RA20
Series
TOCOS
PA N E L C O N T R O L S
®
20mm Diameter, Single-Turn, Wirewound Industrial Panel Controls
RA20Y
RA20YP2
Features
20mm diameter, single-turn industrial panel controls
Wirewound element
Linear or audio tapers
Single or tandem units, single shaft
Metal shaft and bushing
Panel and PCB mounting styles
Shaft lock available
6mm diameter shafts in slot, flat or round end styles
Standard 10mm or 15mm shaft length
Lug or right angle mount pin terminals
Low operating temperature option of 10 C or 30 C, up to 100 C
Specifications
Electrical
Standard Resistance Range
. . . . . . . . . . . B = 10Ω to 20kΩ
A,C= 100Ω to 3kΩ
Resistance Tolerance
. . . . . . . . . . . . . . . . . 10% standard
( 5%, 2% or 1% special order )
End Resistance
. . . . . . . . . . . . . . . . . . R
!
500Ω = 1Ω max.
R
0
500Ω = 0.2% max.
Resistance Taper
. . . . B = linear; A = CW audio (logarithm);
C = CCW audio (logarithm)
Power Rating
. . . . . . . . B = 1 watt; A,C = 0.5 watt, at 40 C
Insulation Resistance
. . . . . . . 100MΩ minimum at 500VDC
Dielectric Strength
. . . . . . . . . . . . . . . . . . 500VAC, 1 minute
Theoretical Resolution
Resistance (
Ω
)
10
20
50
100
200
500
Resolution ( % )
0.62
1.12
0.78
0.62
0.46
0.38
Resistance (
Ω
)
1,000
2,000
5,000
10,000
20,000
–
Resolution ( % )
0.44
0.35
0.25
0.18
0.14
–
Environmental
Temperature Range
. . . . . . . . . . . . . . Y =
or X =
10 C to
30 C to
100 C
100 C
Temperature Characteristics
. . . . . . . . . . .
85 C, 5 hours
without load
∆T/R
)
5%
Low Temperature Exposure
. . . . . . .
10 C ( Y ), 30 C ( X )
1 hour without load
∆T/R
)
3%
Load Life
. . . . . . . . . . . .
40 C, 1,000 hours with rated load
∆T/R
)
3%
Moisture and Load Life
. . . . . . . . . . . . 40 C, 90-95%RH,
500 hours with 1/10 rated load
∆T/R
)
5%
Vibration
. . . . . . . . . . . . . . . . . . .10-55Hz, 1.5mm amplitude,
2 directions, 2 hours each
∆T/R
)
1%
Soldering Heat Resistance
. . . . . . . . . 350 C, 3.5 seconds;
260 C, 5 seconds (PCB units)
∆T/R
)
2%
Rotational Life
. . . . 15,000 cycles (500 cycles for shaft lock
models only) with 1/2 rated load
∆T/R
)
3%
R = Total Resistance Value;
∆T/R
= Total Resistance Change
Mechanical
Mechanical Travel
. . . . . . . . . . . . . . . . . . . . . . . . . . 290 5
Shaft Torque
Single Unit . . . . . 30.6 to 204 gf
•
cm (0.424 to 2.828 oz
•
in)
Tandem Unit . . . . . 71.2 to 510 gf
•
cm (0.987 to 7.07 oz
•
in)
Stop Strength
. . . . . . . . . . . 6.12 kgf
•
cm (84.84 oz
•
in) max.
Mounting Nut Torque
. . . . . . 15 kgf
•
cm (207.94 oz
•
in) max.
Solderability
. . . . . . . . . . . . . . . . . . . . . . . 235 C, 3 seconds
Marking
. . . . . . . . . . . . . Model type, taper, resistance code,
shaft type, terminal identification, date code
TOCOS
AMERICA, INC.
1177 East Tower Road, Schaumburg, IL 60173
Tel: 847-884-6664
Fax: 847-884-6665
E-mail: sales@tocos.com
www.tocos.com
53
RA20 Series
RA20Y & RA20X
Panel Mount, Single Unit, Single Shaft
Right Angle Ear-Lug Terminals
Dimensions
Unit: mm
Recommended
Panel Mounting Hole
RA20YL & RA20XL
Panel Mount, Single Unit, Single Shaft with Shaft Lock
Right Angle Ear-Lug Terminals
Recommended
Panel Mounting Hole
RA20YP2
PCB Mount, Single Unit, Single Shaft
Right Angle Mount Pin Terminals, 3-Pin Inline Pattern, 2-Pin Standoff Rear Support Bracket
Recommended
PCB Mounting Holes
54
1177 East Tower Road, Schaumburg, IL 60173
TOCOS
AMERICA, INC.
Tel: 847-884-6664
Fax: 847-884-6665
E-mail: sales@tocos.com
www.tocos.com
RA20 Series
RA 20 Y L 10 S B 203 K
Part Numbering System
NOTE: FMS = From Mounting Surface
Resistance Tolerance: K
J
G
F
=
=
=
=
10% (standard).
5% (special order ).
2% (special order ).
1% (special order ).
Resistance Code:
Expressed in ohms. A three digit code where the first
two digits are significant figures, and the third digit indicates the number
of zeros that follow these figures (i.e., 200 = 20Ω; 201 = 200Ω; 202 = 2,000Ω;
203 = 20,000Ω ).
See table for standard resistance values.
For Single Unit:
Specify taper and resistance code as shown.
For Ganged Tandem Unit:
Specify a taper code and resistance code for each unit starting with
the front unit followed by the rear unit. If both units have the same taper
and resistance codes, add “X2” suffix per example below.
Examples:
B203A503
or if both units are the same:
B203X2
Resistance Taper: B
= Linear.
A
= CW Audio (logarithm).
C
= CCW Audio (logarithm).
Shaft End Style: S
= Slotted.
F
= Flatted.
R
= Round.
Standard Shaft Length: 10
= 10mm FMS.
15
= 15mm FMS.
Up to 30mm shaft length available (special order ).
Style: Blank
= Panel Mount, Single Unit, Single Shaft, Right Angle
Ear-Lug Terminals.
L
= Panel Mount, Single Unit, Single Shaft with Shaft Lock,
Right Angle Ear-Lug Terminals.
P2
= PCB Mount, Single Unit, Single Shaft, Right Angle
Mount Pin Terminals, 3-Pin Inline Pattern, 2-Pin Rear
Support Bracket.
G
= Panel Mount, Ganged Tandem Unit, Single Shaft,
Right Angle Ear-Lug Terminals on Each Unit.
Operating Temperature Range: Y
=
X
=
Size: 20
= 20mm Diameter.
TOCOS Series Name: RA
= Wirewound Element.
10 C to 100 C.
30 C to 100 C.
Standard Resistance Values and Part Numbering Codes
Standard Nominal Total Resistance Values and Part Numbering Codes
Resistance (
Ω
)
10
20
50
Code
100
200
500
Resistance (
Ω
)
100
200
500
Code
101
201
501
Resistance (
Ω
)
1,000
2,000
5,000
Code
102
202
502
Resistance (
Ω
)
10,000
20,000
Code
103
203
Refer to Shaft End Styles Specifications and Hardware Specifications for details and availability.
For additional information, refer to Guidelines and Precautions for Using Panel Controls.
56
1177 East Tower Road, Schaumburg, IL 60173
TOCOS
AMERICA, INC.
Tel: 847-884-6664
Fax: 847-884-6665
E-mail: sales@tocos.com
www.tocos.com
Switching Power Supply Study Group
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