Temperature Coefficient (αV) of Clamping Voltage (VC) at Specified Test Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . <0.01
UNITS
V
V
A
J
C
O
C
%
O
C
O
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
MAXIMUM RATINGS (85
o
C)
CONTINUOUS
TRANSIENT
SPECIFICATIONS (25
o
C)
MAX
CLAMPING
VOLT V
C
AT
200A
CURRENT
(8/20µs)
V
C
(V)
350
410
680
650
620
750
730
680
850
830
760
1200
1130
1060
1300
1240
1160
1440
1350
1300
1600
1480
1420
1820
1720
1640
V
RMS
MODEL
NUMBER
V131CA32
V151CA32
V251CA32
V251CA40
V251CA60
V271CA32
V271CA40
V271CA60
V321CA32
V321CA40
V321CA60
V421CA32
V421CA40
V421CA60
V481CA32
V481CA40
V481CA60
V511CA32
V511CA40
V511CA60
V571CA32
V571CA40
V571CA60
V661CA32
V661CA40
V661CA60
SIZE
(mm)
32
32
32
40
60
32
40
60
32
40
60
32
40
60
32
40
60
32
40
60
32
40
60
32
40
60
V
M(AC)
(V)
130
150
250
V
DC
V
M(DC)
(V)
175
200
330
ENERGY
(2ms)
W
TM
(J)
200
220
330
370
880
360
400
950
390
460
1100
400
600
1500
450
650
1600
500
700
1800
550
770
2100
600
900
2300
PEAK
CURRENT
(8/20µs)
I
TM
(A)
20000
20000
20000
40000
50000
20000
40000
50000
20000
40000
50000
25000
40000
70000
25000
40000
70000
25000
40000
70000
25000
40000
70000
25000
40000
70000
VARISTOR VOLTAGE AT
1mA DC TEST CURRENT
MIN
(V)
184
212
354
V
N(DC)
(V)
200
240
390
MAX
(V)
228
268
429
TYPICAL
CAPACI-
TANCE
f = 1MHz
(pF)
4700
4000
2500
5000
10000
2200
4500
9000
1900
3800
7500
1500
3000
6000
1300
2700
5500
1200
2500
5000
1100
2200
4500
1000
2000
4000
275
369
389
430
473
320
420
462
510
561
420
560
610
680
748
480
640
670
750
825
510
675
735
820
910
575
730
805
910
1000
660
850
940
1050
1160
w w w. l i t t e l f u s e . c o m
110
Varistor Products
High Energy Industrial Disc
CA Varistor Series
Device Ratings and Specifications
(continued)
MAXIMUM RATINGS (85
o
C)
CONTINUOUS
TRANSIENT
SPECIFICATIONS (25
o
C)
MAX
CLAMPING
VOLT V
C
AT
200A
CURRENT
(8/20µs)
V
C
(V)
2050
2000
1880
2340
2940
3600
4300
5200
6200
7400
2
VARISTOR
PRODUCTS
TYPICAL
CAPACI-
TANCE
f = 1MHz
(pF)
800
1800
3500
2700
2200
1800
1500
1200
1000
800
V
RMS
MODEL
NUMBER
V751CA32
V751CA40
V751CA60
V881CA60
V112CA60
V142CA60
V172CA60
V202CA60
V242CA60
V282CA60
SIZE
(mm)
32
40
60
60
60
60
60
60
60
60
V
M(AC)
(V)
750
V
DC
V
M(DC)
(V)
970
ENERGY
(2ms)
W
TM
(J)
700
1050
2600
3200
3800
5000
6000
7500
8600
10000
PEAK
CURRENT
(8/20µs)
I
TM
(A)
25000
40000
70000
70000
70000
70000
70000
70000
70000
70000
VARISTOR VOLTAGE AT
1mA DC TEST CURRENT
MIN
(V)
1080
V
N(DC)
(V)
1200
MAX
(V)
1320
880
1100
1400
1700
2000
2400
2800
1150
1400
1750
2150
2500
3000
3500
1290
1620
2020
2500
2970
3510
4230
1500
1800
2200
2700
3300
3900
4700
1650
2060
2550
3030
3630
4290
5170
NOTE: Average power dissipation of transients not exceed 1.5W, 2.0W and 2.5W for model 32mm, 40mm and 60mm, respectively.
1. Peak current applies to applications rated up to 115V
RMS
. Peak Current is 30kA for applications greater than 115V
RMS
.
2. Peak current applies to applications rated up to 132V
RMS
. Peak Current is 30kA for applications greater than 132V
RMS
.
Power Dissipation Ratings
Should transients occur in rapid succession, the average power
dissipation result is the energy (watt-seconds) per pulse times the
number of pulses per second. The power so developed must be within
the specifications shown on the Device Ratings and Specifications table
for the specific device. Furthermore, the operating values need to be
derated at high temperatures as shown in Figure 1. Because varistors
can only dissipate a relatively small amount of average power they are,
therefore, not suitable for repetitive applications that involve substantial
amounts of average power dissipation.
PERCENT OF PEAK VALUE
100
90
50
100
PERCENT OF RATED VALUE
90
80
70
60
50
40
30
20
10
0
-55
50
60
70
80
90
100 110 120 130 140 150
10
O
1
T
T
1
TIME
T
2
O
1
= Virtual Origin of Wave
T = Time From 10% to 90% of Peak
T
1
= Virtual Front Time = 1.25 • t
T
2
= Virtual Time to Half Value (Impulse Duration)
Example: For an 8/20µs Current Waveform:
8µs = T
1
= Virtual Front Time
20µs = T
2
= Virtual Time to Half Value
FIGURE 2. PEAK PULSE CURRENT TEST WAVEFORM
AMBIENT TEMPERATURE (
o
C)
FIGURE 1. CURRENT, ENERGY AND POWER DERATING
CURVE
111
w w w. l i t t e l f u s e . c o m
Varistor Products
High Energy Industrial Disc
CA Varistor Series
Transient V-I Characteristics Curves
6,000
5,000
4,000
MAXIMUM PEAK VOLTS (V)
3,000
2,000
MAXIMUM CLAMPING VOLTAGE
DISC SIZE 32mm
130 TO 750 V
M(AC)
RATING
MAXIMUM PEAK VOLTS (V)
T
A
= -55
o
C TO 85
o
C
6,000
5,000
4,000
3,000
MAXIMUM CLAMPING VOLTAGE
DISC SIZE 40mm
130 TO 750 V
M(AC)
RATING
V751CA40
V661CA40
V571CA40
T
A
= -55
o
C TO 85
o
C
V751CA32
V661CA32
V571CA32
1,000 V511CA32
900 V481CA32
800 V421CA32
700
600 V321CA32
500 V271CA32
V251CA32
400
300 V151CA32
V131CA32
200
10
-3
10
-2
10
-1
10
0
10
1
10
2
PEAK AMPERES
10
3
10
4
10
5
V511CA40
V481CA40
2,000 V421CA40
1,000
900
800
700
600
V321CA40
500
V271CA40
V251CA40
400
300
V151CA40
V131CA40
200
10
-1
10
-2
10
0
10
1
10
2
PEAK AMPERES
10
3
10
4
10
5
FIGURE 3. CLAMPING VOLTAGE FOR V131CA32 - C751CA32
FIGURE 4. CLAMPING VOLTAGE FOR V131CA40 - V751CA40
6,000
5,000
4,000
MAXIMUM PEAK VOLTS (V)
3,000
2,000
MAX CLAMPING VOLTAGE
DISC SIZE 60mm
250 TO 880V
M(AC)
RATING
T
A
= -55
o
C TO 85
o
C
V881CA60
V751CA60
V661CA60
V571CA60
30,000
V511CA60
V481CA60
V421CA60
20,000
MAX CLAMPING VOLTAGE
DISC SIZE 60mm
1100 TO 2800V
M(AC)
RATING
T
A
= -55
o
C TO 85
o
C
MAX PEAK VOLTS (V)
1,000
900
800
700
600
V321CA60
500
V271CA60
V251CA60
400
300
200
10
-2
10
-1
10
0
10
1
10
2
10
3
PEAK AMPERES (A)
10
4
10
5
10,000
9,000
8,000
7,000
6,000
V282CA60
5,000
V242CA60
4,000
V202CA60
3,000
V142CA60
V112CA60
V172CA60
2,000
10
-2
10
-1
10
0
10
1
10
2
PEAK AMPERES (A)
10
3
10
4
10
5
FIGURE 5. CLAMPING VOLTAGE FOR V251CA60 - V881CA60
FIGURE 6. CLAMPING VOLTAGE FOR V112CA60 - V282CA60
w w w. l i t t e l f u s e . c o m
112
Varistor Products
High Energy Industrial Disc
CA Varistor Series
Pulse Rating Curves
50,000
20,000
10,000
SURGE CURRENT (A)
5,000
2,000
1
2
10
10
2
10
5
SURGE CURRENT (A)
10
6
DISC SIZE 32mm
V131CA32 - V321CA32
50,000
20,000
10,000
5,000
10
10
5
1
2
DISC SIZE 32mm
V421CA32 - V751CA32
2
VARISTOR
PRODUCTS
10,000
10,000
10
6
2,000 10
2
1,000 10
3
500
10
4
200
100
50
20 INDEFINITE
1,000 10
3
500 10
4
200
100
50
20
10
20
INDEFINITE
100
1,000
IMPULSE DURATION (
µs)
10,000
10
20
100
1,000
IMPULSE DURATION (
µs)
FIGURE 7. SURGE CURRENT RATING CURVES FOR
V131CA32 - V321CA32
50,000
20,000
1
2
10
4
10
5
DISC SIZE 40mm
V131CA40 - V751CA40
FIGURE 8. SURGE CURRENT RATING CURVES FOR
V421CA32 - V751CA32
50,000
1
20,000
10,000
SURGE CURRENT (A)
5,000
2,000
1,000
500
200
100 10
6
50
20
10
20
INDEFINITE
100
1,000
IMPULSE DURATION (
µs)
10
2
10
3
10
4
10
5
10
2
DISC SIZE 60mm
V251CA60 - V321CA60
10,000 10
5,000
SURGE CURRENT (A)
2,000
1,000
500
200
100 10
6
50
20 INDEFINITE
10
20
100
10
2
10
3
1,000
IMPULSE DURATION (
µs)
10,000
FIGURE 9.
SURGE CURRENT RATING CURVES FOR
V131CA40 - V751CA40
100,000
50,000
20,000
10,000
SURGE CURRENT (A)
5,000
2,000
1,000
500
200
100
50
20
10
20
INDEFINITE
10
6
10
2
10
3
10
4
10
5
1
10
2
FIGURE 10. SURGE CURRENT RATING CURVES FOR
V251CA60 - V321CA60
DISC SIZE 60mm
V421CA60 - V282CA60
100
1,000
IMPULSE DURATION (
µs)
10,000
FIGURE 11. SURGE CURRENT RATING CURVES FOR
V421CA60 - V282CA60
NOTE: If pulse ratings are exceeded, a shift of VN(DC) (at specified current) of more than ±10% could result. This type of shift, which normally results in a decrease of VN(DC),
may result in the device not meeting the original published specifications, but does not prevent the device from continuing to function, and to provide ample protection.
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