Varistor Products High Energy Industrial DA/DB Varistor Series ® The DA and DB Series transient surge suppressors are heavy-duty industrial metal-oxide varistors 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 insure 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. DA SERIES 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 AGENCY APPROVALS: Recognized under the components program of Underwriters Laboratories. AGENCY FILE NUMBERS: UL E75961. 86 w w w. l i t t e l f u s e . c o m DB SERIES Varistor Products High Energy Industrial DA/DB Varistor Series For ratings of individual members of a series, see Device Ratings and Specifications chart Continuous: DA/DB SERIES Steady State Applied Voltage: AC Voltage Range (VM(AC)RMS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130 to 750 DC Voltage Range (VM(DC)) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175 to 970 Transient: Peak Pulse Current (ITM) For 8/20µs Current Wave (See Figure 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40,000 Single Pulse Energy Range For 2ms Current Square Wave (WTM). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 270 to 1050 Operating Ambient Temperature Range (TA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -55 to 85 Storage Temperature Range (TSTG) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -55 to 125 Temperature Coefficient (αV) of Clamping Voltage (VC) at Specified Test Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . <0.01 Hi-Pot Encapsulation (Isolation Voltage Capability) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5000 UNITS V V 2 A J C o C %/oC V o (Dielectric must withstand indicated DC voltage for one minute per MIL-STD 202, Method 301) Insulation Resistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1000 MΩ 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. Device Ratings and Specifications MAXIMUM RATINGS (85 oC) CONTINUOUS PART NUMBER AND DEVICE BRANDING DA DB SPECIFICATIONS (25 oC) TRANSIENT PEAK CURRENT (8/20µs) VRMS VDC ENERGY (2ms) VM(AC) VM(DC) WTM ITM (V) (V) (J) (A) VARISTOR VOLTAGE AT 1mA DC TEST CURRENT MAX CLAMPING VOLT V C AT 200A CURRENT (8/20µs) TYPICAL CAPACITANCE MIN VN(DC) MAX VC f = 1MHz (V) (V) (V) (V) (pF) 1 184 200 228 345 10000 2 V131DA40 V131DB40 130 175 270 40000 V151DA40 V151DB40 150 200 300 40000 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. 1: Peak current applies to applications rated up to 115VRMS . Peak Current is 30kA for applications greater than 115VRMS . 2: Peak current applies to applications rated up to 132VRMS . Peak Current is 30kA for applications greater than 132VRMS . w w w. l i t t e l f u s e . c o m 87 VARISTOR PRODUCTS Absolute Maximum Ratings Varistor Products High Energy Industrial DA/DB Varistor Series Power Dissipation Ratings 100 PERCENT OF RATED VALUE 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 in Figure 1. 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. 90 80 70 60 50 40 30 20 10 0 -55 50 60 70 80 90 100 110 120 130 140 AMBIENT TEMPERATURE ( oC) PERCENT OF PEAK VALUE FIGURE 1. CURRENT, ENERGY AND POWER DERATING CURVE 100 O1 = Virtual Origin of Wave T = Time From 10% to 90% of Peak T1 = Virtual Front time = 1.25 • t T2 = Virtual Time to Half Value (Impulse Duration) Example: For an 8/20µs Current Waveform: 8µs = T1 = Virtual Front Time 20µs = T2 = Virtual Time to Half Value 90 50 10 O1 T TIME T1 T2 FIGURE 2. PEAK PULSE CURRENT TEST WAVEFORM Transient V-I Characteristics Curve MAXIMUM PEAK VOLTS (V) 6,000 5,000 4,000 3,000 TA = -55oC to 85oC MAXIMUM CLAMPING VOLTAGE DISC SIZE 40mm V751DA/DB40 130 TO 750 VM(AC) RATING V661DA/DB40 V571DA/DB40 V511DA/DB40 V481DA/DB40 2,000 1,000 900 800 700 600 500 400 V421DA/DB40 V151DA/DB40 300 V131DA/DB40 200 -2 10 10-1 100 V321DA/DB40 V271DA/DB40 V251DA/DB40 101 102 103 PEAK AMPERES (A) 104 105 FIGURE 3. CLAMPING VOLTAGE FOR V131DA40, V131DB40 - V751DA40, V751DB40 88 w w w. l i t t e l f u s e . c o m 150 Varistor Products High Energy Industrial DA/DB Varistor Series Pulse Rating Curves 50,000 1 2 20,000 DISC SIZE 40mm V131DA40 - V751DA40 V131DB40 - V751DB40 10 5,000 102 2,000 103 104 5 10 6 10 2 1,000 VARISTOR PRODUCTS SURGE CURRENT (A) 10,000 500 200 100 50 INDEFINITE 20 10 20 100 1,000 IMPULSE DURATION ( µs) 10,000 FIGURE 5. SURGE CURRENT RATING CURVES FOR V131DA40, V131DB40 - V751DA40, V751DB40 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. Mechanical Dimensions DB SERIES DA SERIES 60.3 (2.37) “A”DIMENSION: FILISTER HEAD SCREW - 51mm (2.01) PAN HEAD SCREW - 53mm (2.09) ALL DIMENSIONS ARE MAXIMUM EXCEPT WHERE NOTED 44.45 ± 0.75 (1.75 ± 0.03) A 4.3mm (0.170) 15mm (0.59) 25.4 ± 0.75 (1.00 ± 0.03) 46.8 (1.84) 23mm ± 1mm (0.90 ± 0.04) M4 INTERNATIONAL THREAD HOLES 0.23 THRU BORE 0.370 x 0.370 DP 1.6 (0.06) 67mm (2.64) 12.7 (0.50) 40.5 (1.6) 12.7 (0.50) 2 HOLES 6.60 (0.26) 57mm (2.24) 23 (0.90) 62mm (2.44) 6.60 (0.26) 41 (1.61) 4.5mm (0.18) Dimensions in millimeters and (inches). w w w. l i t t e l f u s e . c o m 89