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Standard for Safety : Universal Modular Fuse-Links(UMF)
 

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.

 
     
  2.The details of standard 

The details of standard are shown below.
 
     
  Standard for Safety : Universal Modular Fuse-Links (UMF)  
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


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
 
*1 Testing after Cyclic current-carrying-test of 100cycle at 105%-1h 0%-15min
*2 In=Rated current
*3 V=Rated voltage
 
Table1 Through-hole fuse-links
Rated Voltage
V
Terminal spacing
mm
Maximum dimensions mm
W
(width)

H
(height)

L
(length)
32
63
125
250(low-breaking capacity)
250(intermediate-breaking capacity)
250(high-breaking capacity)
2.5 ± 0.1
2.5 ± 0.1
5 ± 0.1
7.5 ± 0.15
10 ± 0.15
12.5 ± 0.15
7.5
10
8
8
10.5
12.5
15
18
 
Table2 Surface mount fuse-links
Rated Voltage
V
Minimum Terminal spacing
mm
Maximum dimensions mm
W
(width)

H
(height)

L
(length)
12.5
25
0.4
0.45
1.8
2.5
3.4
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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