Wirewound Fusible Resistor:

3、Characteristics

Multiple

Times Power Rating

×30   Fusing time
1/2W, 1WS 1Ω~100Ω   Under 60 sec.
1W, 2WS

*Fusing Voltage =Power rating ×Resistance value ×Times

Item Performance Test methodsConform toJIS C 5202)

Temperature Coefficient

±350PPM/℃
(±500PPM/℃<1Ω)

Comply with 5.2

 

R0: Resistance value at room temp.( T0).
R1:Resistance value at room temp.plus 100 (T1)

Short time overload

Within ±(2%+0.05Ω).
No evidence of mechanical damage.

Comply with 5.5
 
Rated voltage×2.5 times,5s
But not to exceed maximum overload voltage. (See table-1)

Insulation Resistance

104MΩ or more.

Comply with 5.6
 
V-block method, Resistor shall be tested at DC 500V for 60 seconds.

Dielectric Withstanding Voltage

No evidence of flashover mechanical damage, arcing  or insulation breakdown.

Comply with 5.7
Constant pressure, V-block method, Resistor shall be tested at AC potential respectively for 60 seconds.(See table-1)

Terminal strength

No evidence of mechanical damage.

Comply with 6.1

Tensile strength

Diameter(mm)

Tensile force N(kg)

Time

Φ0.38mm~0.50mm

5(0.51)

10±1second

Φ0.50mm~0.70 mm

10(1.02)

Torsion strengthTo bend the lead wire at the point of about 6mm~6.5mm from resistor body. about 0.75mm curvature radii to 90°then catch the wire at 1.2±0.4mm apart from the bend point end and turn it ( clockwise ) by 360 degrees perpendicular to the resistor axis at speed of same 5 seconds per turn, and do the same counterclockwise again which constitute a whole turn. Repeat the turn for 2 times without causing any break and looseness.

Resistance to soldering heat

Within ±(1%+0.05Ω)
No evidence of mechanical damage.

Comply with 6.4
350±10,3±1.0s, After test leave for 0.5h.
Solderability

Covered with new solder by 95% at least.

Comply with 6.5
Test temperature of solder: 230±5
Dipping time in solder:3±1.0 s
Resistance to solvent

No deterioration of protective coating and markings.

Comply with 6.9
Specimens shall be immersed in a bath of isoproalcohol completely for 3 minutes with ultrasonic.
Temperature cycle

Within ±(5%+0.05Ω)
No evidence of mechanical damage.

Comply with 7.4
Low side-55/30min, Room temp.10 to 15min
High side80/30min, Room temp.10 to 15min
5 cycles
Load life in humidity

Within ±(5%+0.05Ω)

Comply with 7.9
40±2, 90 to 95%RH, 1000h
Rated voltage (90 min ON, 30 min OFF)
Load life

Within ±(5%+0.05Ω)

Comply with 7.10
70±3, 1000h
Rated voltage (90 min ON, 30 min OFF)
2、Construction
2.5、Indication
    
The indication shall be satisfied with4、Indication
2.4、Resistor body color
    
Table-2
Normal size

Small size

Type Color Type Color
WFR1/2W,WFR1W Gray WFR1WS,WFR2WS Pink
2.3、Terminal caps
           
The caps shall be securely connected with the resistor element electrically and mechanically.
2.2、Structure diagram
No Item Material
1 Ceramic core

High alumina ceramic is used.

2 Resistor element

The resistor element shall consist of Resistance wire(Exemple:CN49W Φ1.0mm) .

3 Terminal Tinned iron cap.
4 Connection The lead wire, which is plated with solder, shall be mounted to the caps by welding process.
5 Lead wire Soldered or tinned annealed wire.
6 Finishing painting Silicon resin is used. Accord with UL-94V-0 Nonflammable specification.
7 Indication Color code.

     The construction of resistor (WFR series) shall be as follows:

 

2.1、External dimensions
            The dimensions shall be satisfied with5、External dimensions
1、General
1.4、Rated voltage
    
The rated voltage shall be the D.C. or A.C.(R.M.S. at power frequency) voltage which corresponds the rated power and the value of which is calculated from the formula below

     E=(PxR)  Where E:Rated voltage(V)   P:Rated power(W)   R: Nominal resistance(Ω)

1.3、Rated power
    
Rated power is maximum power which can be continuously loaded at specified ambient temperature 70,as Table-1;however when the ambient temperature exceeds 70,rated power should be determined from the derating curve of Fig.1.
Figure 1  Power derating curve
Table-1
Type Rated power

Maximum Open Voltage

Dielectric withstanding voltage

Resistance RangeΩ

WFR1/2W 0.5W 250V 350V 0.1Ω~100Ω
WFR1W 1W 250V 400V 0.1Ω~100Ω
         
WFR1WS 1W 250V 350V 0.1Ω~100Ω
WFR2WS 2W 250V 400V 0.1Ω~100Ω

 

1.2、Type designation (example)
    
The type designation shall be in the following form and as specified.

WFR

Type

1/2W

Rated power
Normal Small
1/2W 1WS
1W 2WS

10Ω

Nominal resistance value

E-24 Series

 

±5%

Resistance tolerance

J

±5%

T/B

Form

P Tyepe
MB Type
M Type
MKK Type
F Type
FK Type
FKK Type

 

1.1、Scope
    
This specification is available for Wirewound Fusible Resistor manufactured by FONG YA ELECTRONIC(DONG GUAN)CO.,LTDShould resistor already application the    United States UL Anne rules attestation, file number:E326594.
6、Package
6.2 Tape in box Bulk  (Ammo Bulk)
6.2.2 Packing box size and quantity
Type Form Quantity Dimensions (mm)
Normal Size Small Size L W H
WFR1/2W WFR1WS P 3000 PCS 200 130 80
Molding 5000 PCS 200 130 80
WFR1W WFR2WS P 1000 PCS 200 130 80
Molding 2000 PCS 200 130 80
6.2.1 Indication

  (1)Product specification

     (2)Quantity

6.1 Tape in box packing  (Ammo packing)
6.1.2 Packing box size and quantity
Type Form Quantity Dimensions (mm)
Normal Size Small Size L W H
WFR1/2W WFR1WS T52 2000 PCS 260 80 85
WFR1W WFR2WS T52 1000 PCS 260 80 85
T63 1000 PCS 260 90 85
6.1.1 Indication

   (1)Product specification

   (2)Quantity

 

 

 

 

 

5、External dimensions
5.4 F Type & FK Type& FKK Type
FKK
Watts Dimensions(mm)
D±1.0 L±1.0 P±1.0 E Max H1±1.0 H2±1.0
1/2W,1WS 3.2 9.0 8.0 3.5 5.0 4.0
1W,2WS 4.5 11.0 8.0 3.5 6.0 4.0
FK
Watts

Dimensions(mm)

D±1.0 L±1.0 P±2.0 E Max H±1.0
1/2W,1WS 3.2 9.0 8 3.5 5-8
1W,2WS 4.5 11.0 8 3.5 5-8
F
Watts

Dimensions(mm)

D±1.0 L±1.0 P±2.0 E Max H±1.0
1/2W,1WS 3.2 9.0 8 3.5 5-8
1W,2WS 4.5 11.0 8 3.5 5-8
5.3 MB Type &M Type&MKK Type

MKK

Watts Dimensions(mm)
D±1.0 L±1.0 P±1.0 H±1.0 H1±1.0
1/2W,1WS 3.2 9.0 12.5 7 5
1W,2WS 4.5 11.0 15 7 5
M
Watts

Dimensions(mm)

D L P±1.0 H±1.0
1/2W,1WS 3.2±1.0 9.0±1.0 12.5 8
1W,2WS 4.5±1.0 11.0±1.0 15 10
MB

Watts

Dimensions(mm)

D±1.0 L±1.0 P±1.0 H1±1.0 H2±1.0 t±0.15 qMax
1/2W,1WS 3.2 9.0 12.5 7 5 1.2 3
1W,2WS 4.5 11.0 15 7 5 1.25 3
Type

Taping

Dimensions(mm)

Normal Size Small Size L W P L1-L2
Max.
T Z
Max.
R
Max.
t
Max.
e
Max.
S
Max.
WFR1/2W WFR1WS T52 9.0±1.0 52±1.0 5±0.5 1.0 6±0.5 1.2 0 3.0 0.6 0.5
WFR1W WFR2WS T52 11.0±1.0 52±1.0 5±0.5 1.0 6±0.5 1.2 0 3.0 0.6 0.5
T63 11.0±1.0 63±1.0 5±0.5 1.0 6±0.5 1.2 0 3.0 0.6 0.5

5.2 Axial Lead Taping

5.1 P type

Type

Dimensions(mm)
Normal Size Small Size L D d H
WFR1/2W WFR1WS 9.0±1.0 3.3±1.0 0.52±0.05 25.0±2.0
WFR1W WFR2WS 11.0±1.0 4.3±1.0 0.70±0.05 30.0±2.0

 

4、IndicationColor Code

 

 

Explanation of part number

Product ldentification