Date:- 18 Mar, 2005
Data Sheet Issue:- 1
Ultra Rapid
Semiconductor Protection Fuse
BS 88 Round Body Type Fuses
British Standard BS88-4
Voltage Rating 250V
Current Ratings from 50A to 1050A
gR and aR Characteristics
Sizes 36x27 & 2x36x27
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 with current ratings from 50A to 350A (LMW & LMWI) and 300A to 700A (LMMW
& LMMWI) in accordance with VDE 636-23 and IE 60269.4 standards
aR Characteristics with current ratings from 400 to 525A (LMW & LMWI) and 800A to 1050A (LMMW
& LMMWI) in accordance with VDE 636-23 and EC 60269.4 standards
Models available with or without separate trip indicator
Microswitch MC 6.3 GR 2-5N for fuses with separate trip indicator
Data Sheet xLMW & xLMMW
Issue 1
Page 1 of 6
March, 2005
WESTCODE
An
IXYS Company
BS 88 Round Body Fuses - 250V
Main Characteristics:
LMW : Size 36x27 without indicator
Voltage
U
N
(V)
Size
Ref:
50LMW
75LMW
100LMW
125LMW
160LMW
200LMW
250
36x27
250LMW
315LMW
355LMW
400LMW
450LMW
500LMW
525LMW
Micro
Switch
N
N
N
N
N
N
N
N
N
N
N
N
N
Current
rating
I
N
(A)
50
75
100
125
150
200
250
300
350
400
450
500
525
Pre-arcing
I
2
t @ 1 ms
I
2
t
p
(A
2
s)
120
330
745
1340
1930
4020
5350
7290
18000
25100
33500
43000
48200
Total Clearing
I
2
t @ U
N
(A
2
s)
500
1380
3060
5500
7950
16400
30000
49600
74000
128000
170000
219000
245000
Power Losses @
0.8 I
N
4.75
6.3
7.8
9.1
10.8
13.5
16.3
18.6
21
23.4
27.1
30.4
33.2
I
N
9.5
12.6
15.7
18.2
21.6
27
32.6
37.2
42,0
46.7
54.1
60.8
66.4
100kA @ 250V
Tested
Interrupting
rating
LMWI : Size 36x27 with separate trip indicator
Voltage
U
N
(V)
Size
Ref:
50LMWI
75LMWI
100LMWI
125LMWI
160LMWI
200LMWI
250
36x27
250LMWI
315LMWI
355LMWI
400LMWI
450LMWI
500LMWI
Micro
Switch
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Current
rating
I
N
(A)
50
75
100
125
150
200
250
300
350
400
450
500
Pre-arcing
I
2
t @ 1 ms
I
2
t
p
(A
2
s)
120
330
745
1340
1930
4020
5350
7290
18000
25100
33500
43000
Total Clearing
I
2
t @ U
N
(A
2
s)
500
1380
3060
5500
7950
16400
30000
49600
74000
128000
170000
219000
245000
Power Losses @
0.8 I
N
4.75
6.3
7.8
9.1
10.8
13.5
16.3
18.6
21
23.4
27.1
30.4
33.2
I
N
9.5
12.6
15.7
18.2
21.6
27
32.6
37.2
42,0
46.7
54.1
60.8
66.4
100kA @ 250V
Tested
Interrupting
rating
Y
525
48200
525LMWI
Notes: Minimum operating voltage for integrated trip indicator = 20V
Microswitch reference MC 6.3 GR 2-5N
Data Sheet. xLMW & xLMMW
Issue 1
Page 2 of 6
March, 2005
WESTCODE
Voltage
U
N
(V)
An
IXYS Company
BS 88 Round Body Fuses - 250V
LMMW : Size 2x36x27 without trip indicator
Size
Ref:
315LMMW
355LMMW
400LMMW
500LMMW
250
2x36x27
630LMMW
710LMMW
800LMMW
900LMMW
1000LMMW
1050LMMW
Micro
Switch
N
N
N
N
N
N
N
N
N
N
Current
rating
I
N
(A)
300
350
400
500
600
700
800
900
1000
1050
Pre-arcing
I
2
t @ 1 ms
I
2
t
p
(A
2
s)
7700
11500
16000
29100
48200
72000
100000
134000
172000
193000
Total Clearing
I
2
t @ U
N
(A
2
s)
31800
48700
65600
120000
198500
276000
512000
680000
876000
980000
Power Losses @
21.6
24.3
27
32.6
37.2
42
46.7
54.1
60.8
66.4
43.2
48.6
54
65.2
74.4
84
93.4
108.2
121.6
132.8
100kA @ 250V
Tested
Interrupting
rating
LMMWI : Size 2x36x27 with trip indicator
Voltage
U
N
(V)
Size
Ref:
315LMMWI
355LMMWI
400LMMWI
500LMMWI
250
2x36x27
630LMMWI
710LMMWI
800LMMWI
900LMMWI
1000LMMWI
Micro
Switch
Y
Y
Y
Y
Y
Y
Y
Y
Y
Current
rating
I
N
(A)
300
350
400
500
600
700
800
900
1000
Pre-arcing
I
2
t @ 1 ms
I
2
t
p
(A
2
s)
7700
11500
16000
29100
48200
72000
100000
134000
172000
Total Clearing
I
2
t @ U
N
(A
2
s)
31800
48700
65600
120000
198500
276000
512000
680000
876000
980000
Power Losses @
21.6
24.3
27
32.6
37.2
42
46.7
54.1
60.8
66.4
43.2
48.6
54
65.2
74.4
84
93.4
108.2
121.6
132.8
100kA @ 250V
Tested
Interrupting
rating
y
1050
193000
1050LMMWI
Notes: Minimum operating voltage for integrated trip indicator = 20V
Microswitch reference MC 6.3 GR 2-5N
Data Sheet. xLMW & xLMMW
Issue 1
Page 3 of 6
March, 2005
WESTCODE
An
IXYS Company
BS 88 Round Body Fuses - 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%
Size 36x27 I
≤
350
LMW & LMWI
36x27
Size 36x27 I
≥
400
LMW & LMWI
36x27
Size 2x36x27 I
≤
700
LMMW & LMMWI
2x36x27
Size 2x36x27 I
≥
800
LMMW & LMMWI
2x36x27
Data Sheet. xLMW & xLMMW
Issue 1
Page 4 of 6
March, 2005
WESTCODE
An
IXYS Company
BS 88 Round Body Fuses - 250V
Corrective Factor
Size 36x27 I
≤
350 (LMW & LMWI)
Peak Arc Voltage
Size 36x27 I
≥
400 (LMW & LMWI)
Size 2x36x27 I
≤
700 (LMMW & LMMWI)
Size 2x36x27 I
≥
800 (LMMW & LMMWI)
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. xLMW & xLMMW
Issue 1
Page 5 of 6
March, 2005
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