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1.应用范围: 华巨电子过流保护型PTC热敏电阻主要用于[变压器(适配器)/初级线圈/充电器/数字万用表/智能电度表/微电机/晶体管]等的过流过热保护,直接串联在负载电路中,在线路出现异常状况时,能够自动限制过电流或阻断电流,当故障排除后又恢复原态,俗称“万次保险丝”。
2.特点:
·无触点的电路及元器件保护 ·自动限制过电流
·故障排除后自动恢复 ·工作时无噪音无火花
·工作可靠、使用方便
3.应用原理:
将过流保护型型PTC热敏电阻串联在电源回路中,当电路处于正常状态时,流过PTC的电流小于额定电流,PTC处于常态,阻值很小,不会影响电子镇流器(节能灯、变压器、万用表)等被保护电路的正常工作。当电路电流大大超过额定电流时,PTC陡然发热,阻值骤增至高阻态,从而限制或阻断电流,保护电路不受损坏。电流电流回复正常后,PTC亦自动回复至低阻态,电路恢复正常工作。
过流保护型型PTC热敏电阻在电子镇流器(节能灯、变压器、万用表)等过流保护应用领域,南京华巨凭借其科研和工艺等方面的优势,率先推出了以高耐压(V≥300V
AC )为特色的WMZ12型产品。
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4.产品标志说明:
①产品系列:过流/过热保护系列PTC热敏电阻
②开关温度类别:75-75℃ 105-105℃ 120-120℃
③芯片直径:S-Φ3 A-Φ5 B-Φ7 LB-Φ8 M-Φ10 SL-Φ13 LL-Φ19
④标称阻值:82R-82Ω 4R7-4.7Ω 151-150Ω
⑤阻值精度:N-±30% M-±20% k-±10% J-±5%
⑥最大不动作电流:060-60mA 300-300mA
使用PTC作为过流保护元件,一般应选取最大不动作电流、最大工作电压合适的规格,同时也应考虑元件的外形尺寸、额定零功率电阻、使用温度范围等因素。通常取电路正常工作时的最大工作电流的1.2~1.5倍为PTC最大不动作电流;线路在正常或不正常状态下可能施加到PTC上的电压应不大于其最大工作电压。
类型代号 |
Dmax |
Tmax |
F±1 |
d±0.05 |
S |
4.5 |
4.5 |
5 |
0.5 |
L |
5.5 |
4.5 |
5 |
0.6 |
A |
6.5 |
4.5 |
5 |
0.6 |
B |
8 |
4.5 |
5 |
0.6 |
LB |
9 |
4.5 |
5 |
0.6 |
M |
12 |
5 |
5 |
0.6 |
SL |
15 |
5 |
7.5 |
0.8 |
LL |
24 |
5 |
7.5 |
0.8 |
5.主要技术参数:
主要用于充电器、适配器(初级线圈)、电能表、数字万用表等过流保护
型号
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MAX Non Operating Current at 25℃
最大不动作电流In (mA)
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Trip Current at 25℃动作电流It (mA)
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额定零功率电阻值R 25 (Ω)
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最大工作电流I max (A)
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外形尺寸(mm)
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Dmax
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Tmax
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d±0.05
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F±1
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WMZ12A-70LB15RM080
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80mA at 40℃±2℃
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160
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15±30%
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1.0
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8
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5
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0.6
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5
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WMZ12A-70LB12RM090
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90mA at 40℃±2℃
|
180
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12±30%
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WMZ12A-70LB10RM100
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100mA at 40℃±2℃
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200
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10±30%
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WMZ12A-75S222RM005
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5
|
10
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2200±30%
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0.2
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4
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4.5
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0.5
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5
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WMZ12A-75S152RM006
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6
|
12
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1500±30%
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WMZ12A-75S102RM008
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8
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16
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1000±30%
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WMZ12A-75S681RM010
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10
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20
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680±30%
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WMZ12A-75S471RM012
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12
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24
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470±30%
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0.3
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WMZ12A-75S331RM015
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15
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30
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330±30%
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WMZ12A-75S221RM018
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18
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36
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220±30%
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WMZ12A-75S151RM020
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20
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40
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150±30%
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0.4
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WMZ12A-75S101RM025
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25
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50
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100±30%
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WMZ12A-75A471RM014
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14
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28
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470±30%
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0.4
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6.5
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4.5
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0.6
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5
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WMZ12A-75A331RM017
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17
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34
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330±30%
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WMZ12A-75A221RM020
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20
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40
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220±30%
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0.5
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WMZ12A-75A151RM024
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24
|
48
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150±30%
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WMZ12A-75A121RM026
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26
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52
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121 ±30%
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WMZ12A-75A101RM028
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28
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56
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100±30%
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0.6
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WMZ12A-75A68RM032
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32
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64
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68±30%
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WMZ12A-75A47RM040
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40
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80
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47±30%
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WMZ12A-75B331RM020
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20
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40
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330±30%
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0.8
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8
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4.5
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0.6
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5
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WMZ12A-75B221RM025
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25
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50
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220±30%
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WMZ12A-75B151RM030
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30
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60
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150±30%
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WMZ12A-75B101RM035
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35
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70
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100±30%
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1.0
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WMZ12A-75B82RM040
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40
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80
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82±30%
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WMZ12A-75LB82RM035
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35mA at 60℃±2℃
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90mA at 25℃±2℃
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82±30%
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1.0
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9
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4.5
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0.6
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5
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WMZ12A-75LB68RM040
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40mA at 60℃±2℃
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100mA at 25℃±2℃
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68±30%
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1.2
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WMZ12A-75LB47RM045
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45mA at 60℃±2℃
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110mA at 25℃±2℃
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47±30%
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WMZ12A-75LB33RM050
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50mA at 60℃±2℃
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125mA at 25℃±2℃
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33±30%
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WMZ12A-75LB22RM060
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60mA at 60℃±2℃
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150mA at 25℃±2℃
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22±30%
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1.5
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WMZ12A-75LB15RM070
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70mA at 60℃±2℃
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175mA at 25℃±2℃
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15±30%
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WMZ12A-75LB10RM080
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80mA at 60℃±2℃
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200mA at 25℃±2℃
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10±30%
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WMZ12A-80S681RM005*
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5mA at 60℃±2℃
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20mA at 25℃±2℃
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680±30%
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0.2
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4.5
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5.0
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0.6
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5
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WMZ12A-80S471RM006*
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6mA at 60℃±2℃
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24mA at 25℃±2℃
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470±30%
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WMZ12A-80LB50RM060*
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45mA at 60℃±2℃
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120mA at 25℃±2℃
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50±30%
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1.2
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9
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5
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0.6
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5
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WMZ12A-85A102RM0045*
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4.5mA at 60℃±2℃
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19mA at 25℃±2℃
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1000±30%
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0.4
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6.5
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5.0
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0.6
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5
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WMZ12A-85A681RM007*
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7mA at 60℃±2℃
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30mA at 25℃±2℃
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680±30%
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WMZ12A-85A50RM030*
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30mA at 60℃±2℃
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60mA at 25℃±2℃
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50±30%
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0.8
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WMZ12A-85A70RM025*
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25mA at 60℃±2℃
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90mA at 25℃±2℃
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70±30%
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WMZ12A-85B151RM35
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35
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70
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150±30%
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0.8
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8
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4.5
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0.6
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5
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WMZ12A-85B121RM040
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40
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80
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120±30%
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WMZ12A-85B101RM045
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45
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90
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100±30%
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0.9
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WMZ12A-85B82RM050
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50
|
100
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82±30%
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WMZ12A-85B68RM045*
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45mA at 60℃±2℃
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90mA at 25℃±2℃
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68±30%
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1.2
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WMZ12A-85B47RM055
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55mA at 60℃±2℃
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110mA at 25℃±2℃
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47±30%
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WMZ12A-85B25RM065*
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65mA at 60℃±2℃
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130mA at 25℃±2℃
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25±30%
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WMZ12A-85LB68RM060
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60
|
120
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68±30%
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1.2
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9
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4.5
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0.6
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5
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WMZ12A-85LB47RM065
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65
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130
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47±30%
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WMZ12A-85LB39RM070
|
70
|
140
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39±30%
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WMZ12A-85LB33RM075
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75
|
150
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33±30%
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WMZ12A-85LB25RM080
|
80
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160
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25±30%
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1.5
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WMZ12A-85LB22RM085
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85
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170
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22±30%
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WMZ12A-85LB18RM090
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90
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180
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18±30%
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WMZ12A-85LB15RM098
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98
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196
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15±30%
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WMZ12A-85LB12RM105
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105
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210
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12±30%
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WMZ12A-85LB10RM115
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115
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230
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10±30%
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WMZ12A-95LB22RM100
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100
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200
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22±30%
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WMZ12A-100B131RM045*
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45mA at 60℃±2℃
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130mA at 25℃±2℃
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130±30%
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1.2
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8.5
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5.0
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0.6
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5
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WMZ12A-100B70RM050*
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50mA at 60℃±2℃
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145mA at 25℃±2℃
|
70±30%
|
WMZ12A-100B60RM055*
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55mA at 60℃±2℃
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160mA at 25℃±2℃
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60±30%
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2.0
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WMZ12A-100B50RM060*
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60mA at 60℃±2℃
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180mA at 25℃±2℃
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50±30%
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WMZ12A-100B22RM090*
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90mA at 60℃±2℃
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260mA at 25℃±2℃
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22±30%
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WMZ12A-105S102RM015
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15mA at 60℃±2℃
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35mA at 25℃±2℃
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1000±30%
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0.25
|
4.5
|
4.5
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0.5
|
5
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WMZ12A-105S221RM020
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20mA at 60℃±2℃
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50mA at 25℃±2℃
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220±30%
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WMZ12A-105S151RM025
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25mA at 60℃±2℃
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65mA at 25℃±2℃
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150±30%
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WMZ12A-105S101RM030
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30mA at 60℃±2℃
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75mA at 25℃±2℃
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100±30%
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WMZ12A-105L221RM025
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25mA at 60℃±2℃
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65mA at 25℃±2℃
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220±30%
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0.3
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5.5
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4.5
|
0.5
|
5
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WMZ12A-105L151RM030
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30mA at 60℃±2℃
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75mA at 25℃±2℃
|
150±30%
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WMZ12A-105L121RM35
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35mA at 60℃±2℃
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88mA at 25℃±2℃
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120±30%
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WMZ12A-105L101RM40
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40mA at 60℃±2℃
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100mA at 25℃±2℃
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100±30%
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WMZ12A-105L75RM45
|
45mA at 60℃±2℃
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100mA at 25℃±2℃
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75±30%
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WMZ12A-105L68RM50
|
50mA at 60℃±2℃
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125mA at 25℃±2℃
|
68±30%
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WMZ12A-105L47RM55
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55mA at 60℃±2℃
|
138mA at 25℃±2℃
|
47±30%
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WMZ12A-105A151RM035
|
35mA at 60℃±2℃
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88mA at 25℃±2℃
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150±30%
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0.4
|
5.5
|
4.5
|
0.5
|
5
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WMZ12A-105A101RM45
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45mA at 60℃±2℃
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115mA at 25℃±2℃
|
100±30%
|
WMZ12A-105A68RM50
|
55mA at 60℃±2℃
|
138mA at 25℃±2℃
|
68±30%
|
WMZ12A-105B151M045
|
45mA at 60℃±2℃
|
113mA at 25℃±2℃
|
150±30%
|
0.8
|
8
|
4.5
|
0.6
|
5
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WMZ12A-105B121M050
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50mA at 60℃±2℃
|
125mA at 25℃±2℃
|
120±30%
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WMZ12A-105B101M055
|
55mA at 60℃±2℃
|
138mA at 25℃±2℃
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100±30%
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WMZ12A-105B82RM060
|
60mA at 60℃±2℃
|
150mA at 25℃±2℃
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82±30%
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0.9
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WMZ12A-105B62RM075
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75mA at 60℃±2℃
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188mA at 25℃±2℃
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62±30%
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WMZ12A-105LB39RM085
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85mA at 60℃±2℃
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213mA at 25℃±2℃
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39±30%
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1.2
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9
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4.5
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0.6
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5
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WMZ12A-105LB22RM100
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100mA at 60℃±2℃
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250mA at 25℃±2℃
|
22±30%
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WMZ12A-105LB15RM110
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110mA at 60℃±2℃
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275mA at 25℃±2℃
|
15±30%
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WMZ12A-105LB10RM120
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120mA at 60℃±2℃
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300mA at 25℃±2℃
|
22±30%
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WMZ12A-105M22RM120
|
120mA at 60℃±2℃
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300mA at 25℃±2℃
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22±20%
|
1.6
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12
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4.5
|
0.6
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5
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WMZ12A-105M15RM130
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130mA at 60℃±2℃
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325mA at 25℃±2℃
|
15±20%
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WMZ12A-105M10RM140
|
140mA at 60℃±2℃
|
350mA at 25℃±2℃
|
10±20%
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WMZ12A-105M8R2M150
|
150mA at 60℃±2℃
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375mA at 25℃±2℃
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8.2±20%
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WMZ12A-105SL18RM150
|
150mA at 60℃±2℃
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375mA at 25℃±2℃
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18±20%
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2.5
|
15
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5
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0.8
|
7.5
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WMZ12A-105SL15RM160
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160mA at 60℃±2℃
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400mA at 25℃±2℃
|
15±20%
|
WMZ12A-105SL12RM170
|
170mA at 60℃±2℃
|
425mA at 25℃±2℃
|
12±20%
|
WMZ12A-105SL10RM180
|
180mA at 60℃±2℃
|
450mA at 25℃±2℃
|
10±20%
|
WMZ12A-105SL8R2M190
|
190mA at 60℃±2℃
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480mA at 25℃±2℃
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8.2±20%
|
WMZ12A-105SL6R8M200
|
200mA at 60℃±2℃
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500mA at 25℃±2℃
|
6.8±20%
|
WMZ12A-120L101RM040
|
40mA at 60℃±2℃
|
80mA at 25℃±2℃
|
100±30%
|
0.3
|
5.5
|
4.5
|
0.6
|
5
|
WMZ12A-120L75RM045
|
45mA at 60℃±2℃
|
90mA at 25℃±2℃
|
75±30%
|
WMZ12A-120L62RM050
|
50mA at 60℃±2℃
|
100mA at 25℃±2℃
|
62±30%
|
WMZ12A-120A102RM015
|
15mA at 60℃±2℃
|
40mA at 25℃±2℃
|
1000±30%
|
0.4
|
6.5
|
5
|
0.6
|
5
|
WMZ12A-120A301RM020
|
20mA at 60℃±2℃
|
50mA at 25℃±2℃
|
300±30%
|
WMZ12A-120A151RM040
|
40mA at 60℃±2℃
|
80mA at 60℃±2℃
|
151±30%
|
WMZ12A-120A101RM050
|
50mA at 60℃±2℃
|
100mA at 60℃±2℃
|
100±30%
|
WMZ12A-120A68RM060
|
60mA at 60℃±2℃
|
120mA at 25℃±2℃
|
68±20%
|
WMZ12A-120A47RM065
|
65mA at 60℃±2℃
|
130mA at 25℃±2℃
|
47±20%
|
WMZ12A-120B251RM030
|
30mA at 60℃±2℃
|
75mA at 25℃±2℃
|
250±20%
|
0.9
|
8
|
5
|
0.6
|
5
|
WMZ12A-120B121RM045
|
45mA at 60℃±2℃
|
110mA at 25℃±2℃
|
121±20%
|
WMZ12A-120B101RM050
|
50mA at 60℃±2℃
|
125mA at 25℃±2℃
|
100±20%
|
WMZ12A-120B68RM070
|
70mA at 60℃±2℃
|
180mA at 25℃±2℃
|
68±20%
|
WMZ12A-120LB25RM110
|
110mA at 60℃±2℃
|
270mA at 25℃±2℃
|
25±20%
|
1.2
|
9
|
5
|
0.6
|
5
|
WMZ12A-120LB39RM100
|
100mA at 60℃±2℃
|
240mA at 25℃±2℃
|
39±20%
|
1.2
|
9
|
5
|
0.6
|
5
|
WMZ12A-120M181RM040
|
40mA at 60℃±2℃
|
80mA at 25℃±2℃
|
180±20%
|
1.6
|
12
|
5
|
0.6
|
5
|
WMZ12A-120M101RM060
|
60mA at 60℃±2℃
|
120mA at 25℃±2℃
|
100±20%
|
WMZ12A-120M82RM065
|
65mA at 60℃±2℃
|
130mA at 25℃±2℃
|
82±20%
|
WMZ12A-120M60RM070
|
70mA at 60℃±2℃
|
140mA at 25℃±2℃
|
60±20%
|
WMZ12A-120M55RM080
|
80mA at 60℃±2℃
|
160mA at 25℃±2℃
|
55±20%
|
WMZ12A-120M47RM090
|
90mA at 60℃±2℃
|
180mA at 25℃±2℃
|
47±20%
|
WMZ12A-120M39RM100
|
100mA at 60℃±2℃
|
200mA at 25℃±2℃
|
39±20%
|
WMZ12A-120M33RM110
|
110mA at 60℃±2℃
|
220mA at 25℃±2℃
|
33±20%
|
WMZ12A-120M22RM130
|
130mA at 60℃±2℃
|
260mA at 25℃±2℃
|
22±20%
|
WMZ12A-120M15RM150
|
145mA at 60℃±2℃
|
290mA at 25℃±2℃
|
15±20%
|
WMZ12A-120M10RM170
|
160mA at 60℃±2℃
|
320mA at 25℃±2℃
|
10±20%
|
WMZ12A-120M8R2M170
|
170mA at 60℃±2℃
|
340mA at 25℃±2℃
|
8.2±20%
|
WMZ12A-120SL45RM120
|
120mA at 60℃±2℃
|
300mA at 25℃±2℃
|
45±20%
|
2.5
|
15
|
5
|
0.6
|
5
|
WMZ12A-120SL22RM180
|
180mA at 60℃±2℃
|
360mA at 25℃±2℃
|
22±20%
|
WMZ12A-120SL15RM200
|
200mA at 60℃±2℃
|
400mA at 25℃±2℃
|
15±20%
|
WMZ12A-120SL12RM210
|
210mA at 60℃±2℃
|
420mA at 25℃±2℃
|
12±20%
|
WMZ12A-120SL10RM220
|
220mA at 60℃±2℃
|
440mA at 25℃±2℃
|
10±20%
|
WMZ12A-120SL8R2M240
|
240mA at 60℃±2℃
|
480mA at 25℃±2℃
|
8.2±20%
|
WMZ12A-120SL6R8M260
|
260mA at 60℃±2℃
|
520mA at 25℃±2℃
|
6.8±20%
|
WMZ12A-120GL6R0M300
|
300mA at 60℃±2℃
|
780mA at 25℃±2℃
|
6.0±20%
|
3.1
|
17.5
|
5
|
0.6
|
5
|
WMZ12A-120GL7R0M280
|
280mA at 60℃±2℃
|
700mA at 25℃±2℃
|
7.0±20%
|
WMZ12A-120LL12RM300
|
300
|
600
|
12±20%
|
3.5
|
24
|
5
|
0.8
|
7.5
|
WMZ12A-120LL10RM330
|
330
|
660
|
10±20%
|
WMZ12A-120LL8R2M360
|
360
|
720
|
8.2±20%
|
4.0
|
WMZ12A-120LL6R8M400
|
400
|
800
|
6.8±20%
|
WMZ12A-120LL4R7M450
|
450
|
900
|
4.7±20%
|
4.5
|
WMZ12A-120LL3R3M500
|
500
|
1000
|
3.3±20%
|
WMZ12A-120LL2R2M550
|
550
|
1100
|
2.2±20%
|
5.0
|
WMZ12A-120LL1R5M600
|
600
|
1200
|
1.5±20%
|
·用于485,232等接口电路保护
自动抄表技术在电表应用中越来越流行,该技术为电表提供通信端口远程读取数据,RS-485是一种简单、廉价而且可靠的通信规范,而PTC热敏电阻能为RS-485电表线路可提供过压,过流保护,譬如RS-485总线与电力线(例如,220/380V)短路时.
WMZ12A-85A50RMU,WMZ12A-85BHV68RMU是设计专门对RS-485电表线路进行过流,过载保护的一种PTC.当线路处于正常状态时,
PTC处于常态,阻值很小,不会影响被保护电路的正常工作.当电路出现故障,电流增大,
PTC呈现高阻态,使电路处于相对”断开”状态,从而保护RS-485接口不受损坏,当故障排除后,
PTC亦自动回复到低阻态.
序号
|
型号
|
额定零功率电阻
|
最大不动作电流
at 25℃
|
动作电流
at 25℃
|
最大电流
Imax
|
最大电压
Vmax
|
外形尺寸(mm)
|
R25(Ω)
|
Int(mA)
|
It(mA)
|
(A)
|
(Vac)
|
Dmax
|
Tmax
|
F±1
|
dmax
|
1
|
WMZ12A-85A50RMU
|
50±30%
|
30
|
60
|
0.8
|
265
|
6.5
|
5.0
|
5.0
|
0.6
|
2
|
WMZ12A-85B68RMU
|
68±30%
|
45
|
90
|
1.2
|
420
|
8.5
|
7.0
|
5.0
|
0.6
|
|