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
•
•
•
•
•
•
RESISTANCE VALUES*
TOTAL
OHMS
MAXIMUM APPROXIMATE
AMPS
STEPS
DIMENSIONS
in inches [millimeters]
1 1/2
[38.10]
7/8
[22.22]
Knob # 552
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
3 5/32
[80.17]
Dia.
3/8
[9.52]
1/2
[12.70]
1/16
[1.59]
1/4
[6.35]
1 1/2
[38.10]
3/4
[19.05]
2 1/16
[52.39] R
2 1/64
(3) .162 [4.11] Holes
[51.20]
Dial # 548
3/8 [9.52]
3/32
[2.38]
2 1/4 [57.15]
7/32
[5.56]
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
120
100
80
60
40
20
0
40
100
150
200
250
300
AMBIENT TEMP. DEG. CENTIGRADE
350
* All other intermediate resistance values are available
and can be manufactured on a normal delivery cycle.
SPECIAL SHAFTS
in inches [millimeters]
1/2
[12.70]
11/32 [8.73]
3/4
[19.05]
5/8 [15.88]
5/8
[15.88]
1/2 [12.70]
27/32
[21.43]
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.
TYPE C: 3/4 [19.05], 5/8 [15.88]
Models. Locking bushing with
slotted shaft for 1/4 [6.35] panel.
TYPE D: 5/8 [15.88], 1/2 [12.70]
Models. Locking bushing with
slotted shaft for 1/8 [3.18] panel.
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.
MARKING
— Resistance value
— Amps
— Date code
ORDERING INFORMATION
MP25
MODEL
A
BUSHING AND SHAFT CONFIGURATION
A = Standard Flatted Shaft
NOTE:
For Additional Features: Submit detailed drawing information when ordering “non-standard” parts.
25
VALUE
www.vishay.com
6
Document Number: 66104
Revision 25-Aug-00
MCU
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