Date:- 17 Mar, 2005
Data Sheet Issue:- 1
Ultra Rapid
Semiconductor Protection Fuse
BS 88 Round Body Fuses – 250V
British Standard
Voltage Rating 250V
Current Ratings from 5A to 180A
aR Characteristics
Sizes 10x28 and 17x27
Key Features:
Extremely high interrupting rating fuses for the protection of power semiconductors as per IEC
Standard 60269.1 and 4.
250V voltage rating complying with IEC 33
Non Magnetic construction
gR Characteristics for ratings 5A to 32A (LCW range) comply with VDE 636-23 and IEC 60269.4
17 x 27 models are UL recognised
aR Characteristics with current ratings from 5A to 180A (LEW or LEWI range) comply with VDE 636-
23 and IEC 60269.4
Available with or without separate trip indicator BS88-4
Microswitch reference: MC 6.3 GR 2-5 N
Data Sheet LCW, LEW Issue 1
Page 1 of 5
March, 2005
WESTCODE
An
IXYS Company
BS 88 Round Body Fuse - 250V
Main Characteristics:
LCW : 10x28 without trip indicator
Voltage
U
N
(V)
Size
Ref:
5LCW
6LCW
10LCW
250
10x28
12LCW
16LCW
20LCW
25LCW
32LCW
Micro
Switch
N
N
N
N
N
N
N
N
UL
N
N
N
N
N
N
N
N
Current
rating
I
N
(A)
5
6
10
12
15
20
25
32
Pre-arcing
I
2
t @ 1 ms
I
2
t
p
(A
2
s)
1.3
1.8
2.4
4.3
6.7
15.0
27.0
53.0
Total Clearing
I
2
t @ U
N
(A
2
s)
Ip
≤
30I
N
Ip > 30I
N
10
13
18
28
41
85
135
240
11
15
20
33
48
100
160
280
Power Losses @
0.8 I
N
0.6
0.7
1.2
1.6
2.0
2.2
2.6
3.0
I
N
1.0
1.2
2.1
2.8
3.5
4.0
4.7
5.4
160kA @ 250V
Tested
Interrupting
rating
LEW : 17x27 without trip indicator
Voltage
U
N
(V)
Size
Ref:
7LEW
10LEW
12LEW
16LEW
20LEW
25LEW
32LEW
35LEW
250
17x27
40LEW
50LEW
63LEW
80LEW
100LEW
125LEW
150LEW
160LEW
180LEW
Micro
Switch
UL
Current
rating
I
N
(A)
7
10
12
16
20
25
30
35
50
60
75
80
100
125
150
160
180
Pre-arcing
I
2
t @ 1 ms
I
2
t
p
(A
2
s)
1.3
4.5
5.9
11.2
15.6
30.0
45.0
63.0
180.0
250.0
380.0
480.0
730.0
850.0
1250.0
1730.0
2090.0
Total Clearing
I
2
t @ U
N
(A
2
s)
8.5
21
27
50
80
130
195
270
790
1100
1670
2100
3350
5720
7930
9600
14500
9.8
23.8
31
59
100
160
235
330
940
1310
1990
2530
4060
6920
9590
11700
17500
Power Losses @
0.56
0.84
1.1
1.7
2.2
2.7
3.2
3.7
4.9
5.8
7.2
7.25
6.5
6.7
7.4
8.8
9.5
1.0
1.5
2.0
3.0
3.9
4.8
5.6
6.5
8.8
10.4
13.6
13.7
11.5
12.3
13.6
15.6
17.0
160 kA @ 250V
Tested
Interrupting
rating
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
Data Sheet. BS88250aR Issue 1
Page 2 of 6
March, 2005
WESTCODE
An
IXYS Company
BS 88 Round Body Fuse - 250V
LEWI : 17x27 with separate trip indicator
Voltage
U
N
(V)
Size
Ref:
7LEWI
10LEWI
12LEWI
16LEWI
20LEWI
25LEWI
32LEWI
35LEWI
250
17x27
40LEWI
50LEWI
63LEWI
80LEWI
100LEWI
125LEWI
150LEWI
160LEWI
180LEWI
Micro
Switch
UL
Current
rating
I
N
(A)
7
10
12
16
20
25
30
35
50
60
75
80
100
125
150
160
180
Pre-arcing
I
2
t @ 1 ms
I
2
t
p
(A
2
s)
1.3
4.5
5.9
11.2
15.6
30.0
45.0
63.0
180.0
250.0
380.0
480.0
730.0
850.0
1250.0
1730.0
2090.0
Total Clearing
I
2
t @ U
N
(A
2
s)
8.5
21
27
50
80
130
195
270
790
1100
1670
2100
3350
5720
7930
9600
14500
9.8
23.8
31
59
100
160
235
330
940
1310
1990
2530
4060
6920
9590
11700
17500
Power Losses @
0.56
0.84
1.1
1.7
2.2
2.7
3.2
3.7
4.9
5.8
7.2
7.25
6.5
6.7
7.4
8.8
9.5
1.0
1.5
2.0
3.0
3.9
4.8
5.6
6.5
8.8
10.4
13.6
13.7
11.5
12.3
13.6
15.6
17.0
160 kA @ 250V
Tested
Interrupting
rating
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Notes: Minimum operating voltage for integrated trip indicator = 20V
Microswitch reference: MC 6.3 GR 2-5 N
Data Sheet. BS88250aR Issue 1
Page 3 of 6
March, 2005
WESTCODE
An
IXYS Company
BS 88 Round Body Fuse - 250V
Electrical Characteristics:
Times vs current characteristics
These curves indicate, for each rated current, the pre-arcing time vs. the RMS pre-arcing current.
Tolerance for the mean pre-arcing current ± 10%
LCW : Size 10x28
Size 10x28
LEW (LEWI with indicator) : Size 17x27 I
≤
80 LEW (LEWI with indicator): Size 17x27 I
≥
100
Size 17x27
< 80
Size 17x27
>100
These curves indicate, for each rated current, the pre-arcing time vs the RMS pre-arcing current.
Tolerance for the mean pre-arcing current +/- 10%
Data Sheet. BS88250aR Issue 1
Page 4 of 6
March, 2005
WESTCODE
An
IXYS Company
BS 88 Round Body Fuse - 250V
Corrective Factor
LCW : Size 10x28
Peak Arc Voltage:
LEW & LEWI : Size 17x27 I
≤
80
LEW & LEWI : Size 17x27 I
≥
100
Corrective factor :
The mean curves show the variance of the total
clearing time (I
2
t) and the total clearing duration
t
t
as a function of operating voltage U.
Peak arc voltage :
This curve shows the peak value Um of the
arc voltage which appears across the fuse
link as a function of the operating
voltage U @ cos
ϕ
= 0.15.
Data Sheet. BS88250aR Issue 1
Page 5 of 6
March, 2005
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