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V111HA32 Datasheet(PDF) 4 Page - Littelfuse

Part No. V111HA32
Description  Varistor Products - High Energy Industrial
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Manufacturer  LITTELFUSE [Littelfuse]
Direct Link  http://www.littelfuse.com
Logo LITTELFUSE - Littelfuse

V111HA32 Datasheet(HTML) 4 Page - Littelfuse

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100
1000
10000
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)
V751
V571
V551
V511
V481
V441
V421
V391
V351
V111
V131
V141
V151
V681
V331
V321
V301
V271
V251
V201
V181
V661
93
www .littelfuse .com
Varistor Products
2
HA Varistor Series
High Energy Industrial
Power Dissipation Ratings
Should transients occur in rapid succession, the average power dissipa-
tion 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 Figure 1. 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.
Transient V-I Characteristics Curves
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 ( oC)
FIGURE 1. CURRENT, ENERGY AND POWER DERATING
CURVE
FIGURE 2. PEAK PULSE CURRENT WAVEFORM
100
90
50
10
O1
T
T1
T2
TIME
O1 = Virtual Origin of Wave
T = Time From 10% to 90% of Peak
T1 = Virtual Front Time = 1.25 • t
T2 = Virtual Time to Half Value (Impulse Duration)
Example: For an 8/20µs Current Waveform:
8µs = T1 = Virtual Front Time
20µs = T2 = Virtual Time to Half Value
100
1000
10000
0.001
0.01
0.1
1
10
100
1000
10000
100000
Current (A)
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
FIGURE 3. MAXIMUM CLAMPING VOLTAGE (V111HA32 - V751HA32)
FIGURE 4. MAXIMUM CLAMPING VOLTAGE (V111HA40 - V751HA40)
Current (A)


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