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.

Description

SPECIFICATION
Type	Wattage	DIMENSIONS IN MM				Range in OHMS [Ω]		Tolerance	Dielectric withstanding Voltage
Type	Wattage	D	L	H	d	Range in OHMS [Ω]		Tolerance	Dielectric withstanding Voltage
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%