I#1 - Under Ul1449 limited current testing parts rated >420V will not open due to 600V voltage limit. Devices with ratings >420V have not yet been evaluated.
CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the device
at these or any other conditions above those indicated in the operational sections of this specification is not implied.
Device Ratings and Specifications - TMOV Varistor Series
™
CONTINUOUS
AC
VOLTS
PART
NUMBER
V M(AC)RMS
(V)
DC
VOLTS
VM(AC)
MAXIMUM RATING (85°C)
TRANSIENT
PEAK SURGE
MCOV
ENERGY
CURRENT
SURGE
ARRESTER
2ms
8/20µs
ITM
WTM
VM(AC)RMS 1 x PULSE 1 x PULSE
(V)
(J)
(A)
SPECIFICATIONS (25°C)
MAXIMUM
VARISTOR
CLAMPING VOLTAGE
VOLTAGE AT 1mA
8/20µs at
200A
TEST CURRENT
VN(DC)
MIN
(V)
V N(DC)
MAX
VC
(V)
TYPICAL
CAPACITANCE
f = 1MHz
C
(pF)
TMOV34S111M
TMOV34S131M
TMOV34S141M
TMOV34S151M
TMOV34S181M
TMOV34S201M
TMOV34S251M
TMOV34S271M
TMOV34S301M
TMOV34S321M
TMOV34S331M
TMOV34S351M
TMOV34S391M
TMOV34S421M
6
TMOV34S461M
6
TMOV34S481M
6
TMOV34S511M
6
TMOV34S551M
6
TMOV34S571M
6
TMOV34S621M
6
TMOV34S661M
6
TMOV34S681M
6
TMOV34S751M
6
96
115
130
140
150
180
200
250
275
300
320
330
350
385
420
460
480
510
550
575
620
660
680
750
150
175
188
200
240
265
330
369
400
420
435
460
506
560
610
640
675
700
730
800
850
890
970
98
111
119
128
153
170
213
234
255
272
281
298
327
357
391
408
434
468
489
527
561
578
638
235
270
291
300
330
335
370
400
435
460
475
500
550
600
620
650
700
735
770
840
900
950
1050
40000
1
40000
2
40000
3
40000
4
40000
5
40000
40000
40000
40000
40000
40000
40000
40000
40000
40000
40000
40000
40000
40000
40000
40000
40000
40000
163
184
198
212
254
283
354
389
433
462
476
505
555
610
642
670
735
770
805
880
940
980
1080
202
228
248
268
312
357
429
473
528
561
581
616
678
748
783
825
910
939
1000
1074
1160
1195
1320
305
345
375
405
488
540
650
730
780
830
855
910
1005
1130
1188
1240
1350
1415
1480
1589
1720
1772
2000
11500
10000
9000
8000
6800
6500
5000
4500
4050
3800
3700
3500
3300
3000
2800
2700
2500
2250
2200
2100
2000
1970
1800
w w w. l i t t e l f u s e . c o m
Varistor Products
High Energy Industrial Thermally Protected
TMOV34S
®
Varistor Series
Thermal Characteristics
10
100
Typical
PERCENT OF RATED VALUE
5A
2.5A
0.5A
0.125A
80
60
1
40
20
2
VARISTOR
PRODUCTS
97
-55
50
60
70
80
90
100
AMBIENT TEMPERATURE (ºC)
110
120
130
0.1
10
100
Time s
1000
10000
0
*
Figure 4:
Typical time to open circuit under UL1449
Abnormal Overvoltage Limited Current Test
Figure 5:
Peak Current & Energy Derating Curve
Note : The Industrial TMOV Series TMOV34S devices are intended, in
conjunction with appropriate enclosure design, to help facilitate TVSS
module compliance to UL 1449, Section 37.4 (abnormal over-voltage lim-
ited current requirements). Under these extreme abnormal over-voltage
conditions, the units will exhibit substantial heating and potential venting
prior to opening. Modules should be designed to contain this possibility.
Application testing is strongly recommended.
For applications exceeding 85ºC ambient
temperature, the peak surge current and energy
ratings must be reduced as shown in Figure 3.
Pulse Rating Curves
50,000
1
20,000
10,000
SURGE CURRENT (A)
5,000
2,000
1,000
500
200
100
50
20
10
INDEFINITE
20
100
1,000
IMPULSE DURA
TION (µs)
10,000
2
10
10
2
10
3
10
4
10
5
Hx34
10
6
FIGURE 6.
SURGE CURRENT RATING CURVES FOR
HB34, HF34 and HG34
w w w. l i t t e l f u s e . c o m
Varistor Products
High Energy Industrial Thermally Protected
TMOV34S
®
Varistor Series
Transient V-I Characteristic Curves
10000
TMOV34S
TA = -55 C to 85C
V751
V661
Voltage
Volts
V681
V511
V551
V571
1000
V481
V141 V131
V441
Current - AMPS
100
0.001
0.01
0.1
1
10
100
1000
V111
V151
10000
100000
V421
V391
V351 V331 V321 V301 V271
V251 V201 V181
Fig 7.
V-I Characteristic Curves For TMOV34S
®
Varistor
98
w w w. l i t t e l f u s e . c o m
Varistor Products
High Energy Industrial Thermally Protected
TMOV34S
®
Varistor Series
i
TMOV Varistor Application Examples
The application examples below show how the indicator lead on the
iTMOV
can be used to indicate that the thermal element has been
opened. This signifies that the circuit is no longer protected from
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