Standard for Safety : Universal Modular Fuse-Links(UMF)
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1.Characteristic of UMF-standard
The UMF standard (IEC 60127-4 Universal Modular Fuse-links) is an international standard applicable to PCBs of the through hole and surface mounting types respectively.
UL has also approved UMF-standard fuses, eliminating the inconvenience of using different fuses in accordance with differing safety standards between Europe and North America as before.
Daito products include BE,SBE,SBM, BL and SBL
fuses conforming to the UMF standard.
The Details are here.
The Details are here.
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2.The details of standard
The details of standard are shown below. |
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Standard for Safety : Universal Modular Fuse-Links (UMF) |
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Standard |
IEC60127-4 3rd edition |
SS1 |
SS2 |
Shape |
Through-hole fuse-links Table1 |
Surface mount fuse-links Table2 |
Rated Voltage |
32-250V |
12.5-250V |
Rated Current |
0.032-10A |
Carrying Capacity |
125% 1h *1 |
Clearing time |
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FF |
F |
T |
TT |
125% |
1h minimum |
1h minimum |
1h minimum |
1h minimum |
200% |
2min maximum |
2min maximum |
2min maximum |
2min maximum |
1000% |
0.001s maximum |
0.001-0.01s |
0.01-0.1s |
0.1s-1s |
Temperature rise |
125% x In *1*2 dT<=70K |
Short circuit |
V < 125V: 35A or 10 x In *2
V > 125V: 50A or 10 x In *2
250V low-breaking capacity: 100A
250V intermediate-breaking capacity: 500A
250V high-breaking capacity: 1500A |
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*1 Testing after Cyclic current-carrying-test of 100cycle at 105%-1h 0%-15min
*2 In=Rated current
*3 V=Rated voltage
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| Table1 Through-hole fuse-links |
Rated Voltage
V
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Terminal spacing
mm
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Maximum dimensions mm |
W
(width)
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H
(height)
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L
(length) |
32
63
125
250(low-breaking capacity)
250(intermediate-breaking capacity)
250(high-breaking capacity)
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2.5 ± 0.1
2.5 ± 0.1
5 ± 0.1
7.5 ± 0.15
10 ± 0.15
12.5 ± 0.15
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7.5 |
10 |
8
8
10.5
12.5
15
18
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| Table2 Surface mount fuse-links |
Rated Voltage
V
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Minimum Terminal spacing
mm
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Maximum dimensions mm
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W
(width)
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H
(height)
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L
(length)
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12.5
25
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0.4
0.45
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1.8
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2.5
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3.4
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32
50
63
125 |
0.48
0.53
1.1
1.3 |
6 |
5 |
6
8
8
10 |
250(low-breaking capacity)
250(intermediate-breaking capacity)
250(high-breaking capacity) |
4
4
4 |
Under consideration |
12.5
15.8
18 |
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