绕线熔断保险丝电阻 高精度封闭保险丝电阻

general specifications

normal type

fknr-0207

fknr -0410

fknr -0414

fknr -0617

fknr -0718

rated power

1/4w

1/2w

1w

2w

3w

mini type

fknr-0410s

fknr-0414s

fknr-0617s

fknr-0718s

rated power

1/2ws

1ws

2ws

3ws

standard dimensions (mm)

6± 0.5

9 ± 0.5

11 ± 0.5

15 ± 0.5

17 ± 0.5

body diameter (d)

2.0 ± 0.2

3.2 ± 0.5

4.5 ± 0.5

5 ± 0.5

6 ± 0.5

lead length (h) ± 2

26

26

35

33

32

lead diameter (d) ± 0.05

0.43

0.52

0.65

0.75

0.75

electrical specification

din size

0207

0410

0414

0617

0718

maximum working voltage (v)

200

250

300

350

400

maximum overload voltage (v)

300

400

500

500

600

resistance range ( ±5%(j))

0.1ω-100ω

0.1ω-100ω

0.1ω-100ω

0.1ω-100ω

0.1ω-100ω

characteristics

standard

test methods

1.

 resistance temperature coefficient

 (ppm/℃)

±500ppm/℃

natural resistance change per temperature degree centigrade.

(ppm/℃)

r1: resistance value at reference temperature. (t1)

r2: resistance value at reference temperature. (t2)

t1: room temperature

t2 : t1±100℃

2.

 dielectric

 withstanding

 voltage

 no evidence of flashover, mechanical damage or arcing or, insulation break down.

resistors shall be subjected to an approximately sinusoidal test potential (as below) 60hz applied between both terminals connected together and a  90° v-block extending beyond the end of the resistor.

resistor wattage

dc volts

1/8w  (1/4wsi)

1/4w  (1/2ws)

1/2w  1w,2w above

200

250

500

3.

 solderability

 90% covered min.

the terminal lead shall be dipped into molten solder s at 3.2 to 4.8mm from the body of resistor. the temp. and time as below:

a. 265±5℃ for 2±0.5 seconds

b. 350±10℃ for 2±0.5seconds

4.

 resistance to soldering

no evidence of mechanical damage

△     r/r ±5%

the terminal of the resistor is dipped into the molten solder of 350±10℃ for 3±0.5 seconds. then put the resistor in the room temperature. for min.3 hours.

5.

 humidity load life

±5% max./1000hours

resistance change after 1000 hours ( 1.5 hours on  0.5 hours off)at rated continuous working voltage in a humidity chamber controlled at 40±2℃and 90~95% relative humidity .

6.

load life

±5% max./1000hours

permanent resistance change after 1000 hours  operating at rated continuous working voltage with a duly cycle of 1.5 hours on 0.5 hours off at 70 ± 2℃ ambient .

7.

 temperature cycling

δ r/r at ±1% max. no evidence of mechanical damage.

resistance change after continuous five cycles for duty cycle as specified below.

step

temperature

time

1

-30℃

30 minutes

2

+25℃

10~15 minutes

3

+85℃

30 minutes

4

+25℃

10~15 minutes

characteristics

standard

test methods

8.

 short time   overload

δ r/r at ±2% max. with no evidence of arcing burning, or charring

permanent resistance change after the application of a potential of 2.5 times rated continuous working voltage for 5 seconds at room temperature.

9.

terminal strength

no  evidence  of  mechanical damage or loosening terminals

direct load resistance to 2.5kg direct load 30±5 seconds twist test, for axial leads unit only. terminal lead shall be bent through at a right angle at a point of 6.35mm from the body edge of resistor and shall be rotated through at a right angle about the original axis of the bent terminal in alternating direction for a total 3 rotations.

施加电压倍率

熔断时间

4倍

60 sec

8倍

30 sec

16倍

15 sec