CTS 270 Technical Data

Commercial
Miniature 5/8"
(16mm) Diameter
Composition
Variable Resistors

• Miniature 5/8" (16mm) size

• Versatile mounting styles:
– bushing
– twist tab
– bend tab
– snap-in PC bracket
– solder lug or PC terminals

(shaft parallel or perpendicular to the panel)

• 100 Ω to 5 Meg Ω resistance range

• Molded or metal shafts

• SPST power switches

• Single, tandem, or concentric units

• Panel seal

• Rear extended shaft

Series 270

Technical Data Sheet 1448C

CTS CORPORATION / MANUFACTURER OF RELIABLE ELECTRONIC COMPONENTS

Electrical and Mechanical Specifications

Resistance Range

100 Ω through 5 Meg Ω (linear taper).

Resistance Tolerance

Standard: ±20%
Special: Other tolerances available in most

resistance values.

Power Rating, Watts

1

/4 watt per section through 100K

1

/5 watt per section above 100K

Full rating @ 55°C derated to no load at 85°C,

linear taper, bushing mounted control on steel panel
4" x 4" x .050" (101.6mm x 101.6mm x 1.27mm).
(Derating required on two section controls.)

Voltage Rating

Bushings to Terminals:

High pot test, one minute — 750 VAC
Operating maximum — 500 VDC

Across End Terminals:

350 VDC, load not to exceed listed wattage ratings.

Resistance Tapers

Standard: Linear, 10% Audio and 10% CCW Audio
Special tapers available to meet most requirements

Angle of Rotation

Total Rotation

Without Switch: 300° ± 5°
With Switch: 315° ± 5°

Effective Rotation

Without Switch: 300° (approximate)
With Switch: 290° (approximate)

Panel Mounting Information

Bushing Mount

Standard: Brass

(continued on next page)

Technical Data Sheet 1270E

查询270T820A103A1A1供应商

®

Electrical and Mechanical Specifications (continued)

All Other Mounts

Standard: Twist tab (designated by “1”)
Special: Bend tab — 2 or 3 ears

Bracket mounted

Suggested Panel for Twist Tab

.042" thick (1.07mm)

Locating Lugs (Bushing Mount)

Standard: .312" (7.9mm) radius from center of control.
Special: .375" (9.53mm) radius from center of control.
Standard Position: Left side supplied unless otherwise

specified.

Other Positions: Available with lug right side,

without lugs, or with lugs both
left and right sides.

Water Seal Construction

Controls are also available to prevent water

from entering the control through either the
O.D. of shaft and/or the bushing.

Shaft and Bushing Information

Bushing Lengths Available

Standard: .187" or .250" (4.75mm or 6.35mm)
Special: .125" increments (3.2mm increments)

Thread Size

Standard:

1

/4" – 32

3

/8

" – 32
M7 x .75
M8 x .75P

Special: As required

Molded Shafts Available

(Shown with preferred diameter bushing)

Bushing Mounted or Ear Mounted

Metal Shafts Available

(Shown with preferred diameter bushing)

Single or Dual Units

Concentric Tandem Units

Available in two combinations:

A – .125" (3.2mm) diameter rear shaft

.250" (6.35mm) panel shaft

(3/8 – 32 or M9X.75)

B – .156" (4.0mm) diameter rear shaft

.236" (6.0mm) diameter panel shaft

(3/8 – 32 or M8X.75)

Most metal shaft diameters can be used with
twist tab mountings. With bracket mount,
only .187 diameter shafts are used, with turn-down
available to obtain smaller diameters.

Metal

Lengths: Minimum .125" (3.2mm) beyond bushing;

special lengths as required.

Trims: Plain round screwdriver slotted, flatted,

knurled. Other trims available
upon request.

Molded

Flatted and knurled with screwdriver slot available

in many lengths and diameters.

Terminal Information

Standard: T Solder lug formed 90° to the rear.
Special: (See below)

T: Solder lug perpendicular to shaft.

T: Solder lug formed 60° to the rear.

U: PC terminals formed 90° forward toward

mounting surface. Terminals extend .187"
(4.7mm) beyond mounting surface.

V: PC terminals formed 90° to the rear, away

from panel mounting. Terminals extend .520"
(13.2mm) from mounting surface.

W: Wire wrap terminals — .156" (4.0mm) terminal

extension beyond base, formed 60° to the rear.

BX: PC terminals standard .438" (11.1mm) from

center line of control to PC board; straight
terminals extend .156" (4.0mm) into PC board.

X: PC terminals standard .505" (12.8mm) from

center line of control to PC board, with .136"
(3.4mm) straight terminal extension beyond
PC board standoff.

Y: PC terminals standard .602" (15.3mm) from

centerline of control to PC board, with .140"
(3.5mm) straight terminal extension beyond
PC board standoff.

(continued on next page)

SHAFT DIAMETER BUSHING DIAMETER

INCH MM INCH MM

.156 4.0 1/4" – 32 M7X.75
.187 4.7 — M7X.75
.236 6.0 3/8" – 32 M8X.75
.250 6.35 3/8" – 32 M9X.75

SHAFT DIAMETER BUSHING DIAMETER

INCH MM INCH MM

.125 3.2 1/4" – 32 M7X.75
.156 4.0 1/4" – 32 M7X.75
.187 4.7 3/8" – 32 M7X.75
.236 6.0 3/8" – 32 M8X.75
.250 6.35 3/8" – 32 M9X.75

Power Switches Available (all SPST)

Electrical and Mechanical Specifications (continued)

ELECTRICAL

SERIES TYPE RATING

057 Rotary 5A @ 20 VDC

057 Rotary 3A @ 125 VAC

(UL approved)

DIMENSION:

MM

INCH

DIMENSION:

MM

INCH

ELECTRICAL

SERIES TYPE RATING

DEMI Push-Pull 3A @ 20 VDC

DEMI Momentary contact 3A @ 20 VDC

Push on

Switch Actuating Angle -25˚
Switch Actuating Torque - 2 to 10 in. oz.

(144 to 720g-cm)

DIMENSION:

MM

INCH

DIMENSION:

MM

INCH

DIMENSION:

MM

INCH

DIMENSION:

MM

INCH

T270 Solder Lug Terminals, Metal Shaft, Bushing Mount

BX PM270 PC Type Base “X” Terminals, 2-Ear Mount Bend Tab, Molded Shaft

UPE 270RE PC Type “U” Terminals, Twist Tab Mount, Metal Shaft, Rear Extension

XB275RE PC Type “X” Terminals, Metal Shaft, Rear Extension

DIMENSION:

MM

INCH

DIMENSION:

MM

INCH

DIMENSION:

MM

INCH

DIMENSION:

MM

INCH

VPE 270 PC Type “V” Terminals, Twist Tab Mount, Metal Shaft

X057-BX270 PC Type Terminal SPST Switch, PC Style Base “X” Terminals, Metal Shaft, Bushing Mount

T2-270 Solder Lug Terminals, Straight Tandem, Metal Shaft, Bushing Mount

XP275 PC Type “X” Terminal, Metal Shaft, Twist Tab Mounting

MOUNTING STYLE

BUSHING LENGTH:

1/8" (3.2MM)

INCREMENTS

EXAMPLES:
2 – .250" (6.35MM)
3 – .375" (9.5MM)
8 – 1.000" (25.4MM)
1 – TWIST TAB MOUNT

BUSHING MOUNT SUPPLIED

WITH LOCATING LUG

LEFT SIDE TERMINALS DOWN

SHAFT LENGTH

From Mounting Surface

1/32" (0.8mm) Increments

Examples:

Metal Shafts

20 – .625" (15.9MM)
24 – .750" (19.1MM)
28 – .875" (22.2MM)
32 – 1.000" (25.4MM)

Moulded Shafts

Limited Lengths Available,

See Shaft Trim selection

16 – Shaft U,.500" (12.7MM)
28 – Shaft V,.875" (22.2MM)
32 – Shaft W,.1.0" (25MM)

TERMINAL STYLE

T – SOLDER LUG
X – PC*
U – FORMED

TO FRONT

V – FORMED

TO REAR

W– FORMED

TO REAR

Order From:

CTS CORPORATION, RESISTOR/ELECTROCOMPONENTS / 1601 Mishawaka Street / Elkhart, Indiana 46514
North America Toll Free [phone] / [phone] / FAX: [phone] 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
[phone] / FAX: [phone].8110040

03/00I

Ordering Information

270/275 T 2 20 R 103 B 1 A 1

RESIST TOL

A – ±10%
B – ±20%
C – ±30%

SWITCH TYPE

A – NONE
B – SPST ROTARY

SHAFT TRIM

A – .125" DIAM. ROUND BRASS
B – .125" DIAM. FLAT BRASS
C – .125" DIAM. SD SLOT BRASS
R – .156" DIAM. ROUND BRASS
F – .156" DIAM. FLAT BRASS
S – .156" DIAM. SD SLOT BRASS
G – .187" DIAM. ROUND BRASS
H – .187" DIAM. FLAT BRASS
J – .187" DIAM. SD SLOT BRASS
X – .236" DIAM. ROUND BRASS
L – .236" DIAM. FLAT BRASS
M– .236" DIAM. SD SLOT BRASS
N – .236" DIAM. SK BRASS
P – .250" DIAM. ROUND BRASS
D – .250" DIAM. FLAT BRASS
E – .250" DIAM. SD SLOT BRASS
T – .250" DIAM. SK BRASS
U – .187" DIAM. .500" FMS SK MOLDED
V – .187" DIAM. .875" FMS FLAT MOLDED
W– .236" DIAM. .984" FMS FLATTED

(.472" X .177") MOLDED

K – .236" DIAM. .500" FMS SK MOLDED

(SWITCH ONLY)

TAPER

1 – LINEAR
2 – 10% AUD
3 – 10% CCW

AUD

SPECIALS

1 – NONE
2 – 50% DETENT
4 – LOCATING LUG

FOR RIGHT SIDE

5 – NO LOCATING LUG

RESISTANCE CODE

EXAMPLES

CODE RESISTANCE

501 500 OHMS
102 1K
252 2.5K
502 5K
103 10K
253 25K
503 50K
104 100K

*BX construction and terminal length

supplied unless otherwise specified

DIMENSION:

MM

INCH

T057-C2-270 Solder Lug Terminal SPST Switch, Solder Lug Terminals, Concentric Metal Shafts, Bushing Mount

NOTES: 275 series available in “X” and “U” style PC

Terminals only.
.125” dia. & .156” dia. shaft thickness is .109”.
.187” dia. shaft flat thickness is .156”.
.236” dia. shaft flat thickness is .177”.
.250” dia. shaft flat thickness is .156”.