Littelfuse DA-DB User Manual
Varistor Products
Industrial High Energy Terminal Varistors > DA/DB Series
DA/DB Varistor Series
DA SERIES
Agency Approvals
Agency Agency File Number
E320116
DB SERIES
RoHS
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 oildrilling, 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
W
up to 1050J
TM
• Wide operating
voltage range
V
M(AC)RMS
130V to 750V
• Screw terminals (DA
Series),quick connect
• Case design provides
complete electrical
isolation of disc
subassembly
• 40mm diameter disc
• No derating up to
85ºC ambient
• RoHS compliant
push-on connectors
(DB Series)
Absolute Maximum Ratings
• For ratings of individual members of a series, see Device Ratings and Specifications chart
Continuous DA/DB Series Units
Steady State Applied Voltage:
AC Voltage Range (V
DC Voltage Range (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 (W
Operating Ambient Temperature Range (T
Storage Temperature Range (T
Temperature Coefficient (a
Hi-Pot Encapsulation (COATING Isolation Voltage Capability)
(Dielectric must withstand indicated DC voltage for one minute per MIL-STD 202, Method 301)
COATING Insulation Resistance 1000 MΩ
) -55 to +125 ºC
STG
V
) of Clamping Voltage (VC) at Specified Test Current <0.01 %/ºC
) 130 to 750 V
M(AC)RMS
) 175 to 970 V
M(DC)
) 270 to 1050 J
) -55 to +85 ºC
A
TM
5000 V
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.
© 2013 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/da or /db.html for current information.
157
Revised: May 8, 2013
DA/DB Varistor Series
MOV’S
DA/DB Series
HI–ENERGY
Varistor Products
Industrial High Energy Terminal Varistors > DA/DB Series
DA/DB Series Ratings & Specifications
Maximum Rating (85ºC) Specifications (25ºC)
Continuous Transient
Part Number
Device Branding
V
V
RMS
M(AC)
V
V
M(DC)
Energy
DC
(2ms)
WTM I
Peak
Current
8 x 20μs
Min V
TM
Varistor Voltage at 1mA
DC Test Current
NOM
Max VC C
DA DB (V) (V) (J) (A) (V) (V) (V) (A) (pF)
V131DA40 V131DB40 130 175 270 40000
V151DA40 V151DB40 150 200 300 40000
1
184 200 228 345 10000
2
212 240 268 405 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 610 680 748 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
Note : Average power dissipation of transients not to exceed 2.0W.
Maximum
Clamping
Volt V
at
C
200A Current
(8/20μs)
tance f =
Typical
Capaci-
1MHz
Power Dissipation Ratings
100
90
80
70
60
50
40
30
PERCENT OF RATED VALUE
20
10
0
Figure 1
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.
-55 50 60 70 80 90 100 110 120 130 140 15
AMBIENT TEMPERATURE (oC)
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
Specifications table for the specific 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.
DA/DB Varistor Series
Peak Pulse Current Test Waveform
158
Revised: May 8, 2013
100
90
50
PERCENT OF PEAK VALUE
10
Figure 2
O
1
T
T
1
T
2
01 = Virtual Origin of Wave
T = Time from 10% to 90% of Peak
= Rise Time = 1.25 x T
T
1
T
= Decay Time
2
Example - For an 8/20 μs Current Waveform:
= Rise Time
8μs = T
1
20μs = T2 = Decay Time
Please refer to www.littelfuse.com/series/da or /db.html for current information.
Specifications are subject to change without notice.
TIME
© 2013 Littelfuse, Inc.
Loading...