NTC热敏电阻系列
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     PT100热电阻传感器系列
 
WMZ12A型PTC热敏电阻

过流保护型
PTC热敏电阻

选型指南      返回上一页面    
1.应用范围:

   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。

4.产品标志说明:

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
ML 18 5 7.5  
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耐工频电压Vmax=265Vac

型号 MAX Non Operating Current at 25℃ 最大不动作电流In (mA) Trip Current at 25℃动作电流It (mA) 额定零功率电阻值R 25 (Ω) 最大工作电流I max (A) 外形尺寸(mm)
Dmax Tmax d±0.05 F±1
WMZ12A-70LB15RM080 80mA at 40℃±2℃ 160mA at 25℃±2℃ 15±20% 1.0 8 5 0.6 5
WMZ12A-70LB12RM090 90mA at 40℃±2℃ 180mA at 25℃±2℃ 12±20%
WMZ12A-70LB10RM100 100mA at 40℃±2℃ 200mA at 25℃±2℃ 10±20%
WMZ12A-75S222RM002 2mA at 60℃±2℃ 10mA at 25℃±2℃ 2200±20% 0.2

4

4.5 0.5 5
WMZ12A-75S152RM003 3mA at 60℃±2℃ 12mA at 25℃±2℃ 1500±20%
WMZ12A-75S102RM004 4mA at 60℃±2℃ 16mA at 25℃±2℃ 1000±20%
WMZ12A-75S681RM005 5mA at 60℃±2℃ 20mA at 25℃±2℃ 680±20%
WMZ12A-75S471RM006 6mA at 60℃±2℃ 24mA at 25℃±2℃ 470±20% 0.3
WMZ12A-75S331RM007 7mA at 60℃±2℃ 30mA at 25℃±2℃ 330±20%
WMZ12A-75S221RM009 9mA at 60℃±2℃ 36mA at 25℃±2℃ 220±20%
WMZ12A-75S151RM010 10mA at 60℃±2℃ 40mA at 25℃±2℃ 150±20% 0.4
WMZ12A-75S101RM012 12mA at 60℃±2℃ 50mA at 25℃±2℃ 100±20%
WMZ12A-75A471RM007 7mA at 60℃±2℃ 28mA at 25℃±2℃ 470±20% 0.4 6.5 4.5 0.6 5
WMZ12A-75A331RM008 8mA at 60℃±2℃ 34mA at 25℃±2℃ 330±20%
WMZ12A-75A221RM010 10mA at 60℃±2℃ 40mA at 25℃±2℃ 220±20% 0.5
WMZ12A-75A151RM012 12mA at 60℃±2℃ 48mA at 25℃±2℃ 150±20%
WMZ12A-75A121RM013 13mA at 60℃±2℃ 52mA at 25℃±2℃

121 ±20%

WMZ12A-75A101RM014 14mA at 60℃±2℃ 56mA at 25℃±2℃ 100±20% 0.6
WMZ12A-75A68RM016 16mA at 60℃±2℃ 64mA at 25℃±2℃ 68±20%
WMZ12A-75A47RM020 20mA at 60℃±2℃ 80mA at 25℃±2℃ 47±20%
WMZ12A-75B331RM010 10mA at 60℃±2℃ 40mA at 25℃±2℃ 330±20% 0.8 8 4.5 0.6 5
WMZ12A-75B221RM012 12mA at 60℃±2℃ 50mA at 25℃±2℃ 220±20%
WMZ12A-75B151RM015 15mA at 60℃±2℃ 60mA at 25℃±2℃ 150±20%
WMZ12A-75B101RM018 18mA at 60℃±2℃ 70mA at 25℃±2℃ 100±20% 1.0
WMZ12A-75B82RM020 20mA at 60℃±2℃ 80mA at 25℃±2℃ 82±20%
WMZ12A-75LB82RM035 35mA at 60℃±2℃ 90mA at 25℃±2℃ 82±20% 1.0 9 4.5 0.6 5
WMZ12A-75LB68RM040 40mA at 60℃±2℃ 100mA at 25℃±2℃ 68±20% 1.2
WMZ12A-75LB47RM045 45mA at 60℃±2℃ 110mA at 25℃±2℃ 47±20%
WMZ12A-75LB33RM050 50mA at 60℃±2℃ 125mA at 25℃±2℃ 33±20%
WMZ12A-75LB22RM060 60mA at 60℃±2℃ 150mA at 25℃±2℃ 22±20% 1.5
WMZ12A-75LB15RM070 70mA at 60℃±2℃ 175mA at 25℃±2℃ 15±20%
WMZ12A-75LB10RM080 80mA at 60℃±2℃ 200mA at 25℃±2℃ 10±20%
WMZ12A-80S681RM005*

5mA at 60℃±2℃

20mA at 25℃±2℃

680±20%

0.2

4.5 5.0 0.6 5
WMZ12A-80S471RM006*

6mA at 60℃±2℃

24mA at 25℃±2℃

470±20%

WMZ12A-80LB50RM060*

45mA at 60℃±2℃

120mA at 25℃±2℃

50±20%

1.2 9 5 0.6 5
WMZ12A-85A102RM0045*

4.5mA at 60℃±2℃

19mA at 25℃±2℃

1000±20%

0.4

6.5 5.0 0.6 5
WMZ12A-85A681RM007*

7mA at 60℃±2℃

30mA at 25℃±2℃

680±20%
WMZ12A-85A50RM030*

30mA at 60℃±2℃

60mA at 25℃±2℃

50±20%

0.8

WMZ12A-85A70RM025*

25mA at 60℃±2℃

90mA at 25℃±2℃

70±20%

WMZ12A-85B151RM025 25mA at 60℃±2℃ 100mA at 25℃±2℃

150±20%

0.8 8 4.5 0.6 5
WMZ12A-85B121RM030 30mA at 60℃±2℃ 120mA at 25℃±2℃

120±20%

WMZ12A-85B101RM035 35mA at 60℃±2℃ 140mA at 25℃±2℃

100±20%

0.9
WMZ12A-85B82RM040 40mA at 60℃±2℃ 160mA at 25℃±2℃

82±20%

WMZ12A-85B68RM045*

45mA at 60℃±2℃

180mA at 25℃±2℃

68±20%

1.2
WMZ12A-85B47RM050

50mA at 60℃±2℃

200mA at 25℃±2℃

47±20%
WMZ12A-85B25RM065*

65mA at 60℃±2℃

260mA at 25℃±2℃

25±20%
WMZ12A-85LB68RM060 37mA at 60℃±2℃ 110mA at 25℃±2℃ 68±20% 1.2 9 4.5 0.6 5
WMZ12A-85LB47RM065

40mA at 60℃±2℃

120mA at 25℃±2℃ 47±20%
WMZ12A-85LB39RM070

50mA at 60℃±2℃

150mA at 25℃±2℃ 39±20%
WMZ12A-85LB33RM075 75 150 33±20%
WMZ12A-85LB25RM080 80

160

25±20% 1.5
WMZ12A-85LB22RM085 85 170 22±20%
WMZ12A-85LB18RM090 90 180 18±20%
WMZ12A-85LB15RM098 98 196 15±20%
WMZ12A-85LB12RM105 105 210 12±20%
WMZ12A-85LB10RM115 115 230 10±20%
WMZ12A-95LB22RM100 100 200 22±20%
WMZ12A-100B131RM045*

45mA at 60℃±2℃

130mA at 25℃±2℃

130±20% 1.2 8.5 5.0 0.6 5
WMZ12A-100B70RM050*

50mA at 60℃±2℃

145mA at 25℃±2℃

70±20%
WMZ12A-100B60RM055*

55mA at 60℃±2℃

160mA at 25℃±2℃

60±20%

2.0

WMZ12A-100B50RM060*

60mA at 60℃±2℃

180mA at 25℃±2℃

50±20%

WMZ12A-100B22RM090*

90mA at 60℃±2℃

260mA at 25℃±2℃

22±20%

WMZ12A-105S102RM010 10mA at 60℃±2℃ 25mA at 25℃±2℃ 1000±20% 0.25 4.5 4.5 0.5 5
WMZ12A-105S221RM020 20mA at 60℃±2℃ 50mA at 25℃±2℃ 220±20%
WMZ12A-105S151RM025 25mA at 60℃±2℃ 65mA at 25℃±2℃ 150±20%
WMZ12A-105S101RM030 30mA at 60℃±2℃ 75mA at 25℃±2℃ 100±20%
WMZ12A-105L221RM025 25mA at 60℃±2℃ 65mA at 25℃±2℃ 220±20% 0.3 5.5 4.5 0.5 5
WMZ12A-105L151RM030 30mA at 60℃±2℃ 75mA at 25℃±2℃ 150±20%
WMZ12A-105L121RM35 35mA at 60℃±2℃ 88mA at 25℃±2℃ 120±20%
WMZ12A-105L101RM40 40mA at 60℃±2℃ 100mA at 25℃±2℃ 100±20%
WMZ12A-105L75RM45 45mA at 60℃±2℃ 100mA at 25℃±2℃ 75±20%
WMZ12A-105L68RM50 50mA at 60℃±2℃ 125mA at 25℃±2℃ 68±20%
WMZ12A-105L47RM55 55mA at 60℃±2℃ 138mA at 25℃±2℃ 47±20%
WMZ12A-105A151RM035 35mA at 60℃±2℃ 88mA at 25℃±2℃ 150±20% 0.4 5.5 4.5 0.5 5
WMZ12A-105A101RM45 45mA at 60℃±2℃ 115mA at 25℃±2℃ 100±20%
WMZ12A-105A68RM50 55mA at 60℃±2℃ 138mA at 25℃±2℃ 68±20%
WMZ12A-105B151M045 45mA at 60℃±2℃ 113mA at 25℃±2℃ 150±20% 0.8 8 4.5 0.6 5
WMZ12A-105B121M050 50mA at 60℃±2℃ 125mA at 25℃±2℃ 120±20%
WMZ12A-105B101M055 55mA at 60℃±2℃ 138mA at 25℃±2℃ 100±20%
WMZ12A-105B82RM060 60mA at 60℃±2℃ 150mA at 25℃±2℃ 82±20% 0.9
WMZ12A-105B62RM075 75mA at 60℃±2℃ 188mA at 25℃±2℃ 62±20%
WMZ12A-105LB39RM085 85mA at 60℃±2℃ 213mA at 25℃±2℃ 39±20% 1.2 9 4.5 0.6 5
WMZ12A-105LB22RM100 100mA at 60℃±2℃ 250mA at 25℃±2℃ 22±20%
WMZ12A-105LB15RM110 110mA at 60℃±2℃ 275mA at 25℃±2℃ 15±20%
WMZ12A-105LB10RM120 120mA at 60℃±2℃ 300mA at 25℃±2℃ 22±20%
WMZ12A-105M22RM120 120mA at 60℃±2℃ 300mA at 25℃±2℃ 22±20% 1.6 12 4.5 0.6 5
WMZ12A-105M15RM130 130mA at 60℃±2℃ 325mA at 25℃±2℃ 15±20%
WMZ12A-105M10RM140 140mA at 60℃±2℃ 350mA at 25℃±2℃ 10±20%
WMZ12A-105M8R2M150 150mA at 60℃±2℃ 375mA at 25℃±2℃ 8.2±20%
WMZ12A-105SL18RM150 150mA at 60℃±2℃ 375mA at 25℃±2℃ 18±20% 2.5 15 5 0.8 7.5
WMZ12A-105SL15RM160 160mA at 60℃±2℃ 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℃ 480mA at 25℃±2℃ 8.2±20%
WMZ12A-105SL6R8M200 200mA at 60℃±2℃ 500mA at 25℃±2℃ 6.8±20%
WMZ12A-120L101RM040 40mA at 60℃±2℃ 80mA at 25℃±2℃ 100±20% 0.3 5.5 4.5 0.6 5
WMZ12A-120L75RM045 45mA at 60℃±2℃ 90mA at 25℃±2℃ 75±20%
WMZ12A-120L62RM050 50mA at 60℃±2℃ 100mA at 25℃±2℃ 62±20%
WMZ12A-120A102RM015 15mA at 60℃±2℃ 40mA at 25℃±2℃ 1000±20% 0.4 6.5 5 0.6 5
WMZ12A-120A301RM020 20mA at 60℃±2℃ 50mA at 25℃±2℃ 300±20%
WMZ12A-120A151RM040 40mA at 60℃±2℃ 80mA at 60℃±2℃ 151±20%
WMZ12A-120A101RM050 50mA at 60℃±2℃ 100mA at 60℃±2℃ 100±20%
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-120B56RM080 80mA at 60℃±2℃ 205mA at 25℃±2℃ 56±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-120LB68RM075 75mA at 60℃±2℃ 180mA at 25℃±2℃ 68±20% 1.2 9 5 0.6 5
WMZ12A-120LB82RM060 60mA at 60℃±2℃ 145mA at 25℃±2℃ 82±20% 1.2 9 5 0.6 5
WMZ12A-120LB101RM055 55mA at 60℃±2℃ 130mA at 25℃±2℃ 100±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±20% 30 60 0.8 265 6.5 5.0 5.0 0.6
2 WMZ12A-85B68RMU 68±20% 45 90 1.2 420 8.5 7.0 5.0 0.6

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