Industrial High Energy Terminal Varistors > DA/DB Series
DA/DB Varistor Series
DA SERIES
Agency Approvals
AgencyAgency 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
ContinuousDA/DB SeriesUnits
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)40,000A
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 Resistance1000MΩ
)-55 to +125ºC
STG
V
) of Clamping Voltage (VC) at Specified Test Current<0.01%/ºC
)130 to 750V
M(AC)RMS
)175 to 970V
M(DC)
)270 to 1050J
)-55 to +85ºC
A
TM
5000V
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.
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.
Industrial High Energy Terminal Varistors > DA/DB Series
Maximum Clamping Voltage
V131DA40 - V751DA40 and V131DB40 - V751DB40
6,000
MAXIMUM CLAMPING VOLTAGE
5,000
DISC SIZE 40mm
4,000
130 TO 750 VM(AC) RATING
3,000
V511DA/DB40
V481DA/DB40
2,000
V421DA/DB40
1,000
900
800
700
600
500
MAXIMUM PEAK VOLTS (V)
400
V151DA/DB40
300
V131DA/DB40
200
-210-1
10
Figure 3
NOTE: If pulse ratings are exceeded, a shift of V
+/-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.