V131HB34 Datasheet, PDF (3/4 Pages) Littelfuse – Varistor Products - High Energy Industrial

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HB34 Varistor Series
Power Dissipation Ratings
Should transients occur in rapid succession, the average power
dissipation result 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.
Varistor Products
High Energy Industrial
2
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
FIGURE 2. PEAK PULSE CURRENT TEST WAVEFORM
Transient V-I Characteristics Curves
10000
MAXIMUM CLAMPINGVOLTAGE
VARISTOR SIZE 34mm
130 TO 750 V_M(AC) RATING
V511HB34
V481HB34
V421HB34
1000
V751HB34
V661HB34
V571HB34
T_A = -55^oC TO 85^oC
100
-5
V131HB34
-4
1E-3
0.01
V321HB34
V271HB34
V251HB34
V151HB34
0.1
1
10
100
CURRENT (A)
1,000
10,000
100,000
FIGURE 3. CLAMPING VOLTAGE FOR V131HB34 - V751HB34
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