WF
thermal fuse built-in resistors
EU
features
•
Marking: Ceramic body with alpha/numeric marking
•
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
H
Type
WF5N
WF7N
WF10N
4.5
+2
-1
P
ød
W
D
Dimensions
inches
(mm)
H
P
d (R. Lead) d (Fuse Lead)
Thermal Fuse
Resistor
1.00±.059
+.079
.512±.039 .354±.039
(25.5±1.5)
.197
-.039
(13.0±1.0) (9.0±1.0)
1.52±.059
(5
+2
)
-1
(38.5±1.5)
+.079
.630±.039 .472±.039 1.38±.059 .295
-.039
+2
(16.0±1.0) (12±1.0)
(35±1.5)
(7.5
-1
)
.031
(0.8)
2A: 0.6
10A: 1.0
Lead Wire
ordering information
New Part #
WF
Type
5N
Style
5N
7N
10N
C
Terminal Surface
Temperature
C: SnCu
8
Thermal Fuse
Symbol
See table
below
G
Resistor
Material
G: Glass core
wire wound
S: Metal oxide
film
100
Nominal
Resistance
3 digits
K
Resistance
Tolerance
J: ±5%
K: ±10%
applications and ratings
Thermal
Fuse
Symbol
8
10
12
14
32
33
34
35
Thermal Fuse
Thermal
Current
Cut-off Temp. Rating
129±2 (STD)
152±2
+3
188
-1
+1
226
-3
110±2
126±2
130±2 (STD)
+3
146
-2
Voltage
Rating
5N
1.6
1.6
2.0
2.0
1.2
1.4
1.6
1.6
Power Rating
(W)
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
Resistance
Tolerance
Maximum
Working
Voltage
Maximum
Overload
Voltage
G: Glass S: Metal G: Glass S: Metal
Core
Oxide
Core
Oxide
Wirewound
Film
Wirewound
Film
10A
250V
2A
1 - 100
(E24)
110 - 10k
J: ±5%
(E24)
K: ±10%
J: ±5%
E=
√
P • R
√
P • R • 6.25
E=
* Other combination of thermal cut-off temperatures and resistance values are available on request
Specifications given herein may be changed at any time without prior notice. Please confirm technical specifications before you order and/or use.
1/06/09
KOA Speer Electronics, Inc.
• 199 Bolivar Drive • Bradford, PA 16701 • USA • 814-362-5536 • Fax: 814-362-8883 • www.koaspeer.com
185
circuit
protection
KOA [ KOA SPEER ELECTRONICS, INC. ]
