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UL Recognised
Wirewound Resistors
ULW Series
Fusing Performance
ULW3 & ULW4 Fusing Characteristic
180
160
140
120
100
80
60
40
20
0
40
50
60
70
80
90
100
110
120
Initial Power (W)
ULW5 Fusing Characteristic
60
50
40
30
20
10
0
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.
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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相关代理商/技术参数 |
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|---|---|
| VDRS14T420BSE | 功能描述:VARISTOR 420V RMS 17MM LEADED RoHS:否 类别:过电压，电流，温度装置 >> TVS - 变阻器，MOV 系列:- 标准包装:1 系列:- 变阻器电压:33V 电流 - 浪涌:4A 电路数:1 最大交流电压:14VAC 最大直流电压:18VDC 能量:0.015J 封装/外壳:0402（1005 公制） 其它名称:478-6870-6 |
| VDRS14T420TLE | 制造商:Vishay Semiconductors 功能描述: |
| VDRS14T420TME | 制造商:Vishay Semiconductors 功能描述: |
| VDRS14T420TSE | 制造商:Vishay Angstrohm 功能描述:Var MOV 420VAC/560VDC 4500A 680V Radial T/R |
| VDRS14T460ALE | 制造商:Vishay Angstrohm 功能描述:Var MOV 460VAC/615VDC 4500A 750V Radial Ammo Pack |
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