鈥?/div>
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擄C rise in 鈥渇ree-air鈥?in ambient not
exceeding + 40擄C (shown). For
other applications, wattage ratings
are available based on 340擄C rise in
"free-air" in ambient not exceeding
+ 25擄C, and in other cases + 50擄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
鈥?Resistance value
鈥?Amps
鈥?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 鈥渘on-standard鈥?parts.
25
VALUE
www.vishay.com
6
Document Number: 66104
Revision 25-Aug-00
1
