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Varistor Products
High Energy Industrial Square Disc
NA Varistor Series
Power Dissipation Ratings
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. The operating values must be derated as
shown in Figure 1.
100
90
80
70
60
50
40
30
20
10
0
-55
50
60
70
80
90
100 110 120 130 140 150
AMBIENT TEMPERATURE ( o C)
FIGURE 1. CURRENT, ENERGY AND POWER DERATING
100
90
50
CURVE
O 1 = Virtual Origin of Wave
T = Time From 10% to 90% of Peak
T 1 = Virtual Front time = 1.25 ? t
T 2 = Virtual Time to Half Value (Impulse Duration)
Example: For an 8/20 μ s Current Waveform:
8 μ s = T 1 = Virtual Front Time
20 μ s = T 2 = Virtual Time to Half Value
10
O 1
T
TIME
T 1
T 2
FIGURE 2. PEAK PULSE CURRENT TEST WAVEFORM
Transient V-I Characteristics Curves
10000
MAXIMUM CLAMPING VOLTAGE
VARISTOR SIZE 34mm
130 TO 750 V M(AC) RATING
V511NA34
V481NA34
V421NA34
V751NA34
V661NA34
V571NA34
T A = -55 o C TO 85 o C
1000
V321NA34
100
V131NA34
V271NA34
V251NA34
V151NA34
-5
-4
1E-3
0.01
0.1
1
10
100
1,000
10,000
100,000
CURRENT (A)
FIGURE 3. CLAMPING VOLTAGE FOR V131NA34 - V751NA34
124
w w w. l i t t e l f u s e . c o m
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