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| Carbon Film Resistors |
The WC Series Carbon Resistors are manufactured using mechanised high vaccum carbonising plants. This ensures a stable resistive film. the resistors are insulated with layers of light brown lacquer. The WC series offer a wide range of power ratings 0.2W, 0.25W, 0.35W, 0.5W & 1W, 2W, 3W having tolerance ranges of  5% |
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| S p e c i f i c a t i o n s |
| Type No |
WC-12 |
WC-25M |
WC-25 |
WC-50/WC-50M |
WC-100/WC-100M |
WC-200/WC-200M |
WC-300M |
| Rated Power at 70oC |
0.20W |
0.25W |
0.35W |
0.5W |
1W |
2W |
3W |
| Resistance Range (E24 series) |
1 E to 10M |
1 E to 10M |
1 E to 10M |
1 E to 10M |
1 E to 10M |
1 E to 10M |
1 E to 10M |
| Tolerance |
5% |
5% |
5% |
5% |
5% |
5% |
5% |
| Maximum working voltage to 70oc at pressure |
200V |
250V |
250V |
350V |
500V |
500V |
500V |
| Operating Temperature |
-40oC to + 150oC |
-40oC to + 150oC |
-40oC to + 150oC |
-40oC to + 150oC |
-40oC to + 150oC |
-40oC to + 150oC |
-40oC to + 150oC |
| C h a r a c t e r i s t i c s |
| Type No. |
WC - 12 |
WC-25/WC-25M |
WC-50/WC-50M |
WC-100/WC-100M |
WC-200/WC-200M |
WC-300M |
| Dielectric Strength |
450V No break down
 R max. 0.5% |
500V No break down
R max. 0.5% |
700V No break down
R max. 0.5% |
1000V No break down
R max. 0.5% |
1000V No break down
R max. 0.5% |
1000V No break down
R max. 0.5% |
| Terminal Strength |
no damage
R max. 0.5%
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no damage
R max. 0.5%
|
no damage
R max. 0.5%
|
no damage
R max. 0.5%
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no damage
R max. 0.5%
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no damage
R max. 0.5%
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| Resistance to soldering heat (350oC) |
R max.1% |
R max.1% |
R max.1% |
R max.1% |
R max.1% |
R max.1% |
| Solderability |
good tinning
no damage |
good tinning
no damage |
good tinning
no damage |
good tinning
no damage |
good tinning
no damage |
good tinning
no damage |
| Temperature Cycling -40oC to 150oC |
R max.1% |
R max.1% |
R max.1% |
R max.1% |
R max.1% |
R max.1% |
| Life 1000 hours at rated Power |
R max. 3% |
R max. 3% |
R max. 3% |
R max. 3% |
R max. 3% |
R max. 3% |
| Short time overloaded |
R max.1% |
R max.1% |
R max.1% |
R max.1% |
R max.1% |
R max.1% |
| Vibration |
no damage
R max. 0.5%
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no damage
R max. 0.5%
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no damage
R max. 0.5%
|
no damage
R max. 0.5%
|
no damage
R max. 0.5%
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no damage
R max. 0.5%
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| Resistance to solvents |
no damage |
no damage |
no damage |
no damage |
no damage |
no damage |
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| Standard Resistance Values |
| E 24 S e r i e s |
| 10 |
11 |
12 |
13 |
15 |
16 |
18 |
20 |
22 |
24 |
27 |
30 |
| 33 |
36 |
39 |
43 |
47 |
51 |
56 |
62 |
68 |
75 |
82 |
91 |
| D i m e n s i o n s i n m m |
| TYPE WM 12/WM 25M |
H = 28 1 |
L = 3.4 0.2 |
D = 1.8 0.1 |
d = 0.48 0.02 |
| TYPE WM 25/WM 50M |
H = 28 1 |
L = 6.0 0.4 |
D = 2.3 0.1 |
d = 0.55 0.02 |
| TYPE WM 50/WM 100M |
H = 28 1 |
L = 9.5 0.5 |
D = 3.2 0.2 |
d = 0.6 0.02 |
| TYPE WM 100/WM 200M |
H = 28 1 |
L = 11 1.0 |
D = 4.3 0.5 |
d = 0.7 0.04 |
| TYPE WM 200 |
H = 28 1 |
L = 16 1.0 |
D = 5.0 0.5 |
d = 0.8 0.04 |
| TYPE WM 300M |
H = 28 1 |
L = 16 1.0 |
D = 5.0 0.5 |
d = 0.8 0.04 |
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| Colour |
1st Figure |
2nd Figure |
multiplier |
Tolerance |
| Black |
0 |
0 |
0 |
|
| Brown |
1 |
1 |
10 |
1% |
| Red |
2 |
2 |
100 |
2% |
| Orange |
3 |
3 |
1,000 |
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| Yellow |
4 |
4 |
10,000 |
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| Green |
5 |
5 |
100,00 |
0.5% |
| Blue |
6 |
6 |
1,000,000 |
0.25% |
| Violet |
7 |
7 |
10,000,000 |
0.1% |
| Gray |
8 |
8 |
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| White |
9 |
9 |
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| Gold |
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|
0.1 |
5% |
| Silver |
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0.01 |
10% |
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