Varistor Products

©2010 Littelfuse, Inc.

Revision: July 11, 2010

HB34, HF34 and HG34 Varistor Series

Industrial High Energy Terninal Varistors > HB34, HF34 & HG34 Series

Specifications are subject to change without notice.

Please refer to www.littelfuse.com/series/hb34.html or /hf34 or /hg34.thml

for current information.

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

Specifications Table for the specific device. The operating

values must be derated as shown in above.

Power Dissipation Ratings

100

90

50

10

T

TIME

Peak Pulse Current Test Waveform

Clamping Voltage for HB34, HF34 and HG34 Series

1000

10000

1mA

10mA

100mA

1A

10A

100A 

10000A

100000A

Maximum Clamping Voltage

HB34, HF34, and HG34 series

TA = -55 C to 85C

Current - AMPS

Voltage -

VOLTS

V751

V681

V661

V571

V551

V511

V391

V351 V331 V321

V271

V251 V201 V181

V151

V141

V111

V131

V301

V481

V441

V421

100

1000A

Surge Current Rating Curves for HB34, HF34 and HG34 Series

Hx34

50,000

20,000

10,000

5,000

2,000

1,000

500

200

100

50

20

10

20

100

1,000

10,000

IMPULSE DURATION (μs)

10

1

INDEFINITE

2

(at specified current) of more than

+/-10% could result. This type of shift, which normally results in a decrease of V

, 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

T

T

2

Example - For an 8/20 μ

8μs = T

20μs = T

2

Figure 1

Figure 2

Figure 3

Figure 4