NOT RECOMMENDED FOR NEW DESIGN
WF
EU
resistors
thermal fuse built-in resistor
features
•
Wide resistance range and thermal cut-off temperature
•
Resistor with quick current break ability for cement resistor
and thermal fuse
•
Products with lead-free terminations meet EU RoHS
requirements. Pb located in glass material, electrode
and resistor element is exempt per Annex 1, exemption
5 of EU directive 2005/95/EC
dimensions and construction
W
D
Ceramic Case
Cement
Thermal Fuse
Resistor
Lead Wire
P
4.5
+2
-1
ordering information
WF
Type
5N
Style
5N
7N
10N
EOL
Type
W
D
WF5N
WF7N
.512±.039
(13.0±1.0)
H
WF10N
.630±.039
(16.0±1.0)
Dimensions
inches
(mm)
d ±0.1
H
P
(R. Lead)
1.00±.059
+.079
.354±.039
(25.5±1.5)
.197
-.039
(9.0±1.0)
1.52±.059
(5
+2
)
-1
.031
(38.5±1.5)
(0.8)
+.079
.295
-.039
.472±.039 1.38±.059
+2
(12±1.0)
(35±1.5)
(7.5
-1
)
d ±0.1
(Fuse Lead)
2A: 0.6
10A: 1.0
ød
C
8
G
100
K
Resistance
Tolerance
J: ±5%
K: ±10%
Terminal Surface
Temperature
C: SnCu
Thermal Fuse
Symbol
See table below
Resistor
Material
G: Glass core
wire wound
S: Metal oxide
film
Nominal
Resistance
2 significant figures
+ 1 multiplier “R”
indicates decimal
on values <10Ω
applications and ratings
Thermal
Fuse
Symbol
8
10
12
14
32
33
34
35
Thermal Fuse
Thermal
Current
Cut-off Temp. Rating
129±2
+1
150
-3
+3
188
-1
227±2
110±2
+3
126
-2
129±3
+3
146
-2
Voltage
Rating**
Power Rating
(W)
5N
1.6
1.6
2.0
2.0
1.2
1.4
1.6
1.6
7N
2.0
2.0
2.4
2.4
1.4
1.6
2.0
2.0
10N
2.5
2.5
3.5
3.5
––
––
––
––
Resistance Range/
Material (Ω)
Resistance
Tolerance
Maximum
Working
Voltage
Maximum
Overload
Voltage
Operating
Temperature
Range
G: Glass S: Metal G: Glass S: Metal
Core
Oxide
Core
Oxide
Wirewound
Film
Wirewound
Film
10A
AC
250V
2A
1 - 100
(E24)
110 - 10k
J: ±5%
(E24)
K: ±10%
J: ±5%
-20°C~+89°C
-20°C~+100°C
-20°C~+133°C
E=
E=
√
P • R
√
P • R • 6.25 -20°C~+147°C
-20°C~+75°C
-20°C~+91°C
-20°C~+95°C
-20°C~+105°C
* Other combinations of thermal cut-off temperatures and resistance values are available on request
** Rated Voltage of Resistors=
√
Power Rating x Resistance Value.
Specifications given herein may be changed at any time without prior notice. Please confirm technical specifications before you order and/or use.
12/20/17
KOA Speer Electronics, Inc.
• 199 Bolivar Drive • Bradford, PA 16701 • USA • 814-362-5536 • Fax: 814-362-8883 • www.koaspeer.com
227
NOT RECOMMENDED FOR NEW DESIGN
WF
thermal fuse built-in resistor
resistors
environmental applications
Derating Curve
100
Percent Rated Power
(%)
Temp. Symbol
100
Percent Rated Power
(%)
Temp. Symbol
80
60
10˚
80
60
40
20
0
33˚
32˚
-25
-20
25
20
35˚
34˚
40
20
8˚
14˚
12˚
133 147
120
140
160
0
-25
-20
0
25
20
75
40
60
89 100
80
100
0
40
60
68 75 91 95 105
80
100 120
140
160
Ambient Temperature
(˚C)
Ambient Temperature
(˚C)
Temperature Rise
T
200
Temperature Rise (deg)
P
150
100
50
0
2
4
Load Power (W)
Performance Characteristics
Parameter
Resistance
T.C.R.
Overload (Short Time)
Resistance to Soldering Heat
Moisture Resistance
Load Life
EOL
5N
7N
10N
Measuring Point
6
8
For resistors operated at an ambient temperature of 25°C or above, a
power rating shall be derated in accordance with the above rating curves.
Requirement
∆
R ±(%+0.05Ω)
Limit
Typical
Within specified
—
tolerance
±250 x 10
-6
/K (G)
—
±300 x 10
-6
/K (S)
±2%
±1%
±5%
±5%
±0.5%
±0.3%
±2%
±2%
Test Method
25°C
+25°C/-55°C and +25°C/+125°C*
Rated voltage x 6.25 for 5 seconds
350°C ± 10°C, 3.5 seconds
40°C, 90% - 95% RH, 500 hours, No load
Rated voltage, 25°C, 1000 hours, 1.5 hr ON, 0.5 hr OFF cycle
* The upper limit of Operating Temperature Range or 125°C, whichever is lower
Specifications given herein may be changed at any time without prior notice. Please confirm technical specifications before you order and/or use.
12/20/17
228
KOA Speer Electronics, Inc.
• 199 Bolivar Drive • Bradford, PA 16701 • USA • 814-362-5536 • Fax: 814-362-8883 • www.koaspeer.com
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