ULW4-10RJA1 Datasheet, PDF (1/4 Pages) List of Unclassifed Manufacturers – UL Recognised Wirewound Resistors

UL Recognised
Wirewound Resistors
ULW Series
· 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.
Welwyn Components
Electrical Data
ULW2
Power rating at 25°C
watts
2
5 second overload rating at 25ºC
watts
10
Inrush / surge performance
Resistance range
ohms
22 to 100
TCR
ppm/°C
Isolation voltage
volts
250
Resistance tolerance
%
UL recognised standard values
ohms
22, 33, 47, 68, 100
Thermal impedance
Ambient temperature range
°C/watt
110
°C
Note - no limiting element voltage applies; maximum continuous voltage is √(P.R)
ULW3
3
15
See Pulse Performance graphs
10 to 100
±200
350
5
10, 22, 27, 33, 47, 68, 100
82
-55 to +155
Physical Data
Dimensions (mm) and weight (g)
PCB
Min
Type L Max D Max f min d nom mount bend
centres radius
ULW2 9.0
3.6 19.8
12.7
Min
bend
radius
0.5
ULW3 14.5 5.2 24.6
0.8
20.3
1.2
1.1
ULW4 13
5.6 22.8
18.9
1.0
d
D
L
ULW4
4
20
10
500
10
62
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.
© Welwyn Components Limited · Bedlington, Northumberland NE22 7AA, UK
Telephone: [phone] · Facsimile: [phone] · Email: [e-mail] · Website: www.welwyn-tt.com
A subsidiary of
TT electronics plc
03. 09