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WIRE WOUND RESISTORS - HIGH SURGE IMMUNITY
WIRE WOUND RESISTORS - HIGH SURGE IMMUNITY
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WIRE WOUND FUSIBLE RESISTOR - HIGH SURGE IMMUNITY
WIRE WOUND FUSIBLE RESISTOR - HIGH SURGE IMMUNITY

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.

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Description

SPECIFICATION
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
RESISTANCE RANGE FUSING POWER FUSING TIME TCR
1 Ω to 150 Ω Rated power x 32 < 60 seconds ±100ppm/°C
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ELECTRICAL PERFORMANCE

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 3w10 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%
STANDARD RESISTANCE VALUES
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%

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