Series 118
®
Commercial 3/4"
(19.1mm) Diameter,
2-Watt, Wirewound
Variable Resisters
Features
• Fully enclosed construction
• Long rotation life
• Optional grounded or insulated rotor
construction
• Incorporated fixed resistor available
• Available with nylon shaft
• Bushing mounting style
• RoHS compliant
Electrical and Mechanical Specifications
Resistance Range
1 ohm through 20,000 ohms (linear taper)
Resistance Tolerance
Standard: ±20%
Special: ±10%
Power Rating, Watts
2 watts @ 55°C derated to no load @ 105°C,
linear taper, bushing mounted control on
steel panel 4"x4" x .050"
(101.6mm x 101.6mm x 1.27mm).
Voltage Rating
Terminals to mounting surface (insulated types only):
High pot test, one minute — 900 VAC
Operating Maximum — 500 VDC
Across end terminals:
Determined by resistance value and
wattage rating
Resistance Tapers
Standard: Linear
Taps Available
None
Incorporated Fixed Resistor
A fixed resistor can be incorporated at the end
of CW or CCW rotation to a minimum of 15% of
the total resistance value. The rotation is
shortened by an amount proportional to the ratio
of the fixed resistor to the total resistance value.
Angle of Rotation
Total Rotation: 270° ± 5°
Rotational Torque
Turning Torque: 1/2 to 10 in-oz. (36-720 gf-cm)
Stop Strength
4 in-oz. (4.61 Kgf-cm)
1-2
CTS Electronic Components
© 2006 CTS Corporation. All rights reserved. Information subject to change.
9/30/06
www.ctscorp.com
Electrical and Mechanical Specifications
Terminal Information
Insulated Construction (Standard)
The contactor is insulated from the base and
connected to the center terminal on the insulated
construction. This construction can be supplied
with the center terminal and one end terminal at
either end of the resistance element or with the
center terminal and terminals at both ends of the
resistance element.
Grounded Construction (Optional)
The grounded construction is supplied without a
center terminal and the contactor is connected to
the case. This construction can be furnished with
one end terminal at either end of the resistance
element or with terminals at both ends of the
element.
Bushing Information
Standard: 3/8"-32 UNEF-2A thread, .375" (9.53mm)
or .250" (6.35mm) long. M9 x 0.75
available.
Special: As required in increments of 1/16" (1.58mm)
Locating Lugs
Standard Position: Left side (with terminals down)
supplied, unless otherwise
specified.
Other Positions:
Available with right side only, both
left and right, or without lugs.
CTS SERIES TYPE 118
CLEARANCE HOLE FOR 3/8-32 THREADED BUSHING
CENTER TERMINAL SUPPLIED WITH INSULATED CONTACT ARM CONSTRUCTION.
OMITTED ON GROUNDED CONTACT ARM CONSTRUCTION.
1.57
.062
3.96
.156
9.4±0.05
.370±.002
1.52
.060
10.41
.410
10.41
.410
1.57
.062
2.08
.082
4.16±0.05
.164±.002
45°
END C.W
45°
END C.C.W
ROT.
OPTIONAL PC TERMINAL POSTION
PERPENDICULAR TO MFG. SURFACE.
7.14
.281
1.4
.055
2.79±0.05
.110±.002
40°
40°
7.95
.313
3/8-32 UNEF-2A
TERMINLS 1.98/.078
WIDE X 0.40/.016
270°
ROT.
6.35
.250
6.35
.250
19.84
.781
11.13
.438
LOCATING LUG
2.03±0.38
.080±.015
ABOVE MFG SURFACE
A±
0.4
L±
0.8
.031
.016
11.13
.438
1.60
.063
DIMENSION:
mm
INCH
Ordering Information
118
G
A
3
LOCATING
LUG
1 –
LEFT
2 –
RIGHT
3 –
NONE
32
R
SHAFT TRIM
R –
ROUND
F –
FLATTED
K –
KNURLED
103
B
1
A–
±10%
B–
±20%
D–
± 5%
TAPER
1
– LINEAR
RESIST TOLERANCE
TERMINAL STYLE
J –
INSULATED
CONSTRUCTION
G –GROUNDED
CONSTRUCTION
MOUNTING STYLE BUSHING
A
– 1/4" (6.35mm) LONG
B
– 3/8" (9.53mm) LONG
RESISTANCE CODE
SHAFT LENGTH
118 SERIES ONLY
FROM MOUNTING SURFACE
1/32" INCREMENTS
20
– .625" (15.9mm)
24
– .750" (19.1mm)
28
– .875" (22.2mm)
32
– 1.000" (25.4mm)
CODE RESISTANCE
5A0
5 OHMS
500
50
101
100
501
500
102
1K
252
2.5K
502
5K
103
10K
203
20K
Metric bushings available. Consult CTS.
2-2
CTS Electronic Components
© 2006 CTS Corporation. All rights reserved. Information subject to change.
9/30/06
www.ctscorp.com
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