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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
|
最大不动作电流In
|
25℃保护电流
|
额定零功率电阻值
|
最大工作电流
|
外形尺寸(mm)
|
25℃
|
40℃
|
60℃
|
It
|
R25
|
I max
|
Dmax
|
Tmax
|
d±0.05
|
F±1
|
(mA)
|
(mA)
|
(Ω)
|
(A)
|
WMZ12A-70LB15RM080
|
|
80
|
|
160
|
15±20%
|
1.0
|
8
|
5
|
0.6
|
5
|
WMZ12A-70LB12RM090
|
|
90
|
|
180
|
12±20%
|
WMZ12A-70LB10RM100
|
|
100
|
|
200
|
10±20%
|
WMZ12A-75S222RM004
|
4
|
|
2
|
10
|
2200±20%
|
0.2
|
4
|
4.5
|
0.5
|
5
|
WMZ12A-75S152RM005
|
5
|
|
3
|
12
|
1500±20%
|
WMZ12A-75S102RM007
|
7
|
|
4
|
16
|
1000±20%
|
WMZ12A-75S681RM009
|
9
|
|
5
|
20
|
680±20%
|
WMZ12A-75S471RM010
|
10
|
|
6
|
24
|
470±20%
|
0.3
|
WMZ12A-75S331RM013
|
13
|
|
7
|
30
|
330±20%
|
WMZ12A-75S221RM016
|
16
|
|
9
|
36
|
220±20%
|
WMZ12A-75S151RM018
|
18
|
|
10
|
40
|
150±20%
|
0.4
|
WMZ12A-75S101RM022
|
22
|
|
12
|
50
|
100±20%
|
WMZ12A-75A471RM012
|
12
|
|
7
|
28
|
470±20%
|
0.4
|
6.5
|
4.5
|
0.6
|
5
|
WMZ12A-75A331RM015
|
15
|
|
8
|
34
|
330±20%
|
WMZ12A-75A221RM017
|
17
|
|
10
|
40
|
220±20%
|
0.5
|
WMZ12A-75A151RM020
|
20
|
|
12
|
48
|
150±20%
|
WMZ12A-75A121RM022
|
22
|
|
13
|
52
|
121 ±20%
|
WMZ12A-75A101RM024
|
24
|
|
14
|
56
|
100±20%
|
0.6
|
WMZ12A-75A68RM028
|
28
|
|
16
|
64
|
68±20%
|
WMZ12A-75A47RM035
|
35
|
|
20
|
80
|
47±20%
|
WMZ12A-75B331RM015
|
15
|
|
10
|
40
|
330±20%
|
0.8
|
8
|
4.5
|
0.6
|
5
|
WMZ12A-75B221RM020
|
20
|
|
12
|
50
|
220±20%
|
WMZ12A-75B151RM025
|
25
|
|
15
|
60
|
150±20%
|
WMZ12A-75B101RM027
|
27
|
|
18
|
70
|
100±20%
|
1.0
|
WMZ12A-75B82RM030
|
30
|
|
20
|
80
|
82±20%
|
WMZ12A-75LB82RM035
|
35
|
|
24
|
90
|
82±20%
|
1.0
|
9
|
4.5
|
0.6
|
5
|
WMZ12A-75LB68RM040
|
40
|
|
27
|
100
|
68±20%
|
1.2
|
WMZ12A-75LB47RM045
|
45
|
|
30
|
110
|
47±20%
|
WMZ12A-75LB33RM050
|
50
|
|
35
|
130
|
33±20%
|
WMZ12A-75LB22RM060
|
60
|
|
40
|
150
|
22±20%
|
1.5
|
WMZ12A-75LB18RM065
|
65
|
|
45
|
170
|
18±20%
|
WMZ12A-75LB15RM070
|
70
|
|
50
|
190
|
15±20%
|
WMZ12A-75LB10RM080
|
80
|
|
55
|
210
|
10±20%
|
WMZ12A-80S222RM004
|
4
|
|
2
|
8
|
2200±20%
|
0.2
|
4.5
|
5.0
|
0.6
|
5
|
WMZ12A-80S152RM006
|
6
|
|
3
|
12
|
1500±20%
|
WMZ12A-80S102RM008
|
8
|
|
4
|
16
|
1000±20%
|
WMZ12A-80S681RM010
|
10
|
|
5
|
20
|
680±20%
|
WMZ12A-80S471RN012
|
12
|
|
6
|
24
|
470±30%
|
WMZ12A-80S201RH018
|
18
|
|
9
|
36
|
200±25%
|
WMZ12A-80S151RH020
|
20
|
|
10
|
40
|
200±25%
|
WMZ12A-80LB50RM060
|
60
|
|
45
|
120
|
50±20%
|
1.2
|
9
|
5
|
0.6
|
5
|
WMZ12A-85A30RM060
|
60
|
|
30
|
120
|
30±20%
|
0.8
|
6.5
|
5.0
|
0.6
|
5
|
WMZ12A-85A40RM052
|
52
|
|
26
|
104
|
50±20%
|
0.8
|
WMZ12A-85A50RM050
|
50
|
|
25
|
100
|
50±20%
|
0.8
|
WMZ12A-85A70RM045
|
45
|
|
20
|
90
|
70±20%
|
0.4
|
WMZ12A-85A101RM038
|
38
|
|
17
|
76
|
100±20%
|
0.4
|
WMZ12A-85A121RM032
|
32
|
|
15
|
65
|
180±20%
|
0.4
|
WMZ12A-85A151RM030
|
30
|
|
14
|
60
|
180±20%
|
0.4
|
WMZ12A-85A251RM022
|
22
|
|
10
|
44
|
250±20%
|
0.4
|
WMZ12A-85A681RM015
|
15
|
|
7
|
30
|
680±20%
|
0.4
|
WMZ12A-85A102RM09
|
9
|
|
4.5
|
19
|
1000±20%
|
0.4
|
WMZ12A-85B151RM035
|
35
|
|
20
|
70
|
150±20%
|
0.8
|
8
|
4.5
|
0.6
|
5
|
WMZ12A-85B121RM040
|
40
|
|
22
|
80
|
120±20%
|
WMZ12A-85B101RM045
|
45
|
|
25
|
90
|
100±20%
|
0.9
|
WMZ12A-85B82RM050
|
50
|
|
30
|
100
|
82±20%
|
WMZ12A-85B68RM055
|
55
|
|
35
|
112
|
68±20%
|
1.2
|
WMZ12A-85B47RM070
|
70
|
|
40
|
140
|
47±20%
|
WMZ12A-85B25RM080
|
80
|
|
45
|
160
|
25±20%
|
WMZ12A-85LB68RM060
|
60
|
|
35
|
120
|
68±20%
|
1.2
|
9
|
4.5
|
0.6
|
5
|
WMZ12A-85LB47RM065
|
65
|
|
37
|
130
|
47±20%
|
WMZ12A-85LB39RM070
|
70
|
|
40
|
140
|
39±20%
|
WMZ12A-85LB33RM075
|
75
|
|
42
|
150
|
33±20%
|
WMZ12A-85LB25RM080
|
80
|
|
45
|
160
|
25±20%
|
1.5
|
WMZ12A-85LB22RM085
|
85
|
|
48
|
170
|
22±20%
|
WMZ12A-85LB18RM090
|
90
|
|
50
|
180
|
18±20%
|
WMZ12A-85LB15RM098
|
98
|
|
56
|
196
|
15±20%
|
WMZ12A-85LB12RM105
|
105
|
|
60
|
210
|
12±20%
|
WMZ12A-85LB10RM115
|
115
|
|
65
|
230
|
10±20%
|
WMZ12A-95LB22RM110
|
110
|
|
60
|
220
|
22±20%
|
WMZ12A-100B131RM065
|
65
|
|
45
|
130
|
130±20%
|
1.2
|
8.5
|
5.0
|
0.6
|
5
|
WMZ12A-100B70RM070
|
70
|
|
50
|
140
|
70±20%
|
WMZ12A-100B60RM080
|
80
|
|
55
|
160
|
60±20%
|
2.0
|
WMZ12A-100B50RM090
|
90
|
|
60
|
180
|
50±20%
|
WMZ12A-100B22RM130
|
120
|
|
85
|
240
|
22±20%
|
WMZ12A-105S102RM018
|
18
|
|
15
|
35
|
1000±20%
|
0.25
|
4.5
|
4.5
|
0.5
|
5
|
WMZ12A-105S221RM025
|
25
|
|
20
|
50
|
220±20%
|
WMZ12A-105S151RM036
|
36
|
|
25
|
65
|
150±20%
|
WMZ12A-105S101RM038
|
38
|
|
30
|
75
|
100±20%
|
WMZ12A-105L221RM030
|
30
|
|
25
|
65
|
220±20%
|
0.3
|
5.5
|
4.5
|
0.5
|
5
|
WMZ12A-105L151RM036
|
38
|
|
30
|
75
|
150±20%
|
WMZ12A-105L121RM045
|
45
|
|
35
|
90
|
120±20%
|
WMZ12A-105L101RM050
|
50
|
|
40
|
100
|
100±20%
|
WMZ12A-105L75RM050
|
50
|
|
45
|
100
|
75±20%
|
WMZ12A-105L68RM060
|
60
|
|
50
|
120
|
68±20%
|
WMZ12A-105L47RM070
|
70
|
|
55
|
140
|
47±20%
|
WMZ12A-105A221RM030
|
30
|
|
25
|
65
|
220±20%
|
0.4
|
5.5
|
4.5
|
0.5
|
5
|
WMZ12A-105A151RM045
|
45
|
|
35
|
90
|
150±20%
|
WMZ12A-105A101RM60
|
60
|
|
45
|
120
|
100±20%
|
WMZ12A-105A68RM070
|
70
|
|
55
|
140
|
68±20%
|
WMZ12A-105B151RM055
|
55
|
|
45
|
113
|
150±20%
|
0.8
|
8
|
4.5
|
0.6
|
5
|
WMZ12A-105B121RM060
|
60
|
|
50
|
125
|
120±20%
|
WMZ12A-105B101RM070
|
70
|
|
55
|
138
|
100±20%
|
WMZ12A-105B82RM075
|
75
|
|
60
|
150
|
82±20%
|
0.9
|
WMZ12A-105B62RM095
|
95
|
|
75
|
188
|
62±20%
|
WMZ12A-105LB39RM105
|
105
|
|
85
|
213
|
39±20%
|
1.2
|
9
|
4.5
|
0.6
|
5
|
WMZ12A-105LB22RM125
|
125
|
|
100
|
250
|
22±20%
|
WMZ12A-105LB15RM140
|
140
|
|
110
|
275
|
15±20%
|
WMZ12A-105LB10RM150
|
150
|
|
120
|
300
|
22±20%
|
WMZ12A-105M22RM120
|
120
|
|
100
|
240
|
22±20%
|
1.6
|
12
|
4.5
|
0.6
|
5
|
WMZ12A-105M15RM130
|
150
|
|
120
|
300
|
15±20%
|
WMZ12A-105M10RM160
|
160
|
|
130
|
320
|
10±20%
|
WMZ12A-105M8R2M175
|
175
|
|
150
|
350
|
8.2±20%
|
WMZ12A-105SL18RM190
|
190
|
|
150
|
375
|
18±20%
|
2.5
|
15
|
5
|
0.8
|
7.5
|
WMZ12A-105SL15RM200
|
200
|
|
160
|
400
|
15±20%
|
WMZ12A-105SL12RM210
|
210
|
|
170
|
425
|
12±20%
|
WMZ12A-105SL10RM225
|
225
|
|
180
|
450
|
10±20%
|
WMZ12A-105SL8R2M240
|
240
|
|
190
|
480
|
8.2±20%
|
WMZ12A-105SL6R8M250
|
250
|
|
200
|
500
|
6.8±20%
|
WMZ12A-120L101RM040
|
40
|
|
32
|
80
|
100±20%
|
0.3
|
5.5
|
4.5
|
0.6
|
5
|
WMZ12A-120L75RM045
|
45
|
|
36
|
90
|
75±20%
|
WMZ12A-120L62RM050
|
50
|
|
40
|
100
|
62±20%
|
WMZ12A-120A102RM015
|
15
|
|
16
|
40
|
1000±20%
|
0.4
|
6.5
|
5
|
0.6
|
5
|
WMZ12A-120A301RM020
|
20
|
|
20
|
50
|
300±20%
|
WMZ12A-120A151RM040
|
40
|
|
32
|
80
|
150±20%
|
WMZ12A-120A121RM045
|
45
|
|
36
|
90
|
120±20%
|
WMZ12A-120A101RM050
|
50
|
|
40
|
100
|
100±20%
|
WMZ12A-120A82RM055
|
55
|
|
45
|
110
|
100±20%
|
WMZ12A-120A65RM060
|
60
|
|
50
|
120
|
65±20%
|
WMZ12A-120A47RM070
|
70
|
|
60
|
140
|
47±20%
|
WMZ12A-120A35RM085
|
85
|
|
68
|
170
|
35±20%
|
WMZ12A-120B251RM037
|
37
|
|
30
|
75
|
250±20%
|
0.9
|
8
|
5
|
0.6
|
5
|
WMZ12A-120B121RM055
|
55
|
|
45
|
110
|
121±20%
|
WMZ12A-120B101RM060
|
60
|
|
50
|
120
|
100±20%
|
WMZ12A-120B68RM075
|
75
|
|
60
|
150
|
68±20%
|
WMZ12A-120B47RM085
|
85
|
|
75
|
170
|
47±20%
|
WMZ12A-120B33RM105
|
105
|
|
85
|
210
|
33±20%
|
WMZ12A-120B25RM120
|
120
|
|
100
|
240
|
25±20%
|
WMZ12A-120B18RM140
|
140
|
|
120
|
280
|
18±20%
|
WMZ12A-125LB111RM070
|
70
|
|
60
|
140
|
110±20%
|
1.2
|
9
|
5
|
0.6
|
5
|
WMZ12A-125LB82RM080
|
80
|
|
70
|
160
|
82±20%
|
WMZ12A-125LB62RM095
|
95
|
|
80
|
240
|
62±20%
|
WMZ12A-125LB50RM120
|
105
|
|
90
|
240
|
50±20%
|
WMZ12A-125LB39RM120
|
120
|
|
100
|
240
|
39±20%
|
WMZ12A-125LB25RM145
|
145
|
|
125
|
290
|
25±20%
|
WMZ12A-125LB18RM170
|
170
|
|
145
|
340
|
18±20%
|
WMZ12A-125LB15RM135
|
185
|
|
160
|
370
|
15±20%
|
WMZ12A-125LB10RM230
|
230
|
|
195
|
460
|
10±20%
|
WMZ12A-120M181RM045
|
45
|
|
37
|
90
|
180±20%
|
1.6
|
12
|
5
|
0.6
|
5
|
WMZ12A-120M101RM060
|
60
|
|
49
|
120
|
100±20%
|
WMZ12A-120M82RM070
|
70
|
|
55
|
140
|
82±20%
|
WMZ12A-120M60RM080
|
80
|
|
62
|
160
|
60±20%
|
WMZ12A-120M47RM090
|
90
|
|
70
|
180
|
47±20%
|
WMZ12A-120M39RM100
|
100
|
|
80
|
200
|
39±20%
|
WMZ12A-120M33RM110
|
110
|
|
90
|
220
|
33±20%
|
WMZ12A-120M22RM115
|
115
|
|
100
|
300
|
22±20%
|
WMZ12A-120M15RM140
|
140
|
|
123
|
325
|
15±20%
|
WMZ12A-120M10RM170
|
170
|
|
150
|
350
|
10±20%
|
WMZ12A-120M8R2M190
|
190
|
|
165
|
380
|
8.2±20%
|
WMZ12A-120SL45RM120
|
120
|
|
120
|
300
|
45±20%
|
2.5
|
15
|
5
|
0.6
|
5
|
WMZ12A-120SL22RM180
|
180
|
|
140
|
360
|
22±20%
|
WMZ12A-120SL15RM200
|
200
|
|
160
|
400
|
15±20%
|
WMZ12A-120SL12RM210
|
210
|
|
170
|
420
|
12±20%
|
WMZ12A-120SL10RM220
|
220
|
|
180
|
440
|
10±20%
|
WMZ12A-120SL8R2M240
|
240
|
|
190
|
480
|
8.2±20%
|
WMZ12A-120SL6R8M260
|
260
|
|
200
|
520
|
6.8±20%
|
WMZ12A-120ML30RH185
|
185
|
|
150
|
370
|
30.0±20%
|
3.1
|
18.0
|
5
|
0.6
|
5
|
WMZ12A-120ML22RM220
|
220
|
|
170
|
440
|
22.0±20%
|
WMZ12A-120ML15RM260
|
260
|
|
219
|
525
|
15.0±20%
|
WMZ12A-120ML10RM320
|
320
|
|
250
|
625
|
10.0±20%
|
WMZ12A-120ML8R2M360
|
360
|
|
290
|
725
|
8.2±20%
|
WMZ12A-120ML6R8M390
|
390
|
|
310
|
790
|
6.8±20%
|
WMZ12A-120ML6R0M420
|
420
|
|
330
|
840
|
6.0±20%
|
WMZ12A-120ML5R0M460
|
460
|
|
360
|
920
|
5±20%
|
WMZ12A-120ML4R7M470
|
470
|
|
370
|
925
|
4.7±20%
|
WMZ12A-120ML3R3M560
|
560
|
|
450
|
1125
|
3.3±20%
|
WMZ12A-120LL12RM360
|
360
|
|
280
|
710
|
12±20%
|
20
|
24
|
5
|
0.8
|
7.5
|
WMZ12A-120LL10RM390
|
390
|
|
310
|
780
|
10±20%
|
WMZ12A-120LL8R2M430
|
430
|
|
340
|
860
|
8.2±20%
|
40
|
WMZ12A-120LL7R0M480
|
480
|
|
370
|
930
|
7.0±20%
|
WMZ12A-120LL6R8M470
|
470
|
|
380
|
940
|
6.8±20%
|
WMZ12A-120LL5R0M500
|
500
|
|
440
|
1100
|
5.0±20%
|
WMZ12A-120LL4R7M560
|
560
|
|
450
|
1135
|
4.7±20%
|
50
|
WMZ12A-120LL3R6M650
|
650
|
|
520
|
1300
|
3.6±20%
|
WMZ12A-120LL3R3M680
|
680
|
|
540
|
1350
|
3.3±20%
|
WMZ12A-120LL2R2M830
|
830
|
|
660
|
1660
|
2.2±20%
|
100
|
WMZ12A-120LL1R5M1000
|
1000
|
|
800
|
2010
|
1.5±20%
|
WMZ12A-120BL12RM450
|
450
|
|
355
|
890
|
12±20%
|
100
|
28
|
5
|
0.8
|
7.5
|
WMZ12A-120BL10RM490
|
490
|
|
390
|
970
|
10±20%
|
WMZ12A-120BL8R2M540
|
540
|
|
430
|
1080
|
8.2±20%
|
WMZ12A-120BL7R0M590
|
590
|
|
470
|
1170
|
7.0±20%
|
WMZ12A-120BL6R8M600
|
600
|
|
470
|
1180
|
6.8±20%
|
WMZ12A-120BL5R0M690
|
690
|
|
550
|
1380
|
5.0±20%
|
WMZ12A-120BL4R7M720
|
720
|
|
570
|
1430
|
4.7±20%
|
WMZ12A-120BL3R6M820
|
820
|
|
660
|
1640
|
3.6±20%
|
WMZ12A-120BL3R3M850
|
850
|
|
680
|
1700
|
3.3±20%
|
WMZ12A-120BL2R2M1050
|
1050
|
|
830
|
2080
|
2.2±20%
|
WMZ12A-120BL1R5M1300
|
1300
|
|
1000
|
2530
|
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
|
|