Rheostats
Model C
Mounting:
Panels
to 0.125” (3.18mm)
thick with 0.25-32
bushing and hex
0.25"
6.4 mm
nut (0.063” thick).
D
Model E
D
0.25"
6.35 mm
unenclosed
(Potentiometers) Wirewound
0.531"
13.49 mm
Locking
shaft
0.125"
3.18 mm
0.625"
15.88 mm
B
0.531"
shaft
13.49 mm
locking
nut
standard
shaft
0.25"
6.35 mm
Mounting:
Panels to
0.125” (3.18mm) thick
enclosed
with 0.25-32 bushing and
hex nut (0.063” thick).
0.094"
2.38 mm
C
0.078"
1.98 mm
locking
shaft
0.406"
10.32 mm
D
0.125"
3.18 mm
B
0.625"
0.625"
15.88 mm 15.88 mm
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
Mounting:
Panels
to 1.25” (31.75mm)
thick with 0.25-20
flat-head screws.
0.375"
9.53 mm
0.75"
19.05 mm
bushing
projection
0.625"
15.88 mm
B
Models P, N, R, U
M
M
0.25"
6.4 mm
0.25"
6.4 mm
0.109"
2.78 mm
Standard
shaft
2"
51 mm
B
0.375"
9.53 mm
D
0.031"
0.79 mm
C
Models H, J, G, K, L
1.75"
44.5 mm
0.031"
0.79 mm
0.25"
6.35 mm
D
0.5"
12.7 mm
drill 0.188"
(4.76 mm) hole
in panel
holes for:
no. 2 screws (model H)
no. 8 screws (J, G, K, L) mounting
bracket on
model L only
holes for
no. 8 screws
0.25 - 20 thread for
mounting screws
1.563"
39.7 mm
0.031"
0.79 mm
0.344"
8.73 mm
0.875"
22.23 mm
0.063"
1.59 mm
B
C
O R D E R I N G I N F O R M AT I O N
shaft
locking
nut
locking shaft
(only model H
stocked)
Series
Rheostats
Wirewound
Potentiometers
E = RoHS compliant
RCSR50E
Resistance Value*
Example:
R50 = 0.50Ω
1R0 = 1Ω
7R5 = 7.5Ω
250 =
250Ω
1K0 = 1,000Ω
1K75 = 1,750Ω
4K5 = 4,500Ω
50K = 50,000Ω
*Check Table for
Standard
Resistance Values
and Maximum
Current Values
standard shaft
(models H, J, G, K, L)
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).
Dimensions for reference only; consult factory for details.
Since all rheostats/potentiometers are electro-mechanical devices, they
are subject to mechanical wear and, therefore, have a finite life.
Models H, J, K, L and N are listed under UL Reexamination Service File
No. E-10946 and CSA File No. 21309 unless noted otherwise.
All rheostats are 10% tolerance.
See page 93 for
knobs, dials, and
other hardware
Code Watts Model Shaft
Core
CL =
7.5
C
Locking Enclosed
CS =
7.5
C Standard Enclosed
EE =
12.5
E Standard Enclosed
EL =
12.5
E
Locking
Open
ES =
12.5
E Standard
Open
GS =
75
G Standard
Open
HL =
25
H
Locking
Open
HS =
25
H Standard
Open
JS =
50
J Standard
Open
KS =
100
K Standard
Open
LS =
150
L Standard
Open
NS =
300
N Standard
Open
PS =
225
P Standard
Open
RS =
500
R Standard
Open
US = 1000
U Standard
Open
Model Type
E
RES/REL
H
RHS/RHL
J
RJS
G
RGS
K
RKS
L
RLS
P
RPS
N
RNS
R
RRS
U
RUS
C
RCS/RCL
E
REE
Watts
12.5
25
50
75
100
150
225
300
500
1000
7.5
12.5
Ohmic
range
1.0-15K
1.0-25K
0.5-50K
0.5-50K
0.5-50K
0.5-50K
1.0-30K
1.0-50K
1.0-20K
1.0-20K
10.0-5K
1.0-15K
Max. Voltage
Core
(RMS)*
open
305
open
500
open
750
open
900
open
1000
open
1200
open
1300
open
1225
open
1450
open
1600
enclosed
305
enclosed
305
Behind panel
“B” (In./mm)
0.688/17.46
1.375/34.93
1.375/34.93
1.750/44.45
1.750/44.45
2.000 /
50.8
2.125/53.98
2.375/60.33
2.125/53.98
3.000 /
76.2
0.875/22.23
1.219/30.96
Diameter
“D” (In./mm)
0.875/
22.23
1.560/
39.62
2.31 /
58.67
2.75 /
69.25
3.125/
79.38
4.00 /101.60
5.00 /127.00
6.00 /152.40
8.00 /203.20
12.00 /304.80
0.515/
13.08
1.047/
26.59
Dimension
“C” (In./mm)
0.594/15.08
0.940/23.88
1.56 /39.62
1.78 /45.21
1.91 /48.51
2.28 /57.91
2.97 /75.44
3.44 /87.38
4.31/109.47
6.38/162.05
—
—
Shaft torque
1-6 oz. in.
0.25-0.5 lb. in.
0.25-2 lb. in.
0.5-2 lb. in.
0.5-2 lb. in.
0.5-3 lb. in.
2.5-4 lb. in.
2.5-5 lb. in.
4.5-7 lb. in.
3.5-7 lb. in.
0.25-3 oz. in.
1-6 oz. in.
Rotation
(±5°)
300°
300°
300°
300°
300°
300°
310°
320°
325°
335°
300°
300°
• Models H, J, G, and K also available in enclosed versions.
• See Catalog #203 for complete details.
• RoHS compliant product available. Add “E” suffix to part number to specify.
• Made-to-order rheostats available: Contact nearest Ohmite sales office.
* Voltage rating dependent on resistance value.
S TA N D A R D pA RT N u M b E R S F O R R h E O S TAT S
7.5W Model C
RCS–––
Std. shaft
RCL–––
Locking
12.5W Model E
RES–––
Std. shaft
REE–––
Enclosed
REL–––
Locking
25W Model H
RHS–––
Std. shaft
RHL–––
Locking
50W
Model J
Amps max.
75W
Model G
Amps max.
100W
Model K
Amps max.
150W
Model L
Amps max.
225W
Model P
Amps max.
300W
Model N
Amps max.
500W
Model R
Amps max.
1000W
Model U
Amps max.
31.6
25.8
22.4
20.0
18.3
15.8
14.1
Ohmic value
Amps max.
RGS–––
RNS–––
RRS–––
0.5
1
1.5
2
2.5
3
4
5
6
7.5
8
10
12
12.5
15
16
22
25
35
40
50
75
80
100
125
150
160
175
200
225
250
300
325
350
400
500
600
700
750
800
900
1000
1200
1250
1500
1600
1750
1800
2000
2250
2500
3000
3500
4500
5000
7500
8000
10000
12500
15000
20000
25000
30000
40000
50000
–––R50
–––1R0
–––1R5
–––2R0
–––2R5
–––3R0
–––4R0
–––5R0
–––6R0
–––7R5
–––8R0
–––10R
–––12R
–––12R5
–––15R
–––16R
–––22R
–––25R
–––35R
–––40R
–––50R
–––75R
–––80R
–––100
–––125
–––150
–––160
–––175
–––200
–––225
–––250
–––300
–––325
–––350
–––400
–––500
–––600
–––700
–––750
–––800
–––900
–––1K0
–––1K2
–––1K25
–––1K5
–––1K6
–––1K75
–––1K8
–––2K0
–––2K25
–––2K5
–––3K0
–––3K5
–––4K5
–––5K0
–––7K5
–––8K0
–––10K
–––12K5
–––15K
–––20K
–––25K
–––30K
–––40K
–––50K
3.53
2.50
2.24
2.04
1.58
1.44
1.25
1.12
5.00
3.54
2.88
10.0
7.07
5.00
12.3
8.66
6.12
5.00
14.1
10
7.07
5.75
4.47
3.65
3.16
17.3
12.3
8.65
7.07
5.48
4.47
3.88
15.0
10.6
8.66
7.50
6.71
5.49
4.74
17.32
12.24
10.00
8.66
7.75
6.32
3.53
3.88
2.04
1.77
1.58
2.88
3.16
2.50
2.74
2.04
0.86
22.3
18.2
15.8
14.1
12.9
11.2
10.0
7.90
5.48
6.30
0.71
0.91
1.29
1.76
1.50
2.17
1.73
1.19
1.00
0.790
1.23
1.00
0.866
0.630
0.575
1.41
1.15
1.00
2.50
2.0
3.163
3.87
4.47
5.60
7.90
6.33
0.55
0.46
0.39
0.32
0.27
0.22
0.71
0.60
0.50
0.40
0.36
0.32
0.29
0.27
0.25
0.22
1.00
0.845
0.707
0.575
0.500
0.445
2.450
2.070
1.735
1.415
1.225
1.000
3.00
3.46
4.47
3.54
3.16
2.52
2.12
1.73
1.50
1.22
2.45
2.00
1.73
2.00
1.41
1.69
0.612
0.707
0.865
0.775
1.06
1.22
2.11
1.41
0.866
0.655
1.00
1.24
1.83
0.500
0.575
2.39
0.375
0.470
0.19
0.17
0.316
0.408
0.15
0.12
0.19
0.16
0.267
0.222
0.316
0.433
0.388
0.500
0.447
0.750
0.548
0.567
0.866
1.00
0.655
0.817
0.10
0.13
0.182
0.250
0.316
0.365
0.447
0.500
0.578
0.086
0.10
0.155
0.224
0.274
0.316
0.433
0.346
0.500
0.447
0.414
0.387
0.346
0.707
0.071
0.090
0.129
0.176
0.224
0.258
0.387
0.358
0.288
0.577
0.194
0.055
0.046
0.039
0.070
0.060
0.050
0.041
0.035
0.031
0.029
0.100
0.084
0.070
0.058
0.050
0.041
0.035
0.032
0.141
0.119
0.173
0.224
0.259
0.200
0.224
0.182
0.336
0.300
0.500
0.447
0.633
0.100
0.079
0.070
0.058
0.050
0.045
0.041
0.035
0.032
0.123
0.100
0.087
0.141
0.115
0.100
0.141
0.122
= Standard values; check availability
Rheostats are silicone-ceramic coated at and
above the following ohmic values:
Model C: all
Model G: 5000Ω
Model E: 750Ω
Model K: 5000Ω
Model H: 2000Ω
Model L: 7500Ω
Model J: 5000Ω
Check product availability at
www.ohmite.com
RUS–––
RKS–––
RPS–––
RLS–––
Part No.
Prefix
Suffix
Amps max.
Amps max.
RJS–––
11.2
10.0
8.95
4.47
3.65
3.16
1.48
1.41
1.15
1.00
0.816
DIY/Open Source Hardware
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