Varistor products, Hi–energy mo v’s, Ha series – Littelfuse HA Varistor Series User Manual
Page 3: Power dissipation ratings, Maximum clamping voltage for 32mm parts, Current , energy and power de–rating curve 0, Rise time = 1.25 x t t, Rise time 20 μ s = t, Decay time, Figure 1 figure 2 figure 3 figure 4
© 2013 Littelfuse, Inc.
163
Revised: May 8, 2013
Varistor Products
HA Varistor Series
Industrial High Energy Terminal Varistors > HA Series
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/ha.html for current information.
HI–ENERGY
MO
V’S
HA Series
Should transients occur in rapid succession, the average power
dissipation required is simply 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 for 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
PERCENT OF R
A
TED
V
ALUE
AMBIENT TEMPERATURE (
o
C)
100
90
50
10
O
1
T
T
1
T
2
TIME
PERCENT OF PEAK V
ALUE
Peak Pulse Current Test Waveform
Maximum Clamping Voltage for 40mm Parts
V111HA40–V751HA40
Maximum Clamping Voltage for 32mm Parts
V111HA32–V751HA32
100
1000
10000
0.001
0.01
0.1
1
10
100
1000
10000
100000
Current (A)
Vo
lt
age (V
)
TA = -55 C to 85C
V681CA32
V751CA32
V481CA32
V441CA32
V421CA32
V391CA32
V571CA32
V661HA32
V551CA32
V511CA32
V301CA32
V331CA32
V321CA32
V351CA32
V271CA32
V251CA32
V201CA32
V181CA32
V151CA32
V141CA32
V131CA32
C111CA32
Maximum Clamping Voltage
HA32 Series
110 to 750V AC Rating
Current , Energy and Power De–Rating Curve
0
1
= Virtual Origin of Wave
T = Time from 10% to 90% of Peak
T
1
= Rise Time = 1.25 x T
T
2
= Decay Time
Example - For an 8/20 μs Current Waveform:
8μs = T
1
= Rise Time
20μs = T
2
= Decay Time
100
1000
10000
0.001
0.01
0.1
1
10
100
1000
10000
100000
Maximum Clamping Voltage
HA40 Series
110 to 750V AC Rating
TA = -55 C to 85C
Current - (A)
V
oltage
(V)
V751
V571
V551
V511
V481
V441
V421
V391
V351
V111
V131
V141
V151
V681
V331
V321
V301
V271
V251
V201
V181
V661
Figure 1
Figure 2
Figure 3
Figure 4