuse method
In this method the fuses are connected in
series to the semiconductor element.
Semiconductor – 1/2
Fuse let-thru
<
cycle allowable surge
current 10ms (at 50Hz)
current value
=
3. The total clearing I2t value which the
fuse requires to complete interruption
must be less than the allowable I2t
value of semiconductor.
Fig. 1 Rated voltage required by fuses
Wire connection
type
Wiring diagram
Rated voltage of Fuse (VFN rms)
Fuse – total
For line fuse
For element fuse
Semiconductor – I2t
<
clearing I2t
=
4. The rated current of the fuse must be
greater than the average forward
current of the semiconductor.
>
=
>
=
Single-phase bridge
3-phase bridge
V
V
V
FN
a · Ea
a · Ea
V
V
V
FN
a · Ea
a · Ea
Ea
Fuse –
rated current
Semiconductor –
average forward current
>
Ea
>
=
>
=
FN
FN
5. The rated current and voltage of the
fuse must be greater than those of
the rectifier circuit.
Ea
08
Fuse – rated
current and
voltage
Rectifier circuit –
current and voltage
>
>
FN a · 3 · Ea
=
3-phase, double star
FN a · 3 · Ea
=
>
Method of application
Remarks: The 'a' is a coefficient where the regulation of the AC input voltage is taken into account. This
is a=1.1 in case of voltage regulation 10ꢀ.
Semiconductor rectifier equipment has
a variety of rectifier circuits. Taking the
3-phase bridge rectifier circuit as an
example – Fig. (a) and (b) as shown in
the following.
Fig. 2 Element current and line current
Wire connection
type
Wiring diagram
Element fuse method Line fuse method
Element current Ia
Line current
I
Although the number of fuses used in
the line fuse method (a) is half the
number used in the element fuse
method (b), the fuses must have a
larger current capacity.
Id
Id
__
Ia =
I = d
Ia
Single-phase bridge
3-phase bridge
2
√
I
= 0.707d
Id
I
Id
2
3
__
Ia =
I
=
Id
3
√
Ia
= 0.577dI
= 0.816dI
Ia
I
Id
Id
__
I
= Ia =
3-phase, double star
2
3
√
= 0.289dI
Fuji Electric FA components & Systems Co., Ltd./D & C Catalog
Information subject to change without notice
08/45
Low Voltage Fuses
BLC, CR and CS types
Super Rapid Fuses
ꢁ
Rated current
The I2t data for silicon diodes or
Let-thru peak current (Instantaneous):
11,600 Amps
Let-thru R.M.S. current
The current values in fuses in the line
fuse system and the element fuse
system are different. Obtain the
correct current value from the table on
page 08/48 (Fig. 2).
When selecting the rated current of a
fuse choose a fuse having an
amperage rating greater than the
current which flows in the semi-
conductor if the load is continuous and
a fixed current.
thyristor elements are normally given in
their respective catalogs. If the A2S
data is not given in their catalog obtain
the value in the following manner. If
protection is needed for a 250V, 150A
(Io) diode having a maximum allowable
peak half sine wave current of 2700A, it
is important that the fuse has a total I2t
value lower than that of the diode.
11,600 ÷ 1.7 = 6,800 Amps
This example clearly shows that while
a 100kA (rms, sym) current is
available, the fuse limits the current let-
thru to 6,800 Amperes (rms, sym).
Peak let-thru current
(Actual short-circuit current)
Calculation
If the current which flows in the
Peak current of first half cycle
of available peak current
(AC component)
2
2
1 Peak
2
semiconductor is greater than the rated
current of the fuse connect the fuses in
parallel. However, in this case, if the
numbers of fuses arranged in parallel
are 'n', then the I2t value of the fuse will
be n2·I2t and n2 times the I2t value of
one fuse. This should be taken into
consideration when protective
coordination is taken into account.
In the case of the circuit where the load
rapidly varies the fuse element will
suffer from mechanical deterioration
and be damaged by thermal stress.
In loads of this type the deterioration
characteristics of the fuse must be
closely considered.
Moreover if the fuse current – time
characteristics of the fuse selected is
less than the overload characteristics
of the semiconductor element then
complete protection can be obtained.
However, if the semiconductor element
has a large capacity then protective
cooperation is very difficult to arrange.
The fuses are used to isolate the
shorted semiconductor element circuit
from sound operating circuits.
Maximum I t diode = (
) 0.0167
2700
= (
)2 0.0167
Short circuit current that
would pass without current-
limiting fuse.
2
= 30,400A2 Sec.
DC component
From the table (Page 08/38), the fuse
with a total I2t nearest to 30,400A2 Sec.
is the 260 Ampere fuse (CR 2L-260).
ꢀ Interrupting current
The rated interrupting current of the
fuse must exceed the maximum value
(Symmetrical RMS value) of the
estimated circuit fault current.
Time
M
A
T
M:Melting time
ꢀ Peak arc voltage
In the case of the current-limiting fuse
an arc voltage (overvoltage) is
generated at the time of interruption
due to its fusible element construction.
It is necessary to check that this peak
arc voltage does not exceed the
semiconductor's maximum (Non-
repetitive peak) reverse voltage value.
A :Arcing time
T :Total clearing time
Available
105,000
11,600
ꢀ Current limitation
Let-thru
200A
Select a fuse whose let-thru current
value does not exceed the allowable
1/2 cycle surge current of the
semiconductor. The allowable surge
current is the peak value of the current
which in case at 50Hz is allowed to
flow for 10ms. In the current-limiting
fuse the fault must be cleared in the
shortest possible time or in the first
1/2 cycle.
ꢀ Total clearing I2t
The total clearing I2t of fuse is a very
important factor when considering the
protective coordination of the
semiconductor. This total clearing I2t is
the value where the arcing I2t is added
to the melting I2t. Therefore it is
necessary to satisfy the following
formula.
100,000A
Available RMS symmetrical current(Ampere)
Available current is the current which
would flow if the fuse were not current-
limiting.
Fuse – total
Semiconductor
<
clearing I2t
I2t
=
The total clearing I2t of fuse depends
upon the operational voltage and
interrupting current.
This would cause damage to
equipment. Let-thru current is the
actual current allowed to flow by the
current limiting action of the fuse. A
number of let-thru current graphs are
given in this catalog and example is
given in the following paragraph. The
method of reading this graph is
provided for your reference.
Therefore, for this reason if a 500 Volts
fuse is used in a 300 Volts circuit the
total clearing I2t is reduced by 50–70ꢀ.
However, the reduction rate varies
according to the type of fuse
construction. This must be checked
and confirmed once more.
How to find a let-thru current
– Example
Fuse: 200 Amps 500V
Available R.M.S symmetrical current:
100,000 Amps
Example
I2t
All I2t values are ampere2 seconds.
Fuji Electric FA components & Systems Co., Ltd./D & C Catalog
Information subject to change without notice
08/46
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