Varistor Products
©2011 Littelfuse, Inc.
Revision: September 25, 2011
DA/DB Varistor Series
Industrial High Energy Terminal Varistors > DA/DB Series
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/da or /db.html for current information.
HI–ENERGY MOV’S DA/DB Series
DA/DB Varistor Series
Description
The DA and DB Series transient surge suppressors
are heavy-duty industrial Metal-Oxide Varistors
(MOVs) designed to provide surge protection for
motor controls and power supplies used in oil-
drilling, mining, and transportation equipment.
These UL recognized varistors have identical ratings
and specifications but differ in case construction
to provide flexibility in equipment designs.
DA Series devices feature rigid terminals to ensure
secure wire contacts. Both the DA and DB Series feature
improved creep and strike distance capability to minimize
breakdown along the package surface design that provides
complete electrical isolation of the disc subassembly.
See DA/DB Series Device Ratings and Specifications
table for part number and brand information.
Features
• Highenergy
absorption capability
WTM up to 1050J
• Wideoperating
voltage range
VM(AC)RMS 130V to 750V
• Screwterminals(DA
Series),quick connect
push-on connectors
(DB Series)
• Casedesignprovides
complete electrical
isolation of disc
subassembly
• 40mmdiameterdisc
• Noderatingupto
85ºC ambient
• RoHScompliant
Agency Approvals
Absolute Maximum Ratings
•Forratingsofindividualmembersofaseries,seeDeviceRatingsandSpecicationschart
Agency Agency File Number
E320116
CAUTION: Stresses above those listed in "Absolute Maximum Ratings" may cause permanent damage to the device. This
is a stress only rating and operation of the device at these or any other conditions above those indicated in the operational
sections of this specification is not implied.
Continuous DA/DB Series Units
Steady State Applied Voltage:
AC Voltage Range (VM(AC)RMS) 130 to 750 V
DC Voltage Range (VM(DC)) 175 to 970 V
Transients:
Peak Pulse Current (ITM)
For8/20µsCurrentWave(SeeFigure2) 40,000 A
Single Pulse Energy Range
For2msCurrentSquarewave(WTM) 270 to 1050 J
Operating Ambient Temperature Range (TA) -55 to +85 ºC
Storage Temperature Range (TSTG) -55 to +125 ºC
Temperature Coefficient (aV) of Clamping Voltage (VC) at Specified Test Current <0.01 %/ºC
Hi-PotEncapsulation(COATINGIsolationVoltageCapability)
(Dielectric must withstand indicated DC voltage for one minute per MIL-STD 202, Method 301) 5000 V
COATINGInsulationResistance 1000 MΩ
RoHS
DA SERIES
DB SERIES
Varistor Products
©2011 Littelfuse, Inc.
Revision: September 25, 2011
DA/DB Varistor Series
Industrial High Energy Terminal Varistors > DA/DB Series
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/da or /db.html for current information.
Note:Averagepowerdissipationoftransientsnottoexceed2.0W.
DA/DB Series Ratings & Specifications
Part Number
Device Branding
Maximum Rating (85ºC) Specifications (25ºC)
Continuous Transient
Varistor Voltage at 1mA
DC Test Current
Maximum
Clamping
Volt VC at
200A Current
(8/20µs)
Typical
Capaci-
tance f =
1MHz
VRMS VDC
Energy
(2ms)
Peak
Current
8 x 20µs
VM(AC) VM(DC) WTM ITM Min VNOM Max VC C
DA DB (V) (V) (J) (A) (V) (V) (V) (A) (pF)
V131DA40 V131DB40 130 175 270 400001184 200 228 345 10000
V151DA40 V151DB40 150 200 300 400002212 240 268 405 8000
V251DA40 V251DB40 250 330 370 40000 354 390 429 650 5000
V271DA40 V271DB40 275 369 400 40000 389 430 473 730 4500
V321DA40 V321DB40 320 420 460 40000 462 510 561 830 3800
V421DA40 V421DB40 420 560 600 40000 610 680 74 8 1130 3000
V481DA40 V481DB40 480 640 650 40000 670 750 825 1240 2700
V511DA40 V511DB40 510 675 700 40000 735 820 910 1350 2500
V571DA40 V571DB40 575 730 770 40000 805 910 1000 1480 2200
V661DA40 V661DB40 660 850 900 40000 940 1050 1160 1720 2000
V751DA40 V751DB40 750 970 1050 40000 1080 1200 1320 2000 1800
Should transients occur in rapid succession, the
average power dissipation 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
Specicationstableforthespecicdevice.Furthermore,
the operating values need to be derated at high
temperatures as shown above. Because varistors can only
dissipate a relatively small amount of average power they
are, therefore, not suitable for repetitive applications that
involve substantial amounts of average power dissipation.
Power Dissipation Ratings
FIGURE 1. CURRENT, ENERGY AND POWER DERATING
CURVE
100
90
80
70
60
50
40
30
20
10
0
-55 50 60 70 80 90 100110 120130 140150
PERCENT OF RATED VALUE
AMBIENT TEMPERATURE (
o
C)
FIGURE 2. PEAK PULSE CURRENT TEST WAVEFORM
100
90
50
10
O
1
T
T
1
T
2
TIME
PERCENT OF PEAK VALUE
O
1
= Virtual Origin of Wave
T = Time From 10% to 90% of Peak
T
1
= Virtual Front time = 1.25 • t
T
2
= Virtual Time to Half Value (Impulse Duration)
Example: For an 8/20 s Current Waveform:
8s = T
1
= Virtual Front Time
20 s = T
2
= Virtual Time to Half Value
Peak Pulse Current Test Waveform
01 = Virtual Origin of Wave
T = Time from 10% to 90% of Peak
T1 = Rise Time = 1.25 x T
T2 = Decay Time
Example -Foran8/20µsCurrentWaveform:
8µs = T1 = Rise Time
20µs = T2 = Decay Time
NOTES:
1. Peak current Applies to applications rated up to 115VRMS. Peak
current is 30kA for applications greater than 115V.
2. Peak current applies to applications rated up to 132VRMS. Peak
Current is 30kA for applications greater than 132V.
Figure 1 Figure 2
Varistor Products
©2011 Littelfuse, Inc.
Revision: September 25, 2011
DA/DB Varistor Series
Industrial High Energy Terminal Varistors > DA/DB Series
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/da or /db.html for current information.
HI–ENERGY MOV’S DA/DB Series
Repetitive Surge Capability
Maximum Clamping Voltage
V131DA40 - V751DA40 and V131DB40 - V751DB40
FIGURE 3. CLAMPING VOLTAGE FOR V131DA40, V131DB40 - V751DA40, V751DB40
200
6,000
5,000
4,000
3,000
1,000
900
800
700
600
500
400
300
10
-2
10
-1
10
0
10
1
10
2
10
3
10
4
10
5
MAXIMUM CLAMPING VOLTAGE
DISC SIZE 40mm
130 TO 750 VM(AC) RATING
T
A
= -55
o
C to 85
o
C
V421DA/DB40
V151DA/DB40
V751DA/DB40
MAXIMUM PEAK VOLTS (V)
PEAK AMPERES (A)
V131DA/DB40
V321DA/DB40
V271DA/DB40
V251DA/DB40
V511DA/DB40
V481DA/DB40
V571DA/DB40
V661DA/DB40
2,000
Operating/Storage
Temperature
-55°C to +85°C/ -55°C to
+125°C
Humidity Aging
+85°C,85%RH,1000hours
+/- 5% typical resistance
change
Thermal Shock
+85°Cto-40°C10times
+/- 5% typical resistance
change
Solvent Resistance MIL–STD–202,Method215F
Moisture Sensitivity Level 1, J–STD–020C
Lead Material DA - Copper, Tin–plated
DB - Brass, Tin–plated
Insulating Material Cured, flame retardant epoxy polymer
meetsUL94V–0requirements.
Device Labeling MarkedwithLF,partnumberanddate
code
Physical Specifications Environmental Specifications
NOTE:Ifpulseratingsareexceeded,ashiftofVN(DC) (at specified current) of more than
+/-10% could result. This type of shift, which normally results in a decrease of VN(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.
V131DA40 - V751DA40 and V131DB40 - V751DB40
Figure 3 Figure 4
FIGURE 5. SURGE CURRENT RATING CURVES FOR
V131DA40, V131DB40 - V751DA40, V751DB40
DISC SIZE 40mm
V131DA40 - V751DA40
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)
V131DB40 - V751DB40
2
1
INDEFINITE
10
4
10
3
10
2
10
5
10
6
10
Varistor Products
©2011 Littelfuse, Inc.
Revision: September 25, 2011
DA/DB Varistor Series
Industrial High Energy Terminal Varistors > DA/DB Series
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/da or /db.html for current information.
Product Dimensions (mm)
DA SERIES
Dimensions in millimeters and (inches).
A
4.3mm
(0.170) 15mm (0.59)
“A” DIMENSION:
FILISTER HEAD SCREW - 51mm (2.01)
PAN HEAD SCREW - 53mm (2.09)
23mm 1mm
(0.90 0.04)
57mm
(2.24)
67mm
(2.64)
62mm
(2.44)
M4 INTERNATIONAL
THREAD
4.5mm (0.18)
DB SERIES
60.3
(2.37)
44.45 0.75
(1.75 0.03)
46.8
(1.84)
25.4 0.75
(1.00 0.03)
ALL DIMENSIONS ARE MAXIMUM
EXCEPT WHERE NOTED
HOLES 0.23 THRU
BORE 0.370 x 0.370 DP
12.7
(0.50)
6.60
(0.26)
2 HOLES
6.60
(0.26)
41
(1.61)
40.5
(1.6)
1. 6
(0.06)
23
(0.90)
12.7
(0.50)
Part Numbering System
VARISTOR
VM(AC)
First Two Significant Digits*
VM(AC)
VM(AC)
VM(AC)
Decade Multiplier*
*Refer to Rating & Specifications table
Example:
130 VM(AC) = 131
DISC SIZE (60mm)
SERIES DESIGNATOR
DA or DB
V XX XDA40