WIRE WOUND FUSIBLE RESISTOR – HIGH SURGE IMMUNITY

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.

Description

SPECIFICATION
Type No.	Wattage	DIMENSIONS IN MM				Range in OHMS [Ω]		Tolerance	Dielectric withstanding Voltage
Type No.	Wattage	D	L	H	d	Range in OHMS [Ω]		Tolerance	Dielectric withstanding Voltage
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 M	3W / 4W	5.00 ± 0.5	15.00 ± 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	18.00 ± 1.0	30 ±2.0	0.75 + 0.05	10	150	5%	500 V
WWFHS 6 WWFHS 7 M WWFHS 8 MM	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 M	9W / 10W	8.00± 1.0	30 + 1.0	38 ±3.0	0.80 ± 0.05	10	150	5%	1000 V

‘M’ under ‘Type No.’ denotes miniature size.

+Certified to UL 1412

FUSING CHARACTERISTICS
RESISTANCE RANGE	FUSING POWER	FUSING TIME
10 Ω to 150 Ω	Rated power x 32	< 60 seconds

ELECTRICAL PERFORMANCE

Tests	Condition	Spec
Surge Immunity Test	5 pulses at 2 Ohms impedance in asynchronous mode	2.5KV *
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%

* Please contact us for specific surge voltage requirements.

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%