Littelfuse DHB34 Varistor Series - Manual (Page 3)

© 2013 Littelfuse, Inc. 177
Revised: May 8, 2013
Varistor Products
DHB34 Varistor Series
Industrial High Energy Terminal Varistors > DHB34 Series
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/dhb34.html for current information.
HI–ENERGY
MO
V’S
DHB34 Series
Should transients occur in rapid succession, the average
power 100 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 above.
Power Dissipation Ratings
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
DISC SIZE 34mm
V131DHB34 - V751DHB34
50,000
20,000
10,000
5,000
2,000
1,000
500
200
100
50
20
10
20 100 1,000 10,000
SURGE CURRENT (A)
IMPULSE DURATION ( μs)
10
1
INDEFINITE
105 102
2
103
104
106
Repetitive Surge Capability
NOTE: If pulse ratings are exceeded, a shift of V
N(DC)
(at specified current) of more than
+/-10% could result. This type of shift, which normally results in a decrease of V
N(DC)
, may
result in the device not meeting the original published specifications, but it does not
prevent the device from continuing to function, and to provide ample protection.
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
1000
10000
0.001 0.01 0.1 1 10 100 10000 100000
Maximum Clamping Voltage
DHB34 Series
110 to 750V AC Rating TA = -55 C to 85C
Current - AMPS
V751
V681 V661
V571
V551
V511
V391 V351 V331 V321 V271 V251 V201 V181
V151
V141
V111
V131
V301
V481
V441
V421
100
1000
Voltage -
VOLTS
Figure 1 Figure 2
Figure 3 Figure 4