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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.
Electrical Data
ULW2
ULW3
ULW4
ULW5
Power rating at 25°C
5 second overload rating at 25oC
watts
watts
2
10
3
15
4
20
5
25
Inrush / surge performance
See Pulse Performance graphs
Resistance range
ohms
4R7 to 100
4R7 to 100
4R7 to 100
4R7-100
TCR
ppm/°C
±200
Isolation voltage
volts
250
350
500
Resistance tolerance
UL recognised standard values
%
ohms
5
Any value in range 4R7 to 100R is recognised. E24 preferred
Thermal impedance
°C/watt
110
82
62
54
Ambient temperature range
°C
-55 to +155
Note - no limiting element voltage applies; maximum continuous voltage is √ (P.R)
Physical Data
Dimensions (mm) and weight (g)
Type
L Max
D Max
f min
d nom
PCB
mount
centres
Min
bend
radius
Wt.
Nom
ULW2
ULW3
ULW4
9.0
14.5
13
3.8
5.8
5.6
19.8
24.6
22.8
0.8
12.7
20.3
18.9
1.2
0.5
1.1
1.0
d
D
L
f
ULW5
16.5
7.2
23.6
22.9
1.8
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 and ULW5 resistors are legend marked with type, value and tolerance.
General Note
TT electronics reserves the right to make changes in product specification without notice or liability.
All information is subject to TT electronics’ own data and is considered accurate at time of going to print.
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
? TT electronics plc
03.13
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