Resistors
WIRE WOUND FUSIBLE RESISTORS
The WWF series wire wound fusible resistors are manufactured to perform as a regular resistor under normal conditions and as a fuse under excessive load.
In WWF series, resistors up to 5W, the resistance value is colour coded with 3 bands plus a tolerance band. An additional white band indicates that the resistor is fusible. For resistors 6W and above, the value is printed on the resistor.
MPN
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SPECIFICATION |
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| Type | Wattage | DIMENSIONS IN MM |
Range in OHMS [Ω] | Tolerance | Dielectric withstanding Voltage | ||||
| D | L | H | d | ||||||
WWF 1 WWF 2 M |
1W / 2W | 3.20 ± 0.5 | 9 ± 0.5 | 26 ±2.0 | 0.55 ± 0.05 | 0.1 | 150 | 5% | 350 V |
WWF 2 WWF 3 M |
2W / 3W | 4.25 ± 0.5 | 11 ± 1.0 | 26 ± 2.0 | 0.65 ± 0.05 | 10 | 150 | 5% | 500 V |
WWF 3 WWF 4 M |
3W / 4W | 5 ± 0.5 | 15 ± 1.0 | 26 ±2.0 | 0.75 ± 0.05 | 10 | 150 | 5% | 500 V |
WWF 5 WWF 6 M |
5W / 6W | 6 ± 0.5 | 18 ± 1.0 | 30 ± 2.0 | 0.75 ± 0.05 | 10 | 150 | 5% | 500 V |
WWF 6 WWF 7 M WWF 8 MM |
6W / 7W / 8W | 8 ± 1.0 | 25 ± 1.0 | 38 ± 3.0 | 0.80 ± 0.05 | 10 | 150 | 5% | 500 V |
WWF 9 WWF 10 M |
9W / 10W | 8 ± 1.0 | 30 ± 1.0 | 38 ± 3.0 | 0.80 ± 0.05 | 10 | 150 | 5% | 1000 V |
‘M’ under ‘Type No.’ denotes miniature size
FUSING CHARACTERISTICS |
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| RESISTANCE RANGE | FUSING POWER | FUSING TIME | TCR | ||||||
1 Ω to 150 Ω |
Rated power x 32 | < 60 seconds | ±100ppm/°C | ||||||
| Tests | Condition | Spec |
|---|---|---|
| Resistance Temp. Coeff. | -55°C ~ 200°C | ±300ppm/°C |
| Short Time Overload | 5 times of rated wattag e for 5 sec for upto 3w 10 times of rated wattage for 5 sec. above 3w |
±2% |
| Rated Load | Rated voltage for 30 min. | ± 0.5% |
| Insulation Resistance | 500 V megger | 1,000MΩ |
| Load Life | 70°C on-off cycle 1,000hrs. | ±3% |
E 24 Series
| 10 | 11 | 12 | 13 | 15 | 16 | 18 | 20 | 22 | 24 | 27 | 30 |
| 33 | 36 | 39 | 43 | 47 | 51 | 56 | 62 | 68 | 75 | 82 | 91 |
| Colour | lst figure | 2nd figure | Multiplier | Tolerance |
|---|---|---|---|---|
| Black | 0 | 0 | 1 | |
| Brown | 1 | 1 | 10 | ± 1% |
| Red | 2 | 2 | 100 | ± 2% |
| Orange | 3 | 3 | 1,000 | |
| Yellow | 4 | 4 | 10,000 | |
| Green | 5 | 5 | 100,000 | ± 0.5% |
| Blue | 6 | 6 | 1,000,000 | ± 0.25% |
| Violet | 7 | 7 | 10,000,000 | ± 0.1% |
| Gray | 8 | 8 | ||
| White | 9 | 9 | ||
| Gold | 0.1 | ± 5% | ||
| Silver | 0.01 | ± 10% |
Electronic Products
Ohm's Law Calculator
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Voltage (V) = Current (I) * Resistance (R)
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