Series VPA & VKA Description The VPA and VKA adjustable-power resistors are excellent for applications requiring settings at different resistance values. The resistors come equipped with an adjustable slider lug, making them ideal for adjusting circuits, obtaining odd resistance values, and setting equipment to meet various line voltages. The VPA and VKA series are made in accordance to MIL-R-26 standards. These resistors can be bracket mounted. Series VPA & VKA Material Specifications Coating Vitreous enamel Core Tubular ceramic Terminals Tinned, lug terminals, solderable to MIL-R-26 Weight VPIOFA VP25KA VPSOKA VILQQNA VKI60WA VK200WK 10 watt 25 watt 50 watt 100 watt = 1 t 200 watt .32 02. .8 02. 1.44 oz. 3.2 02. oz. 8.96 gms. 22.4 gms. 40.3 gms. Series VPA & VKA Electrical Specifications Resistance Tolerance +10% standard Closer tolerances available. Gems. 224 gms, 277.8 Power Rating Based on 25C free air rating Maximum Features *Adjustable slider lug *Rugged vitreous enamel *All-welded construction *Meets or exceeds MIL-R-19365 standards. Standard Series Wattage Wattage VP1OFA 10 12 VP25KA 25 N/A VPSOKA 50 N/A VICTOONAL +80 Nba VACA, +66 +75 WAAR 200 225 N/A = Not applicable. Figure 1 Series VPA & VKA Derating 100 3 . pS Sw pS S p f 0 +25 +5000 #100150 #200 #280 DH AMBIENT TEMPERATURE IN DEGREES CENTIGRADE Electrical Specifications continued, next page 159 Electrical Specifications, continued Overload 10 times rated wattage for 5 seconds Temperature Coefficient +100 ppm/C Dielectric Withstanding Voltage 1000 Vac When dual wattages are shown: Lower wattages have maximum hotspot 275C; Higher wattages have maximum hotspot 350C. Stated wattage applies only when full resistance is in the circuit. Setting the slider lug at an intermediate point reduces the wattage rating by the approximate same proportion. Example: Lug at 50%, wattage is reduced by 50%. Figure 2 Series VPA Dimensions (~~ ff] \\W4Y 4 Series VPA & VKA Standard Resistance Values Stock Values 12 WATT VPIOFA ADJUSTABLE 1 20 250 800 3500 8000 2 24 300 1000 4000 8500 3 50 350 1250 4500 9000 5 75 400 1500 5000 10K TA 100 500 2250 6000 10 150 600 2500 TO00 15 200 750 3000 7500 25 WATT VP25KA ADJUSTABLE 1 20 300 2000 6000 15K 2 25 400 2250 7000 20K 3 50 500 2500 7200 25K 4 75 750 3000 7500 5 1O0 800 3500 8000 7S 150 1000 4000 9000 10 200 1250 4500 10K 15 250 150K} 000 12K 50 WATT VPSOKA ADJUSTABLE ] 50 500 2500 ? 715 750 3000 3 100 B00 3500 4 150 1000 4000 5 200 1250 4500 10 250 1500 5000 20 300 2000 6000 24 400 2250 TOK) VKLQONA ADJUSTABLE 30K 40K 50K 20K 75K 25K K VK200WA SX ADJUSTABLE 500 10K A* Be c* 1000 15K 1500 20K 2500 25K VPLOFA .313 4.750 188 5000 30K VP25KA 562 2.000 313 Notes: - . Special resistance values available. VP5OKA 962 4.000 313 Mounting brackets sold separately. CONTINUED For specials, please consult Factory. ----- DISCON ED oem VKLOONA > Series Bracket Number VKL60WA ----- DISCONTINUED ----- VPIOFA F-100 VP25KA K-100 VK200WA DISCONTINUED VPSOKA K-100 * Maximum Dimensions Beli codee Cel PTO re LLCO, STS ye Yo, ieee Waray reer BG ee Cem REO te Series/Wattage + Resistance Value = Part Number Example: 25 watt adjustable + 150 ohms = VP25KA-150 ioe