74
Ohmite Mfg. Co.
1600 Golf Rd., Suite 850, Rolling Meadows, IL 60008 • Tel. 1-866-9-OHMITE • Fax 1-847-574-7522 • www.ohmite.com • info@ohmite.com
Rheostats
(Potentiometers) Wirewound
Dimensions for reference only; consult factory for details.
Since all rheostats/potentiometers are electro-mechanical
devices, they are subject to mechanical wear and, therefore,
D
0.25"
6.35 mm
enc
losed
unenc
losed
standard
shaft
0.125"
3.18 mm
0.625"
15.88 mm
B
0.25"
6.35 mm
0.078"
1.98 mm
C
0.531"
13.49 mm
0.406"
10.32 mm
shaft
locking
nut
0.094"
2.38 mm
B
D
locking
shaft
0.375"
9.53 mm
D
M M
0.25 - 20 thread for
mounting screws
0.031"
0.79 mm
2"
51 mm
B
1.563"
39.7 mm
C
holes for
no. 8 screws
Ohmic
Voltage
Behind panel
Diameter
Dimension
Rotation
Model
Type
Watts
range
Core
(RMS)
“B” (In./
mm
)
“D” (In./
mm
)
“C” (In./
mm
)
Shaft torque
(±5°)
E
RES/REL
RES/REL
12.5
12.5
1.0-15K
1.0-15K
open
open
305
305
0.688/
0.688/
17.46
17.46
0.875/
0.875/
22.23
22.23
22.23 22.23
0.594/
0.594/
15.08
15.08
1-6 oz. in.
1-6 oz. in.
300°
300°
H
RHS/RHL
25
1.0-25K
open
500
1.375/
34.93
1.560/
39.62
39.62 39.62
0.940/
23.88
0.25-0.5 lb. in.
300°
J
J
RJS
RJS
50
50
0.5-50K
0.5-50K
open
open
750
750
1.375/
1.375/
34.93
34.93
2.31 /
2.31 /
58.67
58.67
58.67 58.67
1.56 /
1.56 /
39.62
39.62
0.25-2 lb. in.
0.25-2 lb. in.
300°
300°
G
RGS
75
0.5-50K
open
900
1.750/
44.45
2.75 /
69.25
69.25 69.25
1.78 /
45.21
0.5-2 lb. in.
300°
K
RKS
RKS
100
100
0.5-50K
0.5-50K
open
open
1000
1000
1.750/
1.750/
44.45
44.45
3.125/
3.125/
79.38
79.38
79.38 79.38
1.91 /
1.91 /
48.51
48.51
0.5-2 lb. in.
0.5-2 lb. in.
300°
300°
L
RLS
150
0.5-50K
open
1200
2.000 /
50.8
4.00 /
101.60
101.60 101.60
2.28 /
57.91
0.5-3 lb. in.
300°
P
RPS
RPS
225
225
1.0-30K
1.0-30K
open
open
1300
1300
2.125/
2.125/
53.98
53.98
5.00 /
5.00 /
127.00
127.00
127.00 127.00
2.97 /
2.97 /
75.44
75.44
2.5-4 lb. in.
2.5-4 lb. in.
310°
310°
N
RNS
300
1.0-50K
open
1225
2.375/
60.33
6.00 /
152.40
152.40 152.40
3.44 /
87.38
2.5-5 lb. in.
320°
R
RRS
RRS
500
500
1.0-20K
1.0-20K
open
open
1450
1450
2.125/
2.125/
53.98
53.98
8.00 /
8.00 /
203.20
203.20
203.20 203.20
4.31/
4.31/
109.47
109.47
109.47 109.47
4.5-7 lb. in.
4.5-7 lb. in.
325°
325°
U
RUS
1000
1.0-20K
open
1600
3.000 /
76.2
12.00 /
304.80
304.80 304.80
6.38/
162.05
162.05 162.05
3.5-7 lb. in.
335°
C
C
RCS/RCL
RCS/RCL
7.5
7.5
10.0-5K
10.0-5K
enclosed
enclosed
305
305
0.875/
0.875/
22.23
22.23
0.515/
0.515/
13.08
13.08
13.08 13.08
—
0.25-3 oz. in.
0.25-3 oz. in.
300°
300°
E
REE
12.5
1.0-15K
enclosed
305
1.219/
30.96
1.047/
26.59
26.59 26.59
—
1-6 oz. in.
300°
• Models H, J, G, and K also available in enclosed versions.
• See Catalog #203 for complete details.
Made-to-order rheostats available: Contact nearest Ohmite sales office.
Model E
Models P, N, R, U
Models H, J, G, K, L
Dimension “M”
P
0.875”
22.23 mm
N
1.188”
30.16 mm
R
1.5”
38.1 mm
U
3”
76.2 mm
D
0.25"
6.4 mm
0.125"
3.18 mm
0.625"
15.88 mm
0.625"
15.88 mm
B
0.25"
6.4 mm
0.109"
2.78 mm
0.531"
13.49 mm
0.25"
6.4 mm
Standard
shaft
Locking
shaft
Mounting:
Panels to
0.125” (3.18mm) thick
with 0.25-32 bushing and
hex nut (0.063” thick).
Mounting:
Panels to 0.125” (3.18mm) thick with
0.25-32 bushing and hex nut (0.063” thick).
Mounting:
Panels to 0.25” (6.35mm) thick with 0.375-32 bushing and hex nut
(0.094” thick) (or with 10-32 x 0.75 F.H. screws for model L only).
Mounting:
Panels
to 1.25” (31.75mm)
thick with 0.25-20
flat-head screws.
0.5"
12.7 mm
holes for:
no. 2 screws (model H)
no. 8 screws (J, G, K, L) mounting
bracket on
model L only
0.875"
22.23 mm
D
drill 0.188"
(4.76 mm) hole
in panel
0.25"
6.35 mm
0.031"
0.79 mm
0.344"
8.73 mm
0.031"
0.79 mm
0.063"
1.59 mm
0.375"
9.53 mm
0.875"
22.23 mm
B
C
0.75"
19.05 mm
bushing
projection
0.625"
15.88 mm
shaft
locking
nut
standard shaft
(models H, J, G, K, L)
locking shaft
(only model H
stocked)
See page 78 for knobs,
dials, and other hardware
Model C
STOCK PART NUMBERS FOR STANDARD RESISTANCE VALUES
Ohmite Mfg. Co.
1600 Golf Rd., Suite 850, Rolling Meadows, IL 60008 • Tel. 1-866-9-OHMITE • Fax 1-847-574-7522 • www.ohmite.com • info@ohmite.com
75
0.5
–––R50
10.0
12.3
14.1
17.3
1
–––1R0
3.53
5.00
7.07
8.66
10
12.3
15.0
17.32
22.3
31.6
1.5
–––1R5
18.2
25.8
2
–––2R0
2.50
3.54
5.00
6.12
7.07
8.65
10.6
12.24
15.8
22.4
2.5
–––2R5
2.24
14.1
20.0
3
–––3R0
2.04
2.88
5.00
5.75
7.07
8.66
10.00
12.9
18.3
4
–––4R0
3.53
7.50
8.66
11.2
15.8
5
–––5R0
1.58
3.88
4.47
5.48
6.71
7.75
10.0
14.1
6
–––6R0
1.44
2.04
2.88
7.5
–––7R5
3.16
3.65
4.47
5.49
6.32
8
–––8R0
1.25
1.77
2.50
7.90
11.2
10
–––10R
0.86
1.12
1.58
2.74
3.16
3.88
4.74
5.48
10.0
12
–––12R
2.04
12.5
–––12R5
6.30
8.95
15
–––15R
0.71
0.91
1.29
3.163
3.87
4.47
16
–––16R
1.76
2.17
2.50
5.60
7.90
22
–––22R
1.50
25
–––25R
0.55
0.71
1.00
1.73
2.0
2.450
3.00
3.46
4.47
6.33
35
–––35R
0.46
0.60
0.845
1.19
2.070
40
–––40R
3.54
50
–––50R
0.39
0.50
0.707
1.00
1.23
1.41
1.735
2.12
2.45
3.16
4.47
75
–––75R
0.32
0.40
0.575
1.00
1.15
1.415
1.73
2.00
3.65
80
–––80R
0.790
2.52
100
–––100
0.27
0.36
0.500
0.866
1.00
1.225
1.50
1.73
3.16
125
–––125
0.32
0.445
0.630
2.00
150
–––150
0.22
0.29
0.575
1.000
1.22
1.41
160
–––160
175
–––175
0.27
0.375
1.69
2.39
200
–––200
0.19
0.25
0.612
0.707
0.865
1.06
1.22
225
–––225
0.470
2.11
250
–––250
0.17
0.22
0.316
0.775
1.41
300
–––300
0.408
0.500
0.575
0.866
1.00
1.83
325
–––325
1.24
350
–––350
0.15
0.19
0.267
0.655
400
–––400
0.433
0.500
0.750
0.866
1.48
500
–––500
0.12
0.16
0.222
0.316
0.388
0.447
0.548
1.00
1.41
600
–––600
700
–––700
0.567
0.655
750
–––750
0.10
0.13
0.182
0.316
0.365
0.447
0.817
1.15
800
–––800
0.250
900
–––900
0.500
0.578
1000
–––1K0
0.086
0.10
0.155
0.224
0.274
0.316
0.707
1.00
1200
–––1K2
0.433
0.500
1250
–––1K25
0.346
1500
–––1K5
0.071
0.090
0.129
0.224
0.258
0.387
0.447
0.577
0.816
1600
–––1K6
0.176
1750
–––1K75
0.358
0.414
1800
–––1K8
0.288
2000
–––2K0
0.194
0.224
0.336
0.387
0.500
2250
–––2K25
0.259
2500
–––2K5
0.055
0.070
0.100
0.141
0.173
0.200
0.300
0.346
0.447
0.633
3000
–––3K0
0.224
3500
–––3K5
0.046
0.060
0.084
0.119
4500
–––4K5
0.182
5000
–––5K0
0.039
0.050
0.070
0.100
0.123
0.141
7500
–––7K5
0.041
0.058
0.100
0.115
0.141
8000
–––8K0
0.079
10000
–––10K
0.035
0.050
0.070
0.087
0.100
0.122
12500
–––12K5
0.031
15000
–––15K
0.029
0.041
0.058
20000
–––20K
0.035
0.050
25000
–––25K
0.032
0.045
30000
–––30K
0.041
40000
–––40K
0.035
50000
–––50K
0.032
Ohmic value
RCS
–––
Std. shaft
7.5W Model C
Part No.
Prefix
Suffix
RCL
–––
Locking
Amps max.
REL
–––
Locking
12.5W Model E
REE
–––
Enclosed
Amps max.
RES
–––
Std. shaft
RHS
–––
Std. shaft
25W Model H
RHL
–––
Locking
Amps max.
RJS
–––
Amps max.
RGS
–––
Amps max.
RKS
–––
Amps max.
RLS
–––
Amps max.
RPS
–––
Amps max.
RNS
–––
Amps max.
RRS
–––
Amps max.
RUS
–––
Amps max.
50W
Model J
75W
Model G
100W
Model K
150W
Model L
225W
Model P
300W
Model N
500W
Model R
1000W
Model U
=
Most popular stock values
=
Stock values
Stock values
=
Non-stock values subject to minimum han-
Non-stock values subject to minimum han-
Non-stock values subject to minimum han-
dling charge per item
dling charge per item
Non-stock values subject to minimum han-
dling charge per item
Non-stock values subject to minimum han-
Rheostats are silicone-ceramic coated at and
Rheostats are silicone-ceramic coated at and
Rheostats are silicone-ceramic coated at and
above the following ohmic values:
above the following ohmic values:
above the following ohmic values:
Model C: all
Model C: all
Model G: 5000
Model G: 5000
Model G: 5000
Ω
Ω
Model E: 3500
Model E: 3500
Ω
Ω
Model K: 7500
Model K: 7500
Model K: 7500
Ω
Ω
Model H: 7500
Model H: 7500
Ω
Ω
Model L: 7500
Model L: 7500
Model L: 7500
Ω
Ω
Model J: 15,000
Model J: 15,000
Ω
Ω