WMZ12A型PTC热敏电阻
wmz12a型ptc热敏电阻
1.应用范围：
wmz12a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wmz12a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。
wmz12a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：
①产品系列：wmz12a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：
·wmz12a（i）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 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℃ 160 15±20% 1.0 8 5 0.6 5
wmz12a-70lb12rm090 90ma at 40℃±2℃ 180 12±20%
wmz12a-70lb10rm100 100ma at 40℃±2℃ 200 10±20%
wmz12a-75s222rm005 5 10 2200±20% 0.2 4
4.5 0.5 5
wmz12a-75s152rm006 6 12 1500±20%
wmz12a-75s102rm008 8 16 1000±20%
wmz12a-75s681rm010 10 20 680±20%
wmz12a-75s471rm012 12 24 470±20% 0.3
wmz12a-75s331rm015 15 30 330±20%
wmz12a-75s221rm018 18 36 220±20%
wmz12a-75s151rm020 20 40 150±20% 0.4
wmz12a-75s101rm025 25 50 100±20%
wmz12a-75a471rm014 14 28 470±20% 0.4 6.5 4.5 0.6 5
wmz12a-75a331rm017 17 34 330±20%
wmz12a-75a221rm020 20 40 220±20% 0.5
wmz12a-75a151rm024 24 48 150±20%
wmz12a-75a121rm026 26 52 121 ±20%
wmz12a-75a101rm028 28
56 100±20% 0.6
wmz12a-75a68rm032 32 64 68±20%
wmz12a-75a47rm040 40 80 47±20%
wmz12a-75b331rm020 20 40 330±20% 0.8 8 4.5 0.6 5
wmz12a-75b221rm025 25 50 220±20%
wmz12a-75b151rm030 30 60 150±20%
wmz12a-75b101rm035 35 70 100±20% 1.0
wmz12a-75b82rm040 40 80 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-85b151rm35 35 70 150±20%
0.8 8 4.5 0.6 5
wmz12a-85b121rm040 40 80 120±20%
wmz12a-85b101rm045 45 90 100±20%
0.9
wmz12a-85b82rm050 50 100 82±20%
wmz12a-85b70rm045* 45ma at 60℃±2℃
90ma at 25℃±2℃
70±20%
1.2
wmz12a-85b47rm055 55ma at 60℃±2℃
110ma at 25℃±2℃
47±20%
wmz12a-85b25rm065* 65ma at 60℃±2℃
130ma at 25℃±2℃
25±20%
wmz12a-85lb68rm060 60 120 68±20% 1.2 9 4.5 0.6 5
wmz12a-85lb47rm065 65 130 47±20%
wmz12a-85lb39rm070 70 140 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-105s102rm015 15ma at 60℃±2℃ 35ma 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-120lb25rm110 110ma at 60℃±2℃ 270ma at 25℃±2℃ 25±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-120sl22rm180 180ma at 60℃±2℃ 360ma at 25℃±2℃ 22±20% 2.5 15 5 0.6 5
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℃ 320ma 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%
·wmz12a（ⅱ）主要用于防雷,通信机过流保护
其它电性能参数：
耐工频电流能力：3arms 220vrms20times
耐雷击波能力：10/310μs 1.5kv37.5a 10times
10/1000μs 1.0kv25a 30times
耐电压能力：250vrms 3arms 15min
恢复时间：≤60s
耐高压感应能力：650vrms 1.1arms 20times
序号 型号 额定零功率电阻 最大不动作电流
int（ma） 最大电流下
的动作时间 最大电流
imax 最大电压
vmax 失效模式 外形尺寸(mm)
r25(ω) at 40℃ t(sec) (a) (v) dmax tmax f±1 dmax
1 wmz12a-10rm100 10±20% 100 < 0.2 3.0 250 250v/10a 7.5 4.0 5.0 0.6
2 wmz12a-12rm100 12±20% 100 < 0.3 2.0 250 250v/10a 9.0 5.0 5.0 0.6
3 wmz12a-12rm060 12±20% 60 < 0.2 2.0 250 250v/10a 9.0 5.0 5.0 0.6
4 wmz12a-20rm080 10±20% 80 < 0.2 3.0 250 250v/10a 9.0 4.0 5.0 0.6
5 wmz12a-35rm075 35±20% 75 < 0.2 3.0 250 250v/5a 9.0 5.0 5.0 0.6
6 wmz12a-40rm070 40±20% 70 < 0.2 3.0 250 250v/5a 9.0 5.0 5.0 0.6
7 wmz12a-50rm060 50±20% 60 < 0.2 3.0 250 250v/5a 9.0 5.0 5.0 0.6
8 wmz12a-50rm060 50±20% 60 < 0.2 3.0 650 650v/10a 9.5 5.0 5.0 0.6
9 wmz12a-55rm060 55±20% 60 < 0.2 3.0 650 650v/10a 9.5 5.0 5.0 0.6
10 wmz12a-9r0m130 9±20% 130 < 0.8 3.0 250 250v/10a 10.5 4.5 5.0 0.6
11 wmz12a-25rm080 25±20% 80 < 0.2 3.0 250 250v/10a 6.6 4.0 5.0 0.6
12 wmz12a-25rm100 25±20% 100 < 0.4 3.0 250 250v/10a 8.2 4.0 5.0 0.6
13 wmz12a-10rm130 10±20% 130 < 0.5 3.0 250 250v/10a 9.5 4.5 5.0 0.6
14 wmz12a-12rm090 12±20% 90 < 0.3 2.0 250 250v/10a 9.5 4.5 5.0 0.6
15 wmz12a-15rm070 15±20% 70 < 0.2 2.0 250 250v/10a 9.5 4.5 5.0 0.6
16 wmz12a-18rm110 18±20% 110 < 0.4 3.0 250 250v/10a 9.5 4.5 5.0 0.6
17 wmz12a-20rm070 20±20% 70 < 0.2 3.0 250 250v/10a 9.5 4.5 5.0 0.6
18 wmz12a-35rm060 35±20% 60 < 0.2 3.0 250 250v/10a 9.5 4.5 5.0 0.6
19 wmz12a-50rm060 50±20% 60 < 0.2 3.0 250 250v/10a 11 4.5 5.0 0.6
20 wmz12a-55rm060 55±20% 60 < 0.2 3.0 250 250v/10a 11 4.5 5.0 0.6
21 wmz12a-101rm050 100±20% 50 < 0.1 3.0 250 250v/10a 9.0 4.5 5.0 0.6
22 wmz12a-10rm140smd 10±20% 140 < 5.0 1.0 250 250v/10a / / / /
23 wmz12a-9r0m130smd 9±20% 130 < 0.5 3.0 250 250v/10a / / / /
24 wmz12a-25rm100smd 25±20% 100 < 0.3 3.0 250 250v/10a / / / /
25 wmz12a-25rm100smd 25±20% 100 < 0.4 3.0 300 300v/10a / / / /
26 wmz12a-39rm070smd 39±20% 70 < 0.3 3.0 300 300v/10a / / / /
27 wmz12a-50rm070smd 50±20% 70 < 0.2 3.0 250 250v/5a / / / /
28 wmz12a-50rm060smd 50±20% 60 < 0.2 3.0 600 600v/5a / / / /
29 wmz12a-55rm050smd 55±20% 50 < 0.2 3.0 600 600v/5a / / / /
30 wmz12a-20rm080smd 20±20% 80 < 0.2 3.0 250 250v/10a / / / /
·wmz12a（ⅲ）高压ptc热敏电阻，用于485，232等接口电路保护
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-120g601rh021 600±25% 21 39 0.2 420 7.0 5.0 5.0 0.6
2 wmz12a-120g151rh050 150±25% 50 100 2.0 12.5 7.0 5.0 0.6
3 wmz12a-120g151rh043 150±25% 43 86 1.4 8.5 7.0 5.0 0.6
4 wmz12a-120g131rh045 130±25% 45 90 1 7.5 7.0 5.0 0.6
5 wmz12a-120g121rh056 120±25% 56 112 2.0 12.5 7.0 5.0 0.6
6 wmz12a-120g121rh049 120±25% 49 97 1.4 8.5 7.0 5.0 0.6
7 wmz12a-120g80rh069 80±25% 69 137 2.0 12.5 7.0 5.0 0.6
8 wmz12a-120g70rh064 70±25% 64 127 1.4 8.5 7.0 5.0 0.6
9 wmz12a-120g50rh087 50±25% 87 173 2.0 12.5 7.0 5.0 0.6
10 wmz12a-120g25rh123 25±25% 123 245 2.0 12.5 7.0 5.0 0.6
11 wmz12a-120g561rh022 560±25% 22 44 0.3 450 7.0 5.0 5.0 0.6
12 wmz12a-120g381rh030 380±25% 30 56 0.3 7.0 5.0 5.0 0.6
13 wmz12a-120g251rh032 250±25% 32 65 0.3 7.0 5.0 5.0 0.6
14 wmz12a-115g112rh016 1100±25% 16 32 1.0 550 8.5 7.0 5.0 0.6
15 wmz12a-115g102rh015 1000±25% 15 30 0.1 7.0 5.0 5.0 0.6
16 wmz12a-115g501rh028 500±25% 28 55 1.4 12.5 7.0 5.0 0.6
17 wmz12a-120g152rh012 1500±25% 12 24 0.1 7.0 5.0 5.0 0.6
18 wmz12a-120g122rh015 1200±25% 15 30 0.1 7.0 5.0 5.0 0.6
19 wmz12a-120g501rh024 500±25% 24 48 1.0 8.5 7.0 5.0 0.6
20 wmz12a-90g132rh013 1300±25% 13 26 0.3 600 7.0 5.0 5.0 0.6
21 wmz12a-90g102rh015 1000±25% 15 30 0.3 7.0 5.0 5.0 0.6
22 wmz12a-90g801rh018 800±25% 18 36 0.3 7.0 5.0 5.0 0.6
23 wmz12a-100g272rh010 2700±25% 10 20 0.2 7.0 5.0 5.0 0.6
24 wmz12a-100g152rh014 1500±25% 14 28 0.2 7.0 5.0 5.0 0.6
25 wmz12a-110g752rh008 7500±25% 8 17 0.5 1000 12.5 7.0 5.0 0.6
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WMZ12A型PTC热敏电阻
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1.应用范围：
wmz12a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wmz12a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。
wmz12a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：
①产品系列：wmz12a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：
·wmz12a（i）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 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℃ 160 15±20% 1.0 8 5 0.6 5
wmz12a-70lb12rm090 90ma at 40℃±2℃ 180 12±20%
wmz12a-70lb10rm100 100ma at 40℃±2℃ 200 10±20%
wmz12a-75s222rm005 5 10 2200±20% 0.2 4
4.5 0.5 5
wmz12a-75s152rm006 6 12 1500±20%
wmz12a-75s102rm008 8 16 1000±20%
wmz12a-75s681rm010 10 20 680±20%
wmz12a-75s471rm012 12 24 470±20% 0.3
wmz12a-75s331rm015 15 30 330±20%
wmz12a-75s221rm018 18 36 220±20%
wmz12a-75s151rm020 20 40 150±20% 0.4
wmz12a-75s101rm025 25 50 100±20%
wmz12a-75a471rm014 14 28 470±20% 0.4 6.5 4.5 0.6 5
wmz12a-75a331rm017 17 34 330±20%
wmz12a-75a221rm020 20 40 220±20% 0.5
wmz12a-75a151rm024 24 48 150±20%
wmz12a-75a121rm026 26 52 121 ±20%
wmz12a-75a101rm028 28
56 100±20% 0.6
wmz12a-75a68rm032 32 64 68±20%
wmz12a-75a47rm040 40 80 47±20%
wmz12a-75b331rm020 20 40 330±20% 0.8 8 4.5 0.6 5
wmz12a-75b221rm025 25 50 220±20%
wmz12a-75b151rm030 30 60 150±20%
wmz12a-75b101rm035 35 70 100±20% 1.0
wmz12a-75b82rm040 40 80 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-85b151rm35 35 70 150±20%
0.8 8 4.5 0.6 5
wmz12a-85b121rm040 40 80 120±20%
wmz12a-85b101rm045 45 90 100±20%
0.9
wmz12a-85b82rm050 50 100 82±20%
wmz12a-85b70rm045* 45ma at 60℃±2℃
90ma at 25℃±2℃
70±20%
1.2
wmz12a-85b47rm055 55ma at 60℃±2℃
110ma at 25℃±2℃
47±20%
wmz12a-85b25rm065* 65ma at 60℃±2℃
130ma at 25℃±2℃
25±20%
wmz12a-85lb68rm060 60 120 68±20% 1.2 9 4.5 0.6 5
wmz12a-85lb47rm065 65 130 47±20%
wmz12a-85lb39rm070 70 140 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-105s102rm015 15ma at 60℃±2℃ 35ma 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-120lb25rm110 110ma at 60℃±2℃ 270ma at 25℃±2℃ 25±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-120sl22rm180 180ma at 60℃±2℃ 360ma at 25℃±2℃ 22±20% 2.5 15 5 0.6 5
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℃ 320ma 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%
·wmz12a（ⅱ）主要用于防雷,通信机过流保护
其它电性能参数：
耐工频电流能力：3arms 220vrms20times
耐雷击波能力：10/310μs 1.5kv37.5a 10times
10/1000μs 1.0kv25a 30times
耐电压能力：250vrms 3arms 15min
恢复时间：≤60s
耐高压感应能力：650vrms 1.1arms 20times
序号 型号 额定零功率电阻 最大不动作电流
int（ma） 最大电流下
的动作时间 最大电流
imax 最大电压
vmax 失效模式 外形尺寸(mm)
r25(ω) at 40℃ t(sec) (a) (v) dmax tmax f±1 dmax
1 wmz12a-10rm100 10±20% 100 < 0.2 3.0 250 250v/10a 7.5 4.0 5.0 0.6
2 wmz12a-12rm100 12±20% 100 < 0.3 2.0 250 250v/10a 9.0 5.0 5.0 0.6
3 wmz12a-12rm060 12±20% 60 < 0.2 2.0 250 250v/10a 9.0 5.0 5.0 0.6
4 wmz12a-20rm080 10±20% 80 < 0.2 3.0 250 250v/10a 9.0 4.0 5.0 0.6
5 wmz12a-35rm075 35±20% 75 < 0.2 3.0 250 250v/5a 9.0 5.0 5.0 0.6
6 wmz12a-40rm070 40±20% 70 < 0.2 3.0 250 250v/5a 9.0 5.0 5.0 0.6
7 wmz12a-50rm060 50±20% 60 < 0.2 3.0 250 250v/5a 9.0 5.0 5.0 0.6
8 wmz12a-50rm060 50±20% 60 < 0.2 3.0 650 650v/10a 9.5 5.0 5.0 0.6
9 wmz12a-55rm060 55±20% 60 < 0.2 3.0 650 650v/10a 9.5 5.0 5.0 0.6
10 wmz12a-9r0m130 9±20% 130 < 0.8 3.0 250 250v/10a 10.5 4.5 5.0 0.6
11 wmz12a-25rm080 25±20% 80 < 0.2 3.0 250 250v/10a 6.6 4.0 5.0 0.6
12 wmz12a-25rm100 25±20% 100 < 0.4 3.0 250 250v/10a 8.2 4.0 5.0 0.6
13 wmz12a-10rm130 10±20% 130 < 0.5 3.0 250 250v/10a 9.5 4.5 5.0 0.6
14 wmz12a-12rm090 12±20% 90 < 0.3 2.0 250 250v/10a 9.5 4.5 5.0 0.6
15 wmz12a-15rm070 15±20% 70 < 0.2 2.0 250 250v/10a 9.5 4.5 5.0 0.6
16 wmz12a-18rm110 18±20% 110 < 0.4 3.0 250 250v/10a 9.5 4.5 5.0 0.6
17 wmz12a-20rm070 20±20% 70 < 0.2 3.0 250 250v/10a 9.5 4.5 5.0 0.6
18 wmz12a-35rm060 35±20% 60 < 0.2 3.0 250 250v/10a 9.5 4.5 5.0 0.6
19 wmz12a-50rm060 50±20% 60 < 0.2 3.0 250 250v/10a 11 4.5 5.0 0.6
20 wmz12a-55rm060 55±20% 60 < 0.2 3.0 250 250v/10a 11 4.5 5.0 0.6
21 wmz12a-101rm050 100±20% 50 < 0.1 3.0 250 250v/10a 9.0 4.5 5.0 0.6
22 wmz12a-10rm140smd 10±20% 140 < 5.0 1.0 250 250v/10a / / / /
23 wmz12a-9r0m130smd 9±20% 130 < 0.5 3.0 250 250v/10a / / / /
24 wmz12a-25rm100smd 25±20% 100 < 0.3 3.0 250 250v/10a / / / /
25 wmz12a-25rm100smd 25±20% 100 < 0.4 3.0 300 300v/10a / / / /
26 wmz12a-39rm070smd 39±20% 70 < 0.3 3.0 300 300v/10a / / / /
27 wmz12a-50rm070smd 50±20% 70 < 0.2 3.0 250 250v/5a / / / /
28 wmz12a-50rm060smd 50±20% 60 < 0.2 3.0 600 600v/5a / / / /
29 wmz12a-55rm050smd 55±20% 50 < 0.2 3.0 600 600v/5a / / / /
30 wmz12a-20rm080smd 20±20% 80 < 0.2 3.0 250 250v/10a / / / /
·wmz12a（ⅲ）高压ptc热敏电阻，用于485，232等接口电路保护
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-120g601rh021 600±25% 21 39 0.2 420 7.0 5.0 5.0 0.6
2 wmz12a-120g151rh050 150±25% 50 100 2.0 12.5 7.0 5.0 0.6
3 wmz12a-120g151rh043 150±25% 43 86 1.4 8.5 7.0 5.0 0.6
4 wmz12a-120g131rh045 130±25% 45 90 1 7.5 7.0 5.0 0.6
5 wmz12a-120g121rh056 120±25% 56 112 2.0 12.5 7.0 5.0 0.6
6 wmz12a-120g121rh049 120±25% 49 97 1.4 8.5 7.0 5.0 0.6
7 wmz12a-120g80rh069 80±25% 69 137 2.0 12.5 7.0 5.0 0.6
8 wmz12a-120g70rh064 70±25% 64 127 1.4 8.5 7.0 5.0 0.6
9 wmz12a-120g50rh087 50±25% 87 173 2.0 12.5 7.0 5.0 0.6
10 wmz12a-120g25rh123 25±25% 123 245 2.0 12.5 7.0 5.0 0.6
11 wmz12a-120g561rh022 560±25% 22 44 0.3 450 7.0 5.0 5.0 0.6
12 wmz12a-120g381rh030 380±25% 30 56 0.3 7.0 5.0 5.0 0.6
13 wmz12a-120g251rh032 250±25% 32 65 0.3 7.0 5.0 5.0 0.6
14 wmz12a-115g112rh016 1100±25% 16 32 1.0 550 8.5 7.0 5.0 0.6
15 wmz12a-115g102rh015 1000±25% 15 30 0.1 7.0 5.0 5.0 0.6
16 wmz12a-115g501rh028 500±25% 28 55 1.4 12.5 7.0 5.0 0.6
17 wmz12a-120g152rh012 1500±25% 12 24 0.1 7.0 5.0 5.0 0.6
18 wmz12a-120g122rh015 1200±25% 15 30 0.1 7.0 5.0 5.0 0.6
19 wmz12a-120g501rh024 500±25% 24 48 1.0 8.5 7.0 5.0 0.6
20 wmz12a-90g132rh013 1300±25% 13 26 0.3 600 7.0 5.0 5.0 0.6
21 wmz12a-90g102rh015 1000±25% 15 30 0.3 7.0 5.0 5.0 0.6
22 wmz12a-90g801rh018 800±25% 18 36 0.3 7.0 5.0 5.0 0.6
23 wmz12a-100g272rh010 2700±25% 10 20 0.2 7.0 5.0 5.0 0.6
24 wmz12a-100g152rh014 1500±25% 14 28 0.2 7.0 5.0 5.0 0.6
25 wmz12a-110g752rh008 7500±25% 8 17 0.5 1000 12.5 7.0 5.0 0.6
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