Metal-Oxide Varistors
(MOVs)
High Energy Industrial Disc Varistors > CA Series
CA Varistor Series
Description
The CA Series of transient surge suppressors are industrial
high-energy disc varistors (MOVs) intended for special
applications requiring unique electrical contact or packaging
methods provided by the customer. The electrode finish
of these devices is solderable and can also be used with
pressure contacts. Discs of the same diameter may be
stacked.
This series of industrial disc varistors are nominal 60mm
diameter, with disc thickness ranging from 2.7mm to
32mm. The voltage range is 250V to 2800 V
(AC)RMS
.
For information on soldering considerations, refer to EC637
"Recommendations for Soldering Terminal Leads to MOV
Varistor Discs."
Additional Information
Features
Datasheet
Resources
Samples
•
Standard disc size
nominal 60mm
diameter
Discs have edge
passivation insulation
•
High peak pulse
current range
50000A to 70000A
Very high–energy
capability W
tm
880J to 10000J
•
•
Absolute Maximum Ratings
• For ratings of individual members of a series, see Device Ratings and Specifications chart
Continuous
Steady State Applied Voltage:
AC Voltage Range (V
M(AC)RMS
)
DC Voltage Range (V
M(DC)
)
Transient:
Peak Pulse Current (I
TM
)
For 8/20µs Current Wave(See Figure 2)
Single-Pulse Energy Range
For 2ms Current Square Wave (W
TM
)
Operating Ambient Temperature Range (T
A
)
Storage Temperature Range (T
STG
)
Temperature Coefficient (V) of Clamping Voltage (V
C
) at Specified Test Current
CA Series
250 to 2800
330 to 3500
Units
V
V
20,000 to 70,000
880 to 10,000
-55 to +85
- 55 to +85
<0.01
A
J
°C
°C
%/°C
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.
© 2017 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 09/14/17
High Energy Industrial Disc Varistors > CA Series
Metal-Oxide Varistors
(MOVs)
CA Series Ratings & Specifications
Maximum Rating (85°C)
Continuous
Part
Number
Device Branding
Size
V
RMS
V
M(AC)
(mm)
V251CA60
V271CA60
V321CA60
V421CA60
V481CA60
V511CA60
V571CA60
V661CA60
V751CA60
V881CA60
V112CA60
V142CA60
V172CA60
V202CA60
V242CA60
V282CA60
60
60
60
60
60
60
60
60
60
60
60
60
60
60
60
60
(V)
250
275
320
420
480
510
575
660
750
880
1100
1400
1700
2000
2400
2800
V
DC
Specifications (25°C)
Peak
Current
(8/20µs)
I
TM
(A)
50000
50000
50000
70000
70000
70000
70000
70000
70000
70000
70000
70000
70000
70000
70000
70000
Varistor Voltage at 1mA
DC Test Current
Min
(V)
351
387
459
612
675
738
819
945
1080
1350
1665
2070
2500
2970
3510
4230
V
NOM
(V)
390
430
510
680
750
820
910
1050
1200
1500
1850
2300
2700
3300
3900
4700
Max
(V)
429
473
561
748
825
902
1001
1155
1320
1650
2035
2530
3030
3630
4290
5170
Max Clamping
Volt Vc at 200A
Current
(8/20µs)
V
C
(A)
620
680
760
1060
1160
1300
1420
1640
1880
2340
2940
3600
4300
5200
6200
7400
Typical
Capacitance
f = 1MHz
(pF)
10000
9000
7500
6000
5500
5000
4500
4000
3500
2700
2200
1800
1500
1200
1000
800
Transient
Energy
(2ms)
W
TM
(J)
880
950
1100
1500
1600
1800
2100
2300
2600
3200
3800
5000
6000
7500
8800
10000
V
M(DC)
(V)
330
369
420
560
640
675
730
850
970
1150
1400
1750
2150
2500
3000
3500
NOTE: Average power dissipation of transients should not exceed 2.5W for CA60 discs.
Power Dissipation Ratings
Peak Pulse Current Test Waveform
90
80
70
60
50
40
30
20
10
0
-55
50
60
70
80
90
100 110 120 130 140 150
PERCENT OF PEAK VALUE
100
100
90
PERCENT OF RATED VALUE
50
10
O
1
T
T
1
TIME
T
2
Figure 1
AMBIENT TEMPERATURE (
o
C)
Figure 2
FIGURE 1. CURRENT,
rapid succession, the average
Should transients occur in
ENERGY AND POWER DERATING
power
CURVE
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 above. 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.
O
1
= Virtual Origin of Wave
T = Time From 10% to 90% of Peak
0 = Virtual Origin of Wave
T
1
1
= Virtual Front Time = 1.25 • t
T = Time from 10% to 90% of Peak
T
2
= Virtual Time to Half Value (Impulse Duration)
Example: For an 8/20 s Current Waveform:
T
2
= Decay Time
8 s = T
1
= Virtual Front Time
Example
- For an 8/20
µs
Current Waveform:
20 s = T
8µs
Virtual
Rise Time
Half Value
2
=
= T =
Time to
FIGURE 2. PEAK PULSE CURRENT TEST WAVEFORM
20µs = T
2
= Decay Time
1
T
1
= Rise Time = 1.25 x T
© 2017 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 09/14/17
MAXIMUM PEAK VOLTS (
2,000
SURGE CURRENT (A)
SURGE CURRENT (A)
2
2,000 10
1,000 10
3
500 10
4
200
900
1,000 10
3
800
700
500
10
4
600
V321CA40
500
V271CA40
200
V251CA40
400
V151CA40 100
50
300
10
6
SURGE CURRENT (A)
1,000
900
800
700
600 V321CA32 500 10
4
500 V271CA32
V251CA32 200
400
100
300 V151CA32
V131CA32 50
200
10
-3
10
-2
20
10,000
High Energy Industrial Disc
1052,000 102
> CA Series
105
Varistors
10
1,000
5,000
10
6
2
SURGE CURRENT (A)
10
Metal-Oxide Varistors
(MOVs)
20,000 1
10
5
6
MAXIMUM PEAK VOLTS (V)
3,000
T
A
= -55
o
C TO 85
o
C
20,000 1
2
10,000
V751CA32
10
5,000
V661CA32
V571CA32
2
V511CA32
2,000 10
V481CA32
1,000 10
3
V421CA32
DISC SIZE 32mm
V131CA32 - V321CA32
50,000
3,000
20,000 1 V751CA40
2
V511CA40
V661CA40
V481CA40
V571CA40
10,000 DISC SIZE 32mm
2,000 V421CA40
10
5,000 V131CA32 - V321CA32
DISC SIZE 32mm
V421CA32 - V751CA32
50,000
20,000
10,000
5,000
10
10
5
1
2
DISC SIZE 32mm
V421CA32 - V751C
2,000 10
2
1,000 10
3
500
200
10
4
10
6
100
100
V131CA40
20 INDEFINITE
200
INDEFINITE 10
1
50
5
10
10
-1
10
0
10
2
10
3
10
4
50
5
10
-1
10
0
10
1
10
2
10
3
10
4
10
10
-2
10
10
PEAK AMPERES
PEAK 100
AMPERES
20 INDEFINITE
20 INDEFINITE
20
100
1,000
10,000
20
1,000
10,000
IMPULSE DURATION ( µs)
IMPULSE DURATION ( µs)
FIGURE 3. CLAMPING VOLTAGE FOR V131CA32 - C751CA32
FIGURE 4. CLAMPING VOLTAGE FOR V131CA40 - V751CA40
10
10
V251CA60 - V881CA60
V251CA60 - V321CA60
FIGURE 7. SURGE CURRENT RATING CURVES FOR
FIGURE 8. SURGE CURRENT RATING CURVES FOR
20
100
1,000
10,000
20
100
1,000
IMPULSE DURATION ( µs)
V421CA32 - V751CA32
IMPULSE DURATION ( µs)
V131CA32 - V321CA32
Maximum Clamping Voltage for 60mm Parts
Repetitive Surge Capability for 60mm Parts
10
4
10
5
C751CA32
FIGURE 4. CLAMPING VOLTAGE FOR V131CA40 - V751CA40
FIGURE 9.
V112CA60 - V282CA60
100,000
50,000
30,000
20,000
MAX PEAK VOLTS (V)
MAX CLAMPING VOLTAGE
DISC SIZE 60mm
1100 TO 2800V
M(AC)
RATING
T
A
= -55
o
C TO 85
o
C
20,000
10,000
SURGE CURRENT (A)
5,000
2,000
1,000
500
200
100
50
20
10
20
10
0
10
1
10
2
PEAK AMPERES (A)
10
6
1
10
10
2
50,000
30,000
V131CA32 - V321CA32
V421CA32 - V751CA32
1
DISC SIZE 40mm
MAX CLAMPING VOLTAGE
DISC SIZE 60mm
o
C TO 85
o
C
T
A
=
V511CA60-55 V131CA40 - V751CA40
DISC20,00060mm
SIZE
V251CA60 - V321CA60
2
50,000 1
10
V481CA60
50,000
1100 TO 2800V
M(AC)
RATING
V421CA60
10,000 DISC SIZE 40mm
1
20,000
DISC SIZE 60mm
o
C TO 85
o
C
4
2
T
A
= -55
10
V131CA40 - V751CA40
V251CA60 - V321
20,000
20,000
2
5
2
10
10
10
5,000
10,000
10,000 10
10
4
2,000
10
3
5,000
10
5
2
10,000
10
2
5,000
10
9,000
1,000
10
4
V571CA60
8,000
2,000
2,000
10
3
1,000
500
10
3
500
7,000
900
10
5
1,000
1,000
1,000
6,000
800
10
4
900
V282CA60
700
800
V321CA60
200
5,000
V242CA60
200
500
500
600
700
V271CA60
10
5
6
500
V251CA60
600
V321CA40
100 10
6
4,000
V202CA60
100 10
200
200
500
V271CA40
50
400
V172CA60
50
V251CA40
3,000
V142CA60
100 10
6
100 10
6
400
300
INDEFINITE
INDEFINITE
V151CA40 20
V112CA60
20
50
50
300
10
10
200
2,000
INDEFINITE
100
1,000 20 INDEFINITE
10,000
-2
-1
20 10
0
1
2
3
4
5
V131CA40
10,000
10
10
10
10
10
10
10
10
-2
10
-1
20 10
0
10
1
100 10
2
10
3
1,000
10
4
10
20
5
200
IMPULSE DURATION ( µµ)
s
IMPULSE DURATION ( µs)
PEAK AMPERES (A)
-2
-1
0
PEAK AMPERES (A) 10
3
1
2
4
10 10
5
10
Figure 4
10
10
10
10
10
Figure 3
10
20
100
1,000
10,000
20
1,000
100
FIGURE 9. SURGE CURRENT RATING CURVES FOR
FIGURE 10. SURGE CURRENT RATING CURVES FOR
PEAK AMPERES
FIGURE 5. CLAMPING VOLTAGE FORV751CA40 - V881CA60
V251CA60
FIGURE 6. CLAMPING
(
VOLTAGE FOR V112CA60 - V282CA60
IMPULSE DURATION µµ)
s
IMPULSE DURATION ( µs)
V131CA40 -
MAXIMUM PEAK VOLTS
MAXIMUM PEAK VOLTS (V)(V)
SURGE CURRENT (A)
MAX PEAK VOLTS (V)
SURGE CURRENT (A)
SURGE CURRENT (A)
V251CA60 - V321CA60
SURGE CURRENT RATING CURVES FOR
V421CA60 - V282CA60
V131CA40 - V751CA40
SIZE 60mm
DISC
2
V421CA60 - V282CA60
100,000
1
50,000
20,000
10,000
SURGE CURRENT (A)
5,000
2,000
1,000
500
200
100
50
20
10,000
INDEFINITE
10
6
10
10
2
10
3
10
4
10
5
2
10
3
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
INDEFINITE
100
1,000
IMPULSE DURATION ( µs)
10
4
10
5
2,000
10
-2
10
-1
10
20
3
5
FIGURE
4
11. SURGE CURRENT RATING CURVES FOR
10
10
10
Figure 5
V421CA60 - V282CA60
Figure
V881CA60
FIGURE 6. CLAMPING VOLTAGE FOR V112CA60 - V282CA60
FIGURE 11. SURGE CURRENT RATING CURVES FOR
V421CA60 - V282CA60
6
100
1,000
IMPULSE DURATION ( µs)
SURGE CURRENT (A)
6,000
6,000
5,000
5,000
4,000
4,000
3,000
3,000
2,000
2,000
50,000 1
MAX CLAMPING VOLTAGE
MAXIMUM CLAMPING VOLTAGE
DISC 20,000 2
SIZE 60mm
DISC SIZE 40mm RATING
250 TO 880V
M(AC)
130 TO 750 V
M(AC)
RATING
10,000 10
T
A
= -55
o
C TO 85
o
C
5,000
10
2
V751CA40
V511CA40
V661CA40
V481CA40
V881CA60
2,000
V571CA40
10
3
V751CA60
V421CA40
V661CA60
1,000
FIGURE 7. SURGE CURRENT RATING CURVES FOR
FIGURE 8. SURGE CURRENT RATING CURVES FOR
FIGURE 10. SURGE CURRENT RATING CURVES FOR
V251CA60 - V321CA60
DISC SIZE 60mm
V421CA60 - V282CA60
10,000
NOTE: If pulse ratings are exceeded, a shift of V
N(DC)
(at specified current) of more than
+/-10% could result. This type of shift, which normally results in a decrease of V
N(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.
© 2017 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 09/14/17
High Energy Industrial Disc Varistors > CA Series
Metal-Oxide Varistors
(MOVs)
Physical Specifications
Soldering
Characteristics
Insulating Material
Device Labeling
Solderability per MIL–STD–202,
Method 208
glass passivation on edge only
none
Environmental Specifications
Operating/Storage
Temperature
Humidity Aging
-55°C to +85°C
+85°C, 85% RH, 1000 hours
+/-10% typical voltage change
+85°C to -55°C 10 times
+/-10% typical voltage change
MIL–STD–202, Method 215
Level 1, J–STD–020
Thermal Shock
Product Dimensions (mm)
OPTIONAL
PASSIVATION
COLLAR
Solvent Resistance
Moisture Sensitivity
ELECTRODE
2.5 mm
0.1 inch
Weight
ELECTRODE
Model Number
V251CA60
Typical Discweight
(Grams)
39
42
50
66
71
80
88
101
116
141
178
220
265
317
377
450
DIAMETER
(SEE TABLE)
THICKNESS
V271CA60
V321CA60
V421CA60
V481CA60
V511CA60
V571CA60
V661CA60
V751CA60
V881CA60
V112CA60
V142CA60
V172CA60
V202CA60
V242CA60
V282CA60
Model
Size
60
Disc Diameter
Millimeters
Min
58.0
Max
62.0
Min
2.283
Inches
Max
2.441
Model
V
RMS
V
M(AC)
250
275
320
420
510
575
660
750
880
1100
1400
1700
2000
2400
2800
Disc Thickness
Millmeters
Min.
2.0
2.2
2.6
3.5
4.2
4.6
5.3
6.1
7
.3
9.2
11.5
14.0
17
.0
20.0
24.0
Max.
2.7
3.0
3.5
4.7
5.7
6.3
7
.2
8.3
10.3
13.0
16.0
19.0
22.5
27
.0
32.0
Inches
Min.
0.079
0.087
0.102
0.138
0.165
0.181
0.209
0.240
0.287
0.362
0.453
0.551
0.669
0.787
0.945
Max.
0.106
0.118
0.138
0.185
0.224
0.248
0.283
0.327
0.406
0.512
0.630
0.748
0.886
1.063
1.260
© 2017 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 09/14/17
Metal-Oxide Varistors
(MOVs)
High Energy Industrial Disc Varistors > CA Series
Passivation Layer
The standard CA Series is supplied with passivation
layer around the outside perimeter of the disc forming
an electrical insulator as detailed in the dimensional
drawing. For other options contact factory. (See Ordering
Information)
Encapsulated Recommendations
Electrode Metallization
CA60 discs are supplied as standard with sintered Silver
electrodes. For other available options please contact
Littelfuse.
Recommended Reflow Temperature Profile
250
TYPICAL BEL OVEN TEMPERATURE PROFILE
T
TEMPERATURE (
o
C)
After lead attachment, the disc/lead assembly may be
coated or encapsulated in a package to provide electrical
insulation and isolation from environmental contamination
as required by the application. Coating/Filler materials for
containers may include silicones, polyurethanes, and some
epoxy resins. Materials containing halogens, sulfides, or
alkalines are not recommended.
Stacking and Contact Pressure Recommendations
When applications require the stacking of CA60 discs,
or when an electrical connection is made by pressure
contacts, the pressure applied to the CA60 disc electrode
surface should be minimum 2.2kgs (5 pounds) and
maximum
4N/CM
2
(5.7LBs/IN
2
).
Part Numbering System
200
150
100
50
0
0
100
200
300
400
500
600
700
800
900
TIME (SEC)
Packaging and Shipping
V 25 1 CA 60
VARISTOR DESIGNATOR
MAX AC
RMS
WORKING VOLTAGE
(FIRST SIGNIFICANT DIGITS) V
M(AC)
V
M(AC)
VOLTAGE DECADE MULTIPLIER
SERIES DESIGNATOR
DISC SIZE (mm) DIAMETER
The CA Series is supplied in bulk for shipment. Discs are
packaged in compartmentalized cartons to protect from
scratching or edge-chipping during shipment.
No branding or any other type of marking appears on the
CA disc itself.
CA60 discs are supplied as standard with sintered Silver
electrodes and glass passivation. For other available
options please contact factory.
Disclaimer Notice - Information furnished is believed to be accurate and reliable. However, users should independently evaluate the suitability of and
test each product selected for their own applications. Littelfuse products are not designed for, and may not be used in, all applications.
Read complete Disclaimer Notice at
www.littelfuse.com/disclaimer-electronics.
© 2017 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 09/14/17
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