Rheostats
(Potentiometers) Wirewound
Model C
• 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°)
C RCS/RCL 7.5 10.0-5K
enclosed
305
0.875/22.23
0.515/ 13.08
—
0.25-3 oz. in. 300°
0.531"
13.49 mm
Locking
shaft
0.25"
6.4 mm
D
B
0.625"
0.625"
15.88 mm 15.88 mm
Mounting:
Panels
to 0.125" (3.18mm)
thick with
1
/
4
-32
bushing and hex
nut (
1
/
16
" thick).
0.125"
3.18 mm
0.25"
6.4 mm
0.25"
6.4 mm
0.109"
2.78 mm
Standard
shaft
Model e
• 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°
unenclosed
D
0.25"
6.35 mm
0.625"
15.88 mm
0.531"
shaft
13.49 mm
locking
nut
0.125"
3.18 mm
B
Mounting:
Panels to
0.125" (3.18mm) thick
with
1
/
4
-32 bushing and
hex nut (
1
/
16
" thick).
standard
shaft
0.25"
6.35 mm
enclosed
C
0.078"
1.98 mm
0.406"
10.32 mm
D
REL
locking
shaft
0.094"
2.38 mm
Dimensions for reference only; consult factory for details.
B
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.
1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax 1-847-574-7522 • www.ohmite.com • info@ohmite.com
187
Rheostats
(Potentiometers) Wirewound
Models H, J, G, K, l
• Models H, J, G, and K also available in enclosed versions.
• See Catalog #203 for complete details.
Ohmic
Model Type
Watts range
H RHS/RHL 25 1.0-25K
J
RJS
50 0.5-50K
G
RGS
75 0.5-50K
K
RKS
100 0.5-50K
L
RLS
150 0.5-50K
Core
open
open
open
open
open
Max.
Voltage Behind panel “B"
(RMS)* (in./mm Ref.)
500
1.375/34.93
750
1.375/34.93
900
1.750/44.45
1000
1.750/44.45
1200
2.000 / 50.8
0.375"
9.53 mm
Diameter “D" Dimension “C"
Shaft
Rotation
(in./mm Ref.) (in./mm Ref.)
torque
(±5°)
1.560/ 39.62 0.940/23.88 0.25-0.5 lb. in. 300°
2.31 / 58.67 1.56 /39.62 0.25-2 lb. in. 300°
2.75 / 69.25 1.78 /45.21 0.5-2 lb. in.
300°
3.125/ 79.38 1.91 /48.51 0.5-2 lb. in.
300°
4.00 /101.60 2.28 /57.91 0.5-3 lb. in.
300°
0.75"
19.05 mm
bushing
projection
0.625"
15.88 mm
1.75"
44.5 mm
D
0.5"
12.7 mm
drill 0.188" (4.76 mm)
hole in panel.
washer not included
in model L
holes for:
no. 2 screws (model H)
no. 8 screws (J, G, K, L) mounting
bracket on
model L only
0.031"
0.79 mm
0.25"
6.35 mm
0.031"
0.79 mm
0.344"
8.73 mm
0.875"
22.23 mm
0.063"
1.59 mm
B
C
shaft
locking
nut
locking shaft
(only model H
stocked)
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).
standard shaft
(models H, J, G, K, L)
M o d e l s P, N , R , U
• See Catalog #203 for complete details.
Model
P
N
R
U
Type
RPS
RNS
RRS
RUS
Watts
225
300
500
1000
Ohmic
range
1.0-30K
1.0-50K
1.0-20K
1.0-20K
Core
open
open
open
open
Max.
Voltage Behind panel “B"
(RMS)* (in./mm Ref.)
1300
2.125/53.98
1225
2.375/60.33
1450
2.125/53.98
1600
3.000 / 76.2
M
M
Diameter “D"
(in./mm Ref.)
5.00 /127.00
6.00 /152.40
8.00 /203.20
12.00 /304.80
Dimension “C"
(in./mm Ref.)
2.97 /75.44
3.44 /87.38
4.31/109.47
6.38/162.05
Shaft
Rotation
torque
(±5°)
2.5-4 lb. in.
310°
2.5-5 lb. in.
320°
4.5-7 lb. in.
325°
3.5-7 lb. in.
335°
2"
51 mm
B
P
N
R
U
Dimension “M"
0.875" 22.23 mm
1.188" 30.16 mm
1.5"
38.1 mm
3"
76.2 mm
Mounting:
Panels
to 1.25" (31.75mm)
thick with
1
/
4
-20
flat-head screws.
0.375"
9.53 mm
D
0.031"
0.79 mm
C
holes for
no. 8 screws
1
/
4
- 20 thread for
mounting screws
1.563"
39.7 mm
(continued)
188
1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax 1-847-574-7522 • www.ohmite.com • info@ohmite.com
Rheostats
(Potentiometers) Wirewound
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
o R d e R i N G i N f o R M at i o N
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
Series
Rheostats
Wirewound
Potentiometers
E = RoHS compliant
RCSR50E
• RoHS compliant product available. Add
“E" suffix to part number to specify.
• Made-to-order rheostats available:
Contact nearest Ohmite sales office.
*Check table for standard resistance
values and maximum current values
* Voltage rating dependent on resistance
value.
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.
Part No.
Prefix
Suffix
–––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
Amps max.
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
3.53
2.50
2.24
2.04
1.58
1.44
0.86
0.71
0.55
0.46
0.39
0.32
0.27
0.22
0.19
0.17
0.15
0.12
0.10
0.086
0.071
1.25
1.12
0.91
0.71
0.60
0.50
0.40
0.36
0.32
0.29
0.27
0.25
0.22
0.19
0.16
0.13
0.10
0.090
5.00
3.54
2.88
2.04
1.77
1.58
1.29
1.00
0.845
0.707
0.575
0.500
0.445
0.375
0.316
0.267
0.222
0.182
0.155
0.129
10.0
7.07
5.00
3.53
2.88
2.50
2.04
1.76
1.50
1.19
1.00
0.790
0.630
0.575
12.3
8.66
6.12
5.00
3.88
3.16
2.74
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
3.163
2.450
2.070
1.735
1.415
1.225
1.000
15.0
10.6
8.66
7.50
6.71
5.49
4.74
3.87
3.00
2.12
1.73
1.50
1.22
1.06
0.866
0.750
0.567
0.500
17.32
12.24
10.00
8.66
7.75
6.32
5.48
4.47
3.46
2.45
2.00
1.73
1.41
1.22
1.00
0.866
0.655
0.578
0.500
0.447
0.414
0.387
0.346
22.3
18.2
15.8
14.1
12.9
11.2
10.0
7.90
6.30
5.60
4.47
3.54
3.16
2.52
2.00
1.69
1.41
1.24
1.00
0.817
0.707
0.577
11.2
10.0
8.95
7.90
6.33
4.47
3.65
3.16
2.17
1.73
1.23
1.00
0.866
2.50
2.0
1.41
1.15
1.00
0.470
0.408
0.612
0.500
0.433
0.388
0.316
0.274
0.224
0.707
0.575
0.500
0.447
0.365
0.316
0.258
0.865
0.775
0.655
0.548
0.447
2.39
2.11
1.83
1.48
1.41
1.15
1.00
0.816
0.316
0.250
0.224
0.346
0.433
0.387
0.358
0.336
0.300
0.176
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
0.100
0.079
0.070
0.058
0.050
0.045
0.041
0.035
0.032
0.123
0.100
0.087
0.173
0.224
0.200
0.288
0.259
0.224
0.182
0.141
0.122
0.500
0.447
0.633
0.141
0.115
0.100
= 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
1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax 1-847-574-7522 • www.ohmite.com • info@ohmite.com
189
RUS–––
RKS–––
RPS–––
RLS–––
RJS–––
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