Metal-OxideVaristors (MOVs)
Radial Lead Varistors > ZA Series
Phenolic Coating Option -- ZA SeriesVaristors for Hi-
Temperature Operating Conditions:
Copper Electrode Option:
•
•
•
Add 'W' to the end of the part
number (e.g. V240ZA05PW)
•
•
•
Phenolic coated ZA Series devices are available with
improved maximum operating temperature of 125°C
Copper electrode option is only available
for V240~V750 for ZA series.
These devices also have improved temperature
cycling performance capability
Product marking:
LF 9
PZ240W
Ratings and specifications are as per standard
ZA Series except Hi–Pot Encapsulation
(Isolation Voltage Capability) = 500V
YYWW
Lead-Free,
Halogen-Free
& RoHS Compliant
Indicator
Copper Electrode
Option
Identifier
•
To order: add 'X1347' to part number
(e.g. V22ZA3PX1347)
•
•
•
These devices are not UL, VDE or CECC certified
Contact factory for further details
LF 9
P22P3
YYWW
Product marking:
Lead-Free,
Halogen-Free
& RoHS Compliant
Indicator
Phenolic Coated
Option
Identifier
Current Energy and Power Dissipation Ratings
device. The operating values of a MOV need to be derated
at high temperatures as shown above. 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.
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 SpecificationsTable for the specific
Figure 1A - Power Derating for Epoxy Coated
Figure 1B - Power Derating for Phenolic Coated
100
90
80
70
60
50
40
30
20
10
0
100
90
80
70
60
50
40
30
20
10
0
-55 50
60
70
80
90 100 110 120 130 140 150
o
-55
50
60
70
80
90 100 110 120 130 140 150
o
AMBIENTTEMPERATURE ( C)
AMBIENTTEMPERATURE ( C)
Peak Pulse CurrentTestWaveform
100
90
01 = Virtual Origin of Wave
T =Time from 10% to 90% of Peak
T1 = RiseTime = 1.25 xT
T2 = DecayTime
50
Example - For an 8/20 µs Current Waveform:
8µs =T1 = RiseTime
20µs =T2 = DecayTime
10
O
T
TIME
1
T
1
Figure 2
T
2
© 2018 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 12/12/18