2

Non resettable fuses

UMF 250

www.schurter.com /PG01_2

Fuses

Derating Curves

140

130

120

110

100

90

80

70

60

50

40

-60

-40

-20

0

20

40

60

80

100 120 140 160

23

Ambient Temperature [°C]

Pre-Arcing Time

Rated Current In

1.0 x In min.

1.25 x In min. 2.0 x In max. 10.0 x In min. 10.0 x In max.

0.5 A - 8 A

-

60 min

120 s

1 ms

10 ms

10 A

4 h

-

120 s

1 ms

10 ms

Time-Current-Curves

1

10

0.1

0.0001

0.001

0.01

100

1000

10000

0.1

10

1

100

500 mA

630 mA

800 mA

1 A

1.25 A

1.6 A

2 A

2.5 A

3.15 A

4 A

5 A

6.3 A

8 A

10 A

Current in Amperes