Document Number: 28737

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Revision: 21-Feb-08

129

NFR25/25H

Fusible, Non-Flammable Resistors

Vishay BCcomponents

The power that the resistor can dissipate depends on the operating

temperature.

The resistors will fuse without the risk of fire and within an indicated

range of overload. Fusing means that the resistive value of the

resistor increases at least 100 times.

The fusing characteristic is measured under constant voltage.

Maximum dissipation (

function of the ambient temperature (

Derating

Fusing Characteristics

70

100

50

0

0

50

100

155

- 55

(%

10

1

12

4

0

8

t

(s)

16

20

24

NFR25 This graph is based on measured data which may deviate

according to the application. Fusing Characteristics:

≤ 1 Ω

10

1

12

4

0

8

P

t

(s)

NFR25 This graph is based on measured data

which may deviate according to the application.

Fusing Characteristics: 1

Ω ≤ R ≤ 15 Ω

10

1

12

4

0

8

t

(s)

16

20

24

NFR25H This graph is based on measured data

which may deviate according to the application.

Fusing Characteristics:

≤ 1 Ω

10

1

12

4

0

8

t

(s)

NFR25 This graph is based on measured data

which may deviate according to the application.

Fusing Characteristics: 15

Ω ≤ R ≤ 15 kΩ

10

1

12

4

0

8

t

(s)

16

20

24

NFR25H This graph is based on measured data

which may deviate according to the application.

Fusing Characteristic: 1

Ω ≤ R ≤ 15 kΩ