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ULW4 参数 Datasheet PDF下载

ULW4图片预览
型号: ULW4
PDF下载: 下载PDF文件 查看货源
内容描述: UL认证线绕电阻器 [UL Recognised Wirewound Resistors]
分类和应用: 电阻器线绕电阻器
文件页数/大小: 4 页 / 246 K
品牌: WELWYN [ WELWYN COMPONENTS LIMITED ]
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UL Recognised
Wirewound Resistors
ULW Series
Welwyn Components
·
·
·
·
·
·
UL1412 recognised fusible resistor *
Failsafe mains fusing at 120 / 240Vrms
Inrush and surge withstanding
UL94-V0 flameproof coating
SMD leadform option available
RoHS compliant
* UL file number E234469.
Electrical Data
ULW2
Power rating at 25°C
5 second overload rating at 25ºC
Inrush / surge performance
Resistance range
TCR
Isolation voltage
Resistance tolerance
UL recognised standard values
Thermal impedance
Ambient temperature range
ohms
ppm/°C
volts
%
ohms
°C/watt
°C
22, 33, 47, 68, 100
110
250
22 to 100
watts
watts
2
10
ULW3
3
15
See Pulse Performance graphs
10 to 100
±200
350
5
10, 22, 27, 33, 47, 68, 100
82
-55 to +155
10
62
500
10
ULW4
4
20
Note - no limiting element voltage applies; maximum continuous voltage is
√(P.R)
Physical Data
Dimensions (mm) and weight (g)
Type
ULW2
ULW3
ULW4
L Max
9.0
14.5
13
D Max
3.6
5.2
5.6
f min
19.8
24.6
22.8
0.8
d nom
PCB
mount
centres
12.7
20.3
18.9
1.2
Min
bend
radius
Min
bend
radius
0.5
1.1
1.0
d
D
L
f
Construction
A high purity ceramic rod is assembled with interference fit end caps to which are welded the terminations. The surge withstanding resistive element
is wound on the rod and welded to the caps. Flameproof fusible cement coating is applied prior to marking with indelible ink. The components are
then leadformed if required and packed.
Marking
ULW2 & ULW3 resistors are marked with five colour bands. The first four indicate value and tolerance in conformance with IEC62. The fifth yellow
band denotes defined fusibility. ULW4 resistors are legend marked with type, value and tolerance.
General Note
Welwyn Components reserves the right to make changes in product specification without notice or liability.
All information is subject to Welwyn’s own data and is considered accurate at time of going to print.
A subsidiary of
TT electronics plc
© Welwyn Components Limited
· Bedlington, Northumberland NE22 7AA, UK
Telephone: +44 (0)1670 822181 · Facsimile: +44 (0)1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
03. 09