Ohmite Mfg. Co. 1600 Golf Rd., Rolling Meadows, IL 60008 • 1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax 1-847-574-7522 • www.ohmite.com • info@ohmite.com 77
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, 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.
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
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 Max. 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 12.5 1.0-15K open 305 0.688/17.46 0.875/ 22.23 0.594/15.08 1-6 oz. in. 300°
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°
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°
C RCS/RCL 7.5 10.0-5K enclosed 305 0.875/22.23 0.515/ 13.08 — 0.25-3 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°
• Models H, J, G, and K also available in enclosed versions.
• See Catalog #203 for complete details.
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 82 for
knobs, dials, and
other hardware
Model C
ORDERING INFORMATION
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 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
*Check Table for
Standard
Resistance Values
and Maximum
Current Values
E = RoHS compliant
• 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.
78 Ohmite Mfg. Co. 1600 Golf Rd., Rolling Meadows, IL 60008 • 1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax 1-847-574-7522 • www.ohmite.com • info@ohmite.com
Ohmite Mfg. Co. 1600 Golf Rd., Rolling Meadows, IL 60008 • 1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax 1-847-574-7522 • www.ohmite.com • info@ohmite.com 79
STANDARD PART NUMBERS FOR RHEOSTATS
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
= Standard values; check availability
Rheostats are silicone-ceramic coated at and
above the following ohmic values:
Model C: all Model G: 5000Ω
Model E: 3500Ω Model K: 7500Ω
Model H: 7500Ω Model L: 7500Ω
Model J: 15,000Ω
Check product availability at
www.ohmite.com
