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Industrial High Energy Terminal Varistors > DA/DB Series
DA/DB Varistor Series Description DA SERIES
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. DB SERIES
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
Agency Approvals
breakdown along the package surface design that provides complete electrical isolation of the disc subassembly. Agency File Number
See DA/DB Series Device Ratings and Specifications
table for part number and brand information. Features
Series),quick connect push-on connectors
V’S eries Absolute Maximum Ratings
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Continuous DA/DB Series HI–ENERGY MO
For 8/20μs Current Wave (See Figure 2)
Single Pulse Energy RangeFor 2ms Current Squarewave (W )
Temperature Coefficient (aV) of Clamping Voltage (V ) at Specified Test Current
Hi-Pot Encapsulation (COATING Isolation Voltage Capability)
(Dielectric must withstand indicated DC voltage for one minute per MIL-STD 202, Method 301)
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.DA/DB Varistor Series
Specifications are subject to change without notice. Please refer to www.littelfuse.com/series/da or /db.html for current information. Varistor Products
Industrial High Energy Terminal Varistors > DA/DB Series
DA/DB Series Ratings & Specifications
Note : Average power dissipation of transients not to exceed 2.0W. Power Dissipation Ratings Peak Pulse Current Test Waveform PERCENT OF PEAK V PERCENT OF R AMBIENT TEMPERATURE ( oC)
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.
T = Time from 10% to 90% of PeakT = Rise Time = 1.25 x T
Should transients occur in rapid succession, the
average power dissipation required is simply the energy
Example - For an 8/20 μs Current Waveform:
(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
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/da or /db.html for current information. Varistor Products
Industrial High Energy Terminal Varistors > DA/DB Series
Maximum Clamping Voltage Repetitive Surge Capability V131DA40 - V751DA40 and V131DB40 - V751DB40 V131DA40 - V751DA40 and V131DB40 - V751DB40
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. Physical Specifications Environmental Specifications Operating/Storage Lead Material Temperature Insulating Material meets UL94V–0 requirements. Humidity Aging Device Labeling Thermal Shock Solvent Resistance Moisture Sensitivity V’S eries HI–ENERGY MO DA/DB Varistor Series
Specifications are subject to change without notice. Please refer to www.littelfuse.com/series/da or /db.html for current information. Varistor Products
Industrial High Energy Terminal Varistors > DA/DB Series
Product Dimensions (mm) DA SERIES DB SERIES “A” DIMENSION: ALL DIMENSIONS ARE MAXIMUM FILISTER HEAD SCREW - 51mm (2.01) EXCEPT WHERE NOTED PAN HEAD SCREW - 53mm (2.09) 44.45 0.75 (1.75 0.03) 15mm (0.59) 25.4 0.75 (1.00 0.03) M4 INTERNATIONAL (0.90 0.04) HOLES 0.23 THRU BORE 0.370 x 0.370 DP 4.5mm (0.18)
Dimensions in millimeters and (inches). Part Numbering System V XX X DA 40 VARISTOR DISC SIZE (60mm) SERIES DESIGNATOR
*Refer to Rating & Specifications table Example: 130 VM(AC) = 131 DA/DB Varistor Series
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/da or /db.html for current information.
June 2009 101 School Street Trevor P. Hovde, Principal Lodi, WI 53555 592-3842 A note from the principal beginning at 1:00 PM. After that date placements will be posted on the wall outside of the elementary office. I’m sure this past week with the unexpected closing of Registration materials will be mailed out around August school due to the H1N1 flu (Swine flu) caught us all a littl
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