Series VPR 9-8, 10-12, 20 Watt ETT ere WEA Ct BS Description The VPR series is a small, highly-durable, power resistor. Its uniform winding and coating provides uniform heat dissipation and excellent appearance. Made in accordance to MIL-R-26 standards, the VPR series offers lead or bracket mounting options. Features *Rugged vitreous enamel *Low cost *All-welded construction *Solder lead mounting option *Meets or exceeds MIL-R-26 standards *Non-inductive winding available Series VPR Material Specifications Coating Conformal vitreous enamel Core Ceramic Terminals Tinned terminals, solderable to MIL-R-26 standards Weight VPR5F VPR10F VPR20H 5 watt 10 watt 20 watt 192 oz .304 oz. 528 oz. 5.38 gms 8.51 gms. 14.78 gms. Series VPR Electrical Specifications Resistance Tolerance +5% | ohm and over +10% under | ohm Closer tolerances available Power Rating Based on 25C free air rating Minimum Maximum Series Wattage Wattage VPR5F 5 8 VPRIOF 10 12 VPR20H 20 20 F igure I 7 - _ Series VPR Derating 3 ~~ B NN E 0 nw 5 PN a ~ 0 +235 +50 +100 AMBIENT TEMPERATURE IN DEGREES CENTIGRADE +150 +200 +250 +300 +350 Overload 10 times rated wattage for 5 seconds Temperature Coefficient +100 ppm/C (Closer TC available) Dielectric Withstanding Voltage 1000 Vac Lower wattages, maximum hotspot 275C Higher wattages, maximum hotspot 350C 155Figure 2 Series VPR Dimensions 4 Lead Gauge Ax B* ce p** Goat VPR5F 313 .188 1,000 1.50 18 VPR1i0F 313 188 1.750 1.50 18 VPR20H 438 250 2.000 1.50 18 * Maximum Dimensions , ** Dimensional Tolerance: +.250 Series VPR Standard Resistance Values Stock Values 8 WATT VPRSF 1 20 200 750 2250 ~ 8000 1.5 25 225 g00 = 2500 =: 9000 2 30 250 900 3000 10K 3 35 300 1000 3500 = s-:12.5K 4 40 350 1100 4000 15K 5 50 400 1200 4500 = 17.5K 7.5 75 450 1250 5000 20K 10 100 500 1500 6000 22.5K 12 125 600 1750 7000 25K 15 150 700 2000 7500 12 WATT VPRIOF 0.4 20 ~300=. 1250. 7500, 18K, OL 2, 25,2. 350 1500. 3 8000- 20K 12 30 400: 1750 8500 22.5K- 1.3 35 450 2000 9000 25K 1.5 40 500 2250 10K 30K 2 50 600 2500 IK 35K 3 75 700 3000 12K 40K 4 100 750 3500 125K 45K 5 125 800 4000 13.5K 50K 7.5 150 900 4500 = -14.3K 10 200 1000 5000 15K 12 225 1100 6000 16K 15 250 1200 7000 17.5K Standard Resistance Values continued, next column 156 20 WATT VPR20H 0.4 250 1200 3500 15K 70K 0.6 300 1250 4000 20K 75K 0.8 350 1500 4500 25K 80K 5 400 1750 5000 30K 85K 10 500 1850 6000 35K 90K 25 650 2000 7000 40K 95K 50 700 2250 7500 45K 100K 75 750 2400 8000 50K 100 800 2500 9000 55K 150 850 2750 10K 60K 200 1000 3000 12.5K 65K Notes: VPRSF: 10 per pack VPRIOF: 10 per pack VPR20H: 5 per pack Special values available, contact Factory Mounting brackets available: style F-100 TTA MOLL ele Series/Wattage + Resistance = Part Number Example: 10-12 watt + 150 ohms = VPRLOF-150