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V130LA20CPX325

Radial Lead Varistors (C-III Varistor Series)

Littelfuse, Inc 

Varistor Products

Radial Lead Varistors > C-III series

AC Bias Reliability

The C-III Series MOVs were designed for use on the AC

line. The varistor is connected across the AC line and is

biased with a constant amplitude sinusoidal voltage. It

should be noted that the definition of failure is a shift in the

nominal varistor voltage (V/
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this type of varistor is still functioning normally after this

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statistically designed tests were performed to determine

the reliability of the C-III type of varistor under AC bias

combined with high levels of temperature stress. To

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the diagram at right.

High Temperature Operating Life 125ºC for 1000 Hours

at Rated Bias

300

V130LA20C

250

200

150

100

0 100 200 300 400 500 600 700 800 900 1000 1100

Figure 12

TIME (HOURS)

Transient Surge Current/Energy Transient Capability

The transient surge rating serves as an excellent figure

of merit for the C-III varistor. This inherent surge handling

capability is one of the C-III varistor’s best features.

The enhanced surge absorption capability results from

improved process uniformity and enhanced construction.

The homogeneity of the raw material powder and

improved control over the sintering and assembly

processes are contributing factors to this improvement.

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worst case surge occurrence will be 3kA. Such a transient

event may occur up to five times over the equipment life

time (approximately 10 years). While the occurences of

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repetitive surge current for the C-III Series is 20 pulses

for the 20mm units and 10 pulses for the 14mm Series.

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a worst case repetitive transient surges test. After 20

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the device characteristics. Changes in the clamping

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negligible changes in any of the device characteristics

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In both cases the inherent device capability is far

in excess of the expected worst case scenario.

Typical Repetitive Surge Current Capability of

C-III Series MOVs

500

V130LA20C

3kA (8/20μs)

450

400

350

(RATED FOR 20 PULSES)

300

0

Figure 13

5

10

15

20

25

30

NUMBER OF SURGES

600

V175LA20C

550

750A (8/20μs)

500

450

400

350

(RATED FOR 120 PULSES)

300

0

50

100

150

200

250

300

NUMBER OF SURGES

Figure 14

©2010 Littelfuse, Inc.

Specifications are subject to change without notice.

Please refer to www.littelfuse.com/series/c-iii.html for current information.

Revision: September 9, 2010

C-III Varistor Series

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