Nonflammable Wirewound Painting Resistors

Products

Nonflammable Wirewound Painting Resistors（KNP/NKNP） 

Features

1.Good heat durability, low temperature coefficient, low noise, high load and power, nonflammability.

2.Can be fusible during the stated time for protecting the circuit once working at the required overload voltage.

3.Operating ambient temperature :-55°C~+275°C

4.The surface is nonflammable, the 1/4W~6W coating is gray white and indicate the resistance value by color ring, the 7W or over will indicate the resistance value by lettering and coating is green.

5.Resistance tolerance: ±1%,±2%,±5%,±10%.

Dimensions

Power(KN B)

Dimension（mm）

Resistance range

Dielectric
voltage

D±0.5

L±1

C±1

d±0.05

KN

NKN

1/2W

3.5

9

25

0.65

0.1-150

0.05-10

300V

1W

4.5

10.5

30

0.78

0.1-250

0.05-10

300V

2W

5

15

30

0.78

0.1-300

0.05-15

350V

3W

6

17.5

38

0.78

0.1-1K

0.05-22

400V

5W

8

24

30

0.78

0.1-1.5K

0.05-33

500V

6W

8

24

30

0.78

0.1-2K

0.05-47

500V

7W

8

33

30

0.78

0.1-3K

0.05-47

500V

8W

8

39

30

0.78

0.1-3.3K

0.05-47

500V

10W

8

43

30

0.78

0.1-3.6K

0.05-47

500V

Power(KN  Z)

Dimension（mm）

Resistance range(Ω)

Dielectric
voltage

L±0.5

D±0.5

W±1

H±1

a±0.05

b±0.1

NKN

5W

25

9

14

23

4.5

3

0.1-1.5k

500V

6W

25

9

14

23

4.5

3

0.1-2k

500V

7W

33

9

22

23

4.5

3

0.1-3k

500V

8W

38

9

27

23

4.5

3

0.1-3.3k

500V

10W

43

9

32

23

4.5

3

0.1-3.6k

500V

Note: We can accord customer’s requirements to customize the other fusing characteristics resistors.

Test Item 

Test Condition 

Performance 

Temperature Coefficient

The resistance value at normal temperature and normal temperature added 100°C, calculate per °C resistance value change rate. 

±300ppm/°C

Short Time overload

10×rated voltage or Max. overload voltage(get the lower) for 5 seconds.

ΔR≤±(2%R0+0.05Ω)

Pulse overload

At 4×rated voltage or Max. pulse overload voltage(get the lower)cycle 10000±200times(1second on,25 seconds off).

ΔR≤±(1%R0+0.05Ω)

Resistance to soldering Heat

Immerge into the 350±10°C tin stove for 2~3seconds.

ΔR≤±1%R0

Solderability

Immerge into the 245±3°C tin stove for 2~3seconds.

The soldering area is over 95%

Temperature cycling

At -55°C for 30 min. ,then at+25°C for 10~15°C,then at +125°C for 30 min., then at +25°C for 10~15 min., total 5cycles.

ΔR≤±(1%R0+0.05Ω)

Load life in humidity

Overload rated voltage or Max. working voltage(get the lower) for 1000 hours(1.5hours on and 0.5 hours off) at the 40±2°C and 90~95% relative humidity. 

ΔR≤±(5%R0+0.05Ω)

Load life in heat 

Overload rated voltage or Max. working voltage(get the lower) for 1000 hours(1.5hours on and 0.5 hours off) at the 70±2°C.

ΔR≤±(5%R0+0.05Ω)