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Varistor Products
Base Mount
PA Varistor Series
The PA Series of transient surge suppressors are metal-oxide varistors (MOVs) featuring a rigid base mount package construction, and are useful in applications which are subject to vibration. These UL and CSA recognized varistors are available in a wide range of operating voltages, from 130V to 660V VM(AC)RMS . The base-mount package has a quick-connect tab terminal that provides a fast, secure lead attach. The mounting base forms the second electrical connection, usually chassis ground. Meeting rigid NEMA standards, PA series varistors have a creep and strike distance capability that minimizes breakdown along the package surface. See PA Series Device Ratings and Specifications table for part number and brand information.
(R)
(R)
Features
* Wide Operating Voltage Range VM(AC)RMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .130V to 660V * Creep and Strike Distance Capability Meets Rigid NEMA Standards * Base Mount Construction Forms One Electrical Connection * Quick Connect Tab Terminal * No Derating Up to 85oC Ambient
AGENCY APPROVALS: Recognized under the components program of Underwriters Laboratories. Certified by CSA. AGENCY FILE NUMBERS: UL E75961, CSA LR91788.
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Varistor Products
Base Mount
PA Varistor Series
Absolute Maximum Ratings
For ratings of individual members of a series, see Device Ratings and Specifications chart
Continuous: PA SERIES Steady State Applied Voltage: AC Voltage Range (VM(AC)RMS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130 to 660 DC Voltage Range (VM(DC)) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175 to 850 Transient: Peak Pulse Current (ITM) For 8/20s Current Wave (See Figure 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6500 Single Pulse Energy Range For 10/1000s Current Wave (WTM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70 to 250 Operating Ambient Temperature Range (TA). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -55 to 85 Storage Temperature Range (TSTG) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -55 to 125 Temperature Coefficient (V) of Clamping Voltage (VC) at Specified Test Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . <0.01
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.
UNITS
V V
2
VARISTOR PRODUCTS
A J C O C %/OC
O
Device Ratings and Specifications
MAXIMUM RATINGS (85 oC) CONTINUOUS TRANSIENT ENERGY (10/1000s) WTM (J) 70 70 80 80 130 130 140 140 160 160 165 165 170 170 180 180 190 190 220 220 250 PEAK CURRENT (8/20s) ITM (A) 6500 6500 6500 6500 6500 6500 6500 6500 6500 6500 6500 6500 6500 6500 6500 6500 6500 6500 6500 6500 6500 VARISTOR VOLTAGE AT 1mA DC TEST CURRENT MIN (V) 184 184 212 212 354 354 389 389 462 462 500 500 610 610 670 670 735 735 805 805 940 VN(DC) (V) 200 200 240 240 390 390 430 430 510 510 559 535 680 680 750 750 820 820 910 910 1050 MAX (V) 243 220 284 243 453 413 494 453 565 540 618 570 790 690 860 790 963 860 1050 960 1210 MAX CLAMPING VOLT V C AT TEST CURRENT (8/20s) VC (V) 360 325 420 360 675 620 740 680 850 800 910 840 1160 1050 1280 1160 1410 1280 1560 1410 1820 IP (A) 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 TYPICAL CAPACITANCE f = 1MHz (pF) 1900 1900 1600 1600 1000 1000 900 900 750 750 700 700 600 600 550 550 500 500 450 450 400
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SPECIFICATIONS (25 oC)
VRMS PART NUMBER AND DEVICE BRANDING V130PA20A V130PA20C V150PA20A V150PA20C V250PA40A V250PA40C V275PA40A V275PA40C V320PA40A V320PA40C V350PA40A V350PA40C V420PA40A V420PA40C V480PA80A V480PA80C V510PA80A V510PA80C V575PA80A V575PA80C V660PA100A VM(AC) (V) 130 130 150 150 250 250 275 275 320 320 350 350 420 420 480 480 510 510 575 575 660
VDC VM(DC) (V) 175 175 200 200 330 330 369 369 420 420 460 460 560 560 640 640 675 675 730 730 850
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Varistor Products
Base Mount
PA Varistor Series
Power Dissipation Ratings
PERCENT OF RATED VALUE 100 90 80 70 60 50 40 30 20 10 0 -55 50 60 70 80 90 100 110 120 130 140 150
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.
AMBIENT TEMPERATURE ( oC)
FIGURE 1. CURRENT, ENERGY AND POWER DERATING CURVE
PERCENT OF PEAK VALUE
100 90
50
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 8/20s Current Waveform: 8s = T1 = Virtual Front Time 20s = T2 = Virtual Time to Half Value
10 O1 T T1 T2 TIME
FIGURE 2. PEAK PULSE CURRENT TEST WAVEFORM
Transient V-I Characteristics Curves
6,000 5,000 4,000 MAXIMUM PEAK VOLTS (V) 3,000 2,000 MAXIMUM CLAMPING VOLTAGE V660PA80A "A" SUFFIX V575PA80A 130 TO 660VM(AC) RATING V510PA80A oC TO 85oC TA = -55 V480PA80A V420PA80A 6,000 5,000 4,000 MAXIMUM PEAK VOLTS (V) 3,000 2,000 MAXIMUM CLAMPINGVOLTAGE "C"SUFFIX 130 TO 660VM(AC) RATING TA = -55oC TO 85oC
V660PA100C V575PA80C V510PA80C V480PA80C V420PA80C
1,000 900 A40A 800 700 600 500 V320PA40A 400 V150PA20A 300 V130PA20A 200 -3 10 10-2
V275PA40A V250PA40A
1,000 900 800 700 V350PA40C 600 500 400 V320PA40C 300 V150PA20C
V275PA40C V250PA40C
10-1
100 101 102 PEAK AMPERES (A)
103
104
V130PA20C 200 10-3 10-2
10-1
100 101 102 PEAK AMPERES (A)
103
104
FIGURE 3. CLAMPING VOLTAGE FOR V130PA20A V660PA100A
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FIGURE 4. CLAMPING VOLTAGE FOR V130PA20C V660PA100C
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Varistor Products
Base Mount
PA Varistor Series
Pulse Rating Curves
10,000 5,000 2,000 SURGE CURRENT (A) 1,000 500 200 100 50 20 10 5 2 1 20 100 1,000 IMPULSE DURA TION ( s) 10,000 INDEFINITE 1 2 10 102 DISC SIZE 20mm V130PA20A -V320PA40C 104 105 106 10,000 5,000 2,000 SURGE CURRENT (A) 1,000 500 200 100 50 20 10 5 2 1 20 100 1,000 IMPULSE DURA TION ( s) 10,000 INDEFINITE 1 2 10 DISC SIZE 20mm V420PA40A -V660PA100C 102 3 10 104 105 106 103
2
VARISTOR PRODUCTS
FIGURE 5. SURGE CURRENT RATING CURVES FOR V130PA20A - V320PA40C
FIGURE 6. SURGE CURRENT RATING CURVES FOR V420PA40A - V660PA100C
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 transient protection
Mechanical Dimensions
D Q S F C B TC OP 2 HOLES T OD1 b b3 OT TAB E J b2 H1, 2, 3 A h SEATING PLANE
SYMBOL A b b2 b3 B C D OD1
MILLIMETERS MIN 3.94 3.05 7.50 5.6 50.6 18.4 2.8 NOM 4.06 3.17 11.2 7.62 0.8 50.8 19.2 3.2 MAX 14.3 6.6 MIN -
INCHES NOM 0.160 0.125 0.440 0.300 0.030 2.000 0.75 0.126 MAX 0.570 0.260 0.165 0.130 0.510 0.260 2.610 1.320 0.305 0.040 1.010 1.120 1.290 0.320 0.240 2.010 0.78 0.040 NOTES 1 3 3 3 2
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4.18 0.155 3.29 0.120 12.9 6.6 66.3 33.5 -
NOTES: 1. Tab is designed to fit 1/4" quick-connect terminal. 2. Case temperature is measured at TC on top surface of base plate. 3. H1 (130-150VRMS devices). H2 (250-320VRMS devices). H3 (420-660VRMS devices). 4. Electrical connection: top terminal and base plate. 5. Typical weight: 30g.
E F h H1 H2 H3 J OP Q S T OT TC
7.75 0.295 1.0 25.6 28.3 32.8 8.1 6.0 51.0 20.0 1.0 0.220 1.990 0.72 0.110 -
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Varistor Products
Base Mount
PA Varistor Series
Suggested Hardware and Mounting Arrangements
TYPICAL NON-ISOLATED MOUNTING TYPICAL ISOLATED MOUNTING
#10-32 PAN HEAD SCREW THERMAL QUICK CONNECT (NOTE 6) THERMAL GREASE LA YER
#6-32 SCREW #6 FLA WASHER T PHENOLIC SHOULDER WASHER SPACER VARISTOR MICA INSULATOR MOUNTING SURFACE LOCK WASHER #6-32 NUT
#10 FLA WASHER T THERMAL GREASE LA YER VARISTOR MOUNTING SURFACE LOCK WASHER #10-32 NUT
NOTE: 6. GE G623, Dow Corning, DC3, 4, 340, or 640 Thermal Grease recommended for best heat transfer.
1,000V Isolation Kit containing the following parts can be ordered by part #A7811055 (Qty).
(1) MICA insulation 1"/3.1"/0.005" thick (1) 1/4 " quick-connect terminal (2) Phenolic shoulder washer (1) Spacer (2) #6-32/3 / 4 screw (2) #6-32 nut (2) #6 internal tooth lock washer (2) #6 flat washer
Ordering Information
V XXX PA XX X
VARISTOR CLAMPING VOLTAGE SELECTION DESIGNATOR A = Standard C = Low Clamp Voltage Option RELATIVE ENERGY INDICATOR SERIES DESIGNATOR
VM(AC) 130V to 660V
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