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Rheostats
(Potentiometers) Wirewound
D
0.25"
6.35 mm
enclosed
unenclosed
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
REL
locking
shaft
Max.
Ohmic Voltage Behind panel “B" Diameter “D" Dimension “C" Shaft Rotation
Model Type Watts range Core (RMS)* (in./mm Ref.) (in./mm Ref.) (in./mm Ref.) torque (±5°)
C RCS/RCL 7.5 10.0-5K enclosed 305 0.875/22.23 0.515/ 13.08 — 0.25-3 oz. in. 300°
• See Catalog #203 for complete details.
Max.
Ohmic Voltage Behind panel “B" Diameter “D" Dimension “C" Shaft Rotation
Model Type Watts range Core (RMS)* (in./mm Ref.) (in./mm Ref.) (in./mm Ref.) torque (±5°)
E RES/REL 12.5 1.0-15K open 305 0.688/17.46 0.875/ 22.23 0.594/15.08 1-6 oz. in. 300°
E REE 12.5 1.0-15K enclosed 305 1.219/30.96 1.047/ 26.59 — 1-6 oz. in. 300°
• See Catalog #203 for complete details.
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 1
/4-32 bushing and
hex nut (1
/16" thick).
Mounting: Panels
to 0.125" (3.18mm)
thick with 1
/4-32
bushing and hex
nut (1
/16" thick).
MODEL C
MODEL E
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 File No. E-10946 and CSA File No. 21309 unless noted otherwise.
All rheostats are 10% tolerance.
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188
Mounting: Panels to
0.25" (6.35mm) thick
with 3
/8-32 bushing and
hex nut
(3
/32" thick) (or with 10-32
x 0.75 flat-head screws
for model L only).
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
1.75"
44.5 mm
D
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)
drill 0.188" (4.76 mm)
hole in panel.
washer not included
in model L
Rheostats
(Potentiometers) Wirewound
MODELS H, J, G, K, L
MODELS P, N, R, U
Max.
Ohmic Voltage Behind panel “B" Diameter “D" Dimension “C" Shaft Rotation
Model Type Watts range Core (RMS)* (in./mm Ref.) (in./mm Ref.) (in./mm Ref.) torque (±5°)
H RHS/RHL 25 1.0-25K open 500 1.375/34.93 1.560/ 39.62 0.940/23.88 0.25-0.5 lb. in. 300°
J RJS 50 0.5-50K open 750 1.375/34.93 2.31 / 58.67 1.56 /39.62 0.25-2 lb. in. 300°
G RGS 75 0.5-50K open 900 1.750/44.45 2.75 / 69.25 1.78 /45.21 0.5-2 lb. in. 300°
K RKS 100 0.5-50K open 1000 1.750/44.45 3.125/ 79.38 1.91 /48.51 0.5-2 lb. in. 300°
L RLS 150 0.5-50K open 1200 2.000 / 50.8 4.00 /101.60 2.28 /57.91 0.5-3 lb. in. 300°
• Models H, J, G, and K also available in enclosed versions.
• See Catalog #203 for complete details.
0.375"
9.53 mm
D
M M
1/
4 - 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
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 1
/4-20
flat-head screws.
Max.
Ohmic Voltage Behind panel “B" Diameter “D" Dimension “C" Shaft Rotation
Model Type Watts range Core (RMS)* (in./mm Ref.) (in./mm Ref.) (in./mm Ref.) torque (±5°)
P RPS 225 1.0-30K open 1300 2.125/53.98 5.00 /127.00 2.97 /75.44 2.5-4 lb. in. 310°
N RNS 300 1.0-50K open 1225 2.375/60.33 6.00 /152.40 3.44 /87.38 2.5-5 lb. in. 320°
R RRS 500 1.0-20K open 1450 2.125/53.98 8.00 /203.20 4.31/109.47 4.5-7 lb. in. 325°
U RUS 1000 1.0-20K open 1600 3.000 / 76.2 12.00 /304.80 6.38/162.05 3.5-7 lb. in. 335°
• See Catalog #203 for complete details.
(continued)
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= 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
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
Rheostats
(Potentiometers) Wirewound
ORDERING INFORMATION
• 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.
Series
Rheostats
Wirewound
Potentiometers
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
RCSR50E
Code Watts ModelShaft Core
CL= 7.5 C Locking Enclosed
CS= 7.5 CStandard Enclosed
EE = 12.5 E Standard Enclosed
EL = 12.5 E Locking Open
ES = 12.5 EStandard Open
GS =75GStandard Open
HL =25HLocking Open
HS =25HStandard Open
JS =50JStandard Open
KS = 100 KStandard Open
LS = 150 LStandard Open
NS = 300 NStandard Open
PS = 225 PStandard Open
RS = 500 RStandard Open
US = 1000 UStandard Open
E = RoHS compliant
*Check table for standard resistance
values and maximum current values
