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ULW2-22RJA25 Datasheet(PDF) 4 Page - List of Unclassifed Manufacturers

Part # ULW2-22RJA25
Description  UL Recognised Wirewound Resistors
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ULW2-22RJA25 Datasheet(HTML) 4 Page - List of Unclassifed Manufacturers

  ULW2-22RJA25 Datasheet HTML 1Page - List of Unclassifed Manufacturers ULW2-22RJA25 Datasheet HTML 2Page - List of Unclassifed Manufacturers ULW2-22RJA25 Datasheet HTML 3Page - List of Unclassifed Manufacturers ULW2-22RJA25 Datasheet HTML 4Page - List of Unclassifed Manufacturers ULW2-22RJA25 Datasheet HTML 5Page - List of Unclassifed Manufacturers  
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UL Recognised
Wirewound Resistors
ULW Series
Fusing Performance
ULW5 Fusing Characteristic
0
10
20
30
40
50
60
80
100
120
140
160
180
200
Initial Power (W)
Notes:
1. Typical fusing times are around 1/3 of the maximum figures.
2. After fusing the resistance value is >100 times the initial nominal value, provided the initial power
is at least 20 x rated power.
3. Suitable for fusing at voltages up to 264Vrms.
Application Notes
Application Notes
1. If the resistors are to dissipate full rated power, it is recommended that the terminations should not be
soldered closer than 4mm from the body.
2. Due to operating temperature limits imposed by some PCB materials, derating may be necessary. An
estimate of the temperature rise to be expected can be calculated using the thermal impedance figures
given under Electrical Data.
3. For the purposes of UL approval, the following points should be observed:
3.1 To protect against fire under all conditions of overload, a positive clearance of at least
13mm should be provided between the body of the resistor and any combustible materials.
3.2 A positive clearance of 13mm should be provided between the resistor body or terminations
and uninsulated parts of opposite polarity or uninsulated dead metal parts.
3.3 Limited Short Circuit testing should be performed in the complete appliance.
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
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.
© TT electronics plc
03.13
Initial Power (W)
ULW3 & ULW4 Fusing Characteristic
180
160
140
120
100
80
60
40
40
50
60
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80
90
100
110
120
20
0


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Revision: 30-Mar-12
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