![20111
8
WIRE WOUND FUSIBLE RESISTOR - HIGH SURGE IMMUNITY
INTRODUCTION:
The WWFHS series wire wound fusible high surge immune resistors are manufactured
to perform as a regular resistor under normal conditions and as a fuse under excessive
load. These fusible resistors have high surge voltage immunity.
In WWFHS series, for resistors up to 5W, the resistance value is color 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.
* Certified to UL 1412
Note: Resistance range mentioned above is standard range. Please contact us for any
specific resistance value outside the specified range. Also for any specific lead length.
SPECIFICATIONS
Type No. Wattage
Dimensions in mm Range
in
Ohms
[Ω]
Tolerance
Dielectric
withstanding
Voltage
D L H d
WWFHS 1*
WWFHS 2 M 1W / 2W 3.20 ± 0.5 9 ± 0.5 26 ± 2.0 0.55 ± 0.05 10 150 5% 350 V
WWFHS 2*
WWFHS 3 M 2W / 3W 4.25 ± 0.5 11 ± 1.0 26 ± 2.0 0.65 ± 0.05 10 150 5% 500 V
WWFHS 3
WWFHS 4 3W / 4W 5.00 ± 0.5 15 ± 1.0 26 ± 2.0 0.75 ± 0.05 10 150 5% 500 V
WWFHS 5
WWFHS 6 M 5W / 6W 6.00 ± 0.5 18 ± 1.0 30 ± 2.0 0.75 ± 0.05 10 150 5% 500 V
WWFHS 5 B
WWFHS 6 B
WWFHS 7 B
5W / 6W / 7W 7.00 ± 0.5 21 ± 1.0 38.5 ± 2.0 0.75 ± 0.05 10 150 5% 500 V
WWFHS 6
WWFHS 7
WWFHS 8
6W / 7W / 8W 8.00 ± 1.0 25 ± 1.0 38 ± 3.0 0.80 ± 0.05 10 150 5% 500 V
WWFHS 9
WWFHS 10
9W / 10W 8.00 ± 1.0 30 ± 1.0 38 ± 3.0 0.80 ± 0.05 10 150 5% 1000
TECHNICAL SPECIFICATIONS
PARAMETER UNIT RESISTOR CHARACTERISTICS
Temperature Coefficient ppm/°C ± 200
Short Time Overload
- 5 times of rated wattage for 5 sec for up to 3w
10 times of rated wattage for 5 sec. above 3w
Maximum Working Voltage V
Operating Temperature Range °C Characteristic V = -65 to +350
Power Rating - *Refer Power Derating Curve](https://image.slidesharecdn.com/serieswwfhsrev04-007hswirewoundfusibleresistors-210129091527/85/watts-wire-wound-fusible-resistors-high-surge-immunity-series-wwfhs-1-320.jpg)
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Wire Wound Fusible Resistor Technical Specifications
- 1. 20111 8 WIRE WOUND FUSIBLE RESISTOR - HIGH SURGE IMMUNITY INTRODUCTION: The WWFHS series wire wound fusible high surge immune resistors are manufactured to perform as a regular resistor under normal conditions and as a fuse under excessive load. These fusible resistors have high surge voltage immunity. In WWFHS series, for resistors up to 5W, the resistance value is color 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. * Certified to UL 1412 Note: Resistance range mentioned above is standard range. Please contact us for any specific resistance value outside the specified range. Also for any specific lead length. SPECIFICATIONS Type No. Wattage Dimensions in mm Range in Ohms [Ω] Tolerance Dielectric withstanding Voltage D L H d WWFHS 1* WWFHS 2 M 1W / 2W 3.20 ± 0.5 9 ± 0.5 26 ± 2.0 0.55 ± 0.05 10 150 5% 350 V WWFHS 2* WWFHS 3 M 2W / 3W 4.25 ± 0.5 11 ± 1.0 26 ± 2.0 0.65 ± 0.05 10 150 5% 500 V WWFHS 3 WWFHS 4 3W / 4W 5.00 ± 0.5 15 ± 1.0 26 ± 2.0 0.75 ± 0.05 10 150 5% 500 V WWFHS 5 WWFHS 6 M 5W / 6W 6.00 ± 0.5 18 ± 1.0 30 ± 2.0 0.75 ± 0.05 10 150 5% 500 V WWFHS 5 B WWFHS 6 B WWFHS 7 B 5W / 6W / 7W 7.00 ± 0.5 21 ± 1.0 38.5 ± 2.0 0.75 ± 0.05 10 150 5% 500 V WWFHS 6 WWFHS 7 WWFHS 8 6W / 7W / 8W 8.00 ± 1.0 25 ± 1.0 38 ± 3.0 0.80 ± 0.05 10 150 5% 500 V WWFHS 9 WWFHS 10 9W / 10W 8.00 ± 1.0 30 ± 1.0 38 ± 3.0 0.80 ± 0.05 10 150 5% 1000 TECHNICAL SPECIFICATIONS PARAMETER UNIT RESISTOR CHARACTERISTICS Temperature Coefficient ppm/°C ± 200 Short Time Overload - 5 times of rated wattage for 5 sec for up to 3w 10 times of rated wattage for 5 sec. above 3w Maximum Working Voltage V Operating Temperature Range °C Characteristic V = -65 to +350 Power Rating - *Refer Power Derating Curve
- 2. 20111 8 * Please contact us for specific surge voltage requirements. Eg: WWFHSR1005R68C0350 = 1W 5% 68E Wire Wound Fusible Resistor – High Surge Immunity with 3.5KV Surge The surge handling capability is based upon applying an exponential open circuit voltage waveform according to specification IEC 61000-4-5(1.2 µs/50 µs) as shown below at an ambient temperature of 25°C. FUSING CHARACTERISTICS RESISTANCE RANGE FUSING POWER FUSING TIME TCR 10E to 150E Rated Power x 32 < 60 seconds ± 200 ppm/°C ELECTRICAL PERFORMANCE Tests Condition Spec. Surge Immunity Test 5 pulses at 2 Ohms impedance in asynchronous mode 2.5KV * ResistanceTemp.Coeff. -55 °C ~ 200 °C ± 200 ppm/°C Short Time Overload 5 times of rated wattage for 5 sec for up to 3w 10 times of rated wattage for 5 sec. above 3w ± 2% Insulation Resistance 500 V Megger 1,000 MΩ Load Life 70°C on-off cycle 1,000hrs. ± 3% PART NUMBER INFORMATION Watts Type Wire Wound Fusible Resistors High Surge Immunity Size R = Standard M = Miniature B = Special Rated Power 100 = 1W 200 = 2W 300 = 3W 500 = 5W 600 = 6W 700 = 7W 800 = 8W 900 = 9W 10W = 10W Tolerance 1 = 1% 5 = 5% Units R = Ohms K = Kilo Ohms M = Mega Ohms Resistance Value (Decimal value is optional) Surge C0250 = 2.5 KV C0300 = 3 KV ……. C2000 = 20 KV WWFHS R 100 5 R 68 C0350 HIGH VOLTAGE SURGE
- 3. 20111 8 The recommended storage conditions are in between 10°C and 30°C (room temperature) at a relative humidity in between 35 % and 75 %. Do not store them within the vicinity of any corrosive gases such as hydrogen sulphide, sulphurous acid, chlorine or ammonium. 10 11 12 13 15 16 18 20 22 24 27 30 33 36 39 43 47 51 56 62 68 75 82 91 STANDARD RESISTANCE VALUES E24 Series DERATING STORAGE CONDITIONS 040220 Rev 04