MP25 Vishay Angstrohm Power Rheostats 100 Watt FEATURES • • • • • • Diameter 3 5/32" [80.17mm] Depth behind panel 1 1/2" [38.10mm] Shaft 1/4" [6.35mm] diameter Rotation 300° ± 5° Weight 0.594 pounds (268 grams) Mounts on panels up to 1/4" [6.35mm] by means of a 3/8" [9.52mm], 32 bushing and hex nut • Non-turn lugs require 3/16" [4.76mm] hole, 1/2" [12.70mm] below center of shaft Model "A" shaft • U. L. Listed, File No. E51076 DIMENSIONS in inches [millimeters] RESISTANCE VALUES* MAXIMUM APPROXIMATE AMPS STEPS 0.5 1.0 2.0 3.0 5.0 7.5 10.0 15.0 25.0 50.0 75.0 100.0 200.0 300.0 400.0 500.0 750.0 1000.0 2000.0 2500.0 5000.0 7500.0 10000.0 14.140 10.000 7.071 5.774 4.472 3.652 3.162 2.582 2.000 1.414 1.155 1.000 0.707 0.557 0.500 0.447 0.365 0.316 0.224 0.200 0.141 0.115 0.100 30 30 56 66 56 66 104 113 144 180 180 216 252 252 252 324 396 410 410 410 685 820 820 * All other intermediate resistance values are available and can be manufactured on a normal delivery cycle. 1 1/2 [38.10] 3 5/32 [80.17] Dia. Knob # 552 7/8 [22.22] 1/2 [12.70] 3/8 [9.52] 1/16 [1.59] 2 1/16 [52.39] R 3/4 [19.05] Dial # 548 2 1/64 (3) .162 [4.11] Holes 1 1/2 [38.10] 1/4 [6.35] 3/8 [9.52] [51.20] 7/32 [5.56] 3/32 [2.38] 2 1/4 [57.15] DERATING Angstrohm rheostat standard wattage ratings are based on a 300°C rise in “free-air” in ambient not exceeding + 40°C (shown). For other applications, wattage ratings are available based on 340°C rise in "free-air" in ambient not exceeding + 25°C, and in other cases + 50°C. % OF RATED LOAD TOTAL OHMS 120 100 80 60 40 20 0 40 100 150 200 250 300 AMBIENT TEMP. DEG. CENTIGRADE 350 SPECIAL SHAFTS in inches [millimeters] 1/2 [12.70] 11/32 [8.73] TYPE B: 1/2 [12.70], 11/32 [8.73] Models. Slotted shaft with standard bushing for 1/8 [3.18] panel. MARKING — Resistance value — Amps — Date code www.vishay.com 6 3/4 [19.05] 5/8 [15.88] TYPE C: 3/4 [19.05], 5/8 [15.88] Models. Locking bushing with slotted shaft for 1/4 [6.35] panel. 5/8 [15.88] 1/2 [12.70] TYPE D: 5/8 [15.88], 1/2 [12.70] Models. Locking bushing with slotted shaft for 1/8 [3.18] panel. 27/32 [21.43] 11/32 [8.73] TYPE E: 27/32 [21.43], 11/32 [8.73] Models. Std. bushing and flatted shaft w/screwdriver slot for 1/8 [3.18] panel. ORDERING INFORMATION MP25 MODEL A BUSHING AND SHAFT CONFIGURATION 25 VALUE A = Standard Flatted Shaft NOTE: For Additional Features: Submit detailed drawing information when ordering “non-standard” parts. Document Number: 66104 Revision 25-Aug-00