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Document Number: 28737

128

Revision: 21-Feb-08

NFR25/25H

Vishay BCcomponents

Fusible, Non-Flammable Resistors

DIMENSIONS

MARKING

The nominal resistance and tolerance are marked on the

resistor using four coloured bands in accordance with

IEC publication 60062 “Color codes for fixed resistors”.

For ease of recognition a fifth ring is added, which is violet for

type NFR25 and white for type NFR25H.

OUTLINES

leads into holes of two identical gauge plates and moving

these plates parallel to each other until the resistor body is

clamped without deformation (“IEC publication 60294”).

FUNCTIONAL PERFORMANCE

PRODUCT CHARACTERIZATION

Standard values of nominal resistance are taken from the

E24 series for resistors with a tolerance of ± 5 %.

The values of the E24 series are in accordance with

“IEC publication 60063”.

Note:

The maximum permissible hot-spot temperature is 155 °C.

Ø D

Ø d

Outline

DIMENSIONS - resistor types and relevant physical dimensions

TYPE

Ø d

NFR25

2.5

6.5

7.5

0.58 ± 0.05

NFR25H

MASS PER 100 UNITS

TYPE

MASS

(g)

NFR25

20.1

NFR25H

20.1

LIMITING VALUES

TYPE

(V)

LIMITING POWER

(W)

NFR25

250

0.33

NFR25H

350

0.5