Varistor Products

©2010 Littelfuse, Inc.

Revision: August 4, 2010

LA Varistor Series

Radial Lead Varistors > LA Series

Specifications are subject to change without notice.

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

Should transients occur in rapid succession, the average

power dissipation 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.The operating values of a MOV need to be derated

at high temperatures as shown in the diagram below.

Because varistors only dissipate a relatively small amount

of average power they are not suitable for repetitive

applications that involve substantial amounts of average

power dissipation.

Power Dissipation Ratings

100

90

80

70

60

50

40

30

20

10

0

-55

50

60

70

80

90 100 110 120 130 140 150

Peak Pulse Current Test Waveform

Current Energy and Power Derating Curve

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

50

10

T

TIME

Figure 1

Figure 2