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Features
■ Fuses at 120 V or 240 V
Applications
■ E24 resistance values
■ White goods
■ RoHS compliant*
■ Inverters
UL 1412 recognized
■ Coating material meets UL 94V-0
requirements
■ Lighting
■
■ Metering
FWxxA Series Fusible Power Resistors
General Introduction
The FWxxA Series of axial leaded wirewound resistors is designed to fuse under abnormal conditions such as sudden surges in
voltage or circuit malfunctions. The resistor will fuse upon application of 120 or 240 voltages.
Agency Recognition
Electrical Characteristics
Characteristic
Power
Resistance Range
UL 1412 Recognized Resistance Range
Tolerance
Temperature Coefficient
Operating Temperature Range
Maximum Voltage
Fusing Point
Fusing Time
FW Series
1, 2, 3, 5, 7** W
4.7 ohms to 100 ohms (E24 values)
4.7 ohms to 47 ohms
5%
±200 PPM/°C
-55 °C to +155 °C
√P*R
See Fusing Performance Chart
See Fusing Performance Chart
The resistor will fuse safely if 120 or 240 V is applied. The time to fuse depends on the
resistance value.
** 7 W = 240 Vac only.
Product Dimensions
H
L
H
D
DIMENSIONS:
MM
(INCHES)
d
(DIA.)
Dimensions
Model
D
(Max.)
L
(Max.)
H
d
FW10A (1 W)
5.0
(.197)
12
(.472)
28 ± 3.0
(1.102 ± .118)
0.55 ± 0.05
(.022 ± .002)
FW20A (2 W)
6.0
(.236)
12
(.472)
28 ± 3.0
(1.102 ± .118)
0.65 ± 0.05
(.026 ± .002)
FW30A (3 W)
6.5
(.256)
16
(.630)
28 ± 3.0
(1.102 ± .118)
0.75 ± 0.05
(.030 ± .002)
FW50A (5 W)
7.5
(.295)
18
(.709)
28 ± 3.0
(1.102 ± .118)
0.75 ± 0.05
(.030 ± .002)
FW70A (7 W)
9.5
(.374)
26
(1.024)
38 ± 3.0
(1.496 ± .118)
0.75 ± 0.05
(.030 ± .002)
WARNING Cancer and Reproductive Harm
www.P65Warnings.ca.gov
*RoHS Directive 2015/863, Mar 31, 2015 and Annex.
Specifications are subject to change without notice. Users should verify actual device performance in their specific
applications. The products described herein and this document are subject to specific legal disclaimers as set forth
on the last page of this document, and at www.bourns.com/docs/legal/disclaimer.pdf
Description
UL 1412
File Number: E349323
Materials
Resistor ............... Wire wound around a
ceramic core
Lead Wire ........................Tinned copper
Housing .......................... Insulated resin
Coating Material ...........Meets UL 94V-0
requirements
How to Order
FW 10 A 7R50 J A
Model
FW = Fusible
Wirewound
Rated Power
10 = 1.0 Watts
20 = 2.0 Watts
30 = 3.0 Watts
50 = 5.0 Watts
70 = 7.0 Watts
Pin Style
A = Axial
Resistance Code
• R
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