V251HB34 Littelfuse Inc, V251HB34 Datasheet - Page 5

• Manufacturer Part Number: V251HB34
• Description: VARISTOR SQUARE INDUST 250V HB34
• Manufacturer: Littelfuse Inc
• Series: HB34r

Specifications of V251HB34

• Varistor Voltage: 390V
• Current-surge: 40kA
• Number Of Circuits: 1
• Maximum Ac Volts: 250VAC
• Maximum Dc Volts: 330VDC
• Energy: 370J
• Package / Case: 34mm Square
• Product: MOV
• Voltage Rating Dc: 330 V
• Voltage Rating Ac: 250 V
• Clamping Voltage: 650 V
• Peak Surge Current: 40 KA
• Capacitance: 5000 pF
• Operating Temperature Range: - 55 C to + 85 C
• Mounting: Radial
• Dimensions: 34 mm Dia.
• Termination Style: Solder Terminal
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Contains lead / RoHS non-compliant

©2011 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/hb34.html or /hf34 or /hg34.thml
for current information.
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
Specifications Table for the specific device. The operating
values must be derated as shown in above.
Clamping Voltage for HB34, HF34 and HG34 Series
V421
V441
Figure 3
V481
Voltage -
VOLTS
Figure 1
10000
1000
100
1mA
Maximum Clamping Voltage
HB34, HF34, and HG34 series
V511
10mA
Current - AMPS
V551
100mA
V571
1A
V391
V351 V331 V321
10A
V661
V681
100A
V301
TA = -55 C to 85C
V271
V751
Varistor Products
Industrial High Energy Terninal Varistors > HB34, HF34 & HG34 Series
1000A
V251 V201 V181
V141
10000A
V151
V131
V111
100000A
Revision: February 21, 2011
+/-10% could result. This type of shift, which normally results in a decrease of V
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.
Peak Pulse Current Test Waveform
Surge Current Rating Curves for HB34, HF34 and HG34 Series
Figure 4
Figure 2
50,000
20,000
10,000
5,000
2,000
1,000
0
T
T
Example - For an 8/20 μ
500
200
100
1
1
2
50
20
10
= Rise Time = 1.25 x T
O
20
100
1
8μs = T
20μs = T
10
10
10
10
90
50
10
INDEFINITE
2
2
3
4
1
1
2
= Rise Time
100
T
T
IMPULSE DURATION (μs)
1
T
2
10
5
(at specified current) of more than
HB34, HF34 and HG34 Varistor Series
10
1,000
6
TIME
Hx34
10,000
, may