© 2013 Littelfuse, Inc.

182

Revised: May 8, 2013

Varistor Products

CA Varistor Series

High Energy Industrial Disc Varistors > CA Series

Specifications are subject to change without notice.

Please refer to www.littelfuse.com/series/ca.html for current information.

CA Series Ratings & Specifications

Part

Number

Device Branding

Size

Maximum Rating (85°C)

Specifications (25°C)

Continuous

Transient

Varistor Voltage at 1mA

DC Test Current

Max Clamping

Volt Vc at 200A

Current

(8/20μs)

Typical

Capacitance

V

RMS

V

DC

Energy

(2ms)

Peak

Current

(8/20μs)

V

M(AC)

V

M(DC)

W

TM

I

TM

Min

V

NOM

Max

V

C

f = 1MHz

(mm)

(V)

(V)

(J)

(A)

(V)

(V)

(V)

(A)

(pF)

V251CA60

60

250

330

880

50000

354

390

429

620

10000

V271CA60

60

275

369

950

50000

389

430

473

680

9000

V321CA60

60

320

420

1100

50000

462

510

561

760

7500

V421CA60

60

420

560

1500

70000

610

680

748

1060

6000

V481CA60

60

480

640

1600

70000

670

750

825

1160

5500

V511CA60

60

510

675

1800

70000

735

820

910

1300

5000

V571CA60

60

575

730

2100

70000

805

910

1000

1420

4500

V661CA60

60

660

850

2300

70000

940

1050

1160

1640

4000

V751CA60

60

750

970

2600

70000

1080

1200

1320

1880

3500

V881CA60

60

880

1150

3200

70000

1290

1500

1650

2340

2700

V112CA60

V142CA60

V172CA60

V202CA60

V242CA60

V282CA60

60

60

60

60

60

60

1100

1400

1700

2000

2400

2800

1400

1750

2150

2500

3000

3500

3800

5000

6000

7500

8800

10000

70000

70000

70000

70000

70000

70000

1620

2020

2500

2970

3510

4230

1800

2200

2700

3300

3900

4700

2060

2550

3030

3630

4290

5170

2940

3600

4300

5200

6200

7400

2200

1800

1500

1200

1000

800

NOTE: Average power dissipation of transients should not exceed 2.5W for CA60 discs.

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 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.

Power Dissipation Ratings

100

90

50

10

T

TIME

Peak Pulse Current Test Waveform

0

T = Time from 10% to 90% of Peak

T

T

Example - For an 8/20 μs Current Waveform:

8μs = T

20μs = T

100

90

80

70

60

50

40

30

20

10

0

-55

50

60

70

80

90

100

110

120

130

140

150

Figure 1

Figure 2