Series 118
®
Commercial 3/4”
(19.1mm) Diameter,
2-Watt, Wirewound
Variable Resisters
• Fully enclosed construction
• Long rotation life
• Optional grounded or insulated rotor
construction
• Incorporated fixed resistor available
• Available with nylon shaft
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
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 inch-ounces (36-720 g-cm)
Stop Strength: 4 inch-pounds (4.61 Kg-cm)
Technical Data Sheet 1448C
Technical Data Sheet 1118
CTS CORPORATION /
MANUFACTURER OF RELIABLE ELECTRONIC COMPONENTS
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 NEF-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.
DIMENSION:
MM
INCH
Ordering Information
118
SERIES
MOUNTING
DESIGNATION
118
–BUSHING
TERMINAL STYLE
J –
INSULATED
CONSTRUCTION
G –
GROUNDED
CONSTRUCTION
MOUNTING STYLE BUSHING
A
– 1/4” (6.35mm) X 3/8”-32
B
– 3/8” (9.53mm) X 3/8”-32
Metric bushings available. Consult CTS.
G
A
3
LOCATING
LUG
1 –
LEFT
2 –
RIGHT
3 –
NONE
32
R
SHAFT TRIM
R –
ROUND
F –
FLATTED
K –
KNURLED
103
B
1
TAPER
1
– LINEAR
RESIST TOLERANCE
A
– ±10%
B
– ±20%
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
100
10 OHMS
500
50
101
100
501
500
102
1K
252
2.5K
502
5K
103
10K
203
20K
Order From:
CTS CORPORATION, ELECTROCOMPONENTS
/ 1601 Mishawaka Street / Elkhart, Indiana 46514
North America Toll Free (888) 287-4690 / (219) 296-6700 / FAX: (219) 293-1240 http://www.ctscorp.com
CTS COMPONENTS TAIWAN, LTD.
/ 7, Central 6th Road (Chung Liu Road) / P.O. Box 26-20
Kaohsiung Export Processing Zone / Kaohsiung, Taiwan, Rep. of China
(07) 8216145 / FAX: (07) 8417642.8110040
5M-4-99I
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