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Series RA20 And RA30 Wirewound Potentiometers

About RA20 And RA30 Type Wirewound Potentiometers

Tedss.com has the product knowledge and stock to be your one and only place to go for your RA20 and RA30 potentiometer needs. Please, don't forget about knobs you may need as well!

Looking for high quality American-made wire-wound potentiometers? The Clarostat series 43 meets MIL-R-19 standards. These 2 Watt wire-wound controls are made to the military specs RA20 series. These potentiometers run in ohmages from 1 ohm to 50K ohms. Taper is linear except when otherwise specifically noted. These wire-wound controls come in bushing both locking and non-locking. The typical locking shaft has 1/2 locking bushing with a 1/8 inch slotted shaft. You can get a 3/8 inch shaft beyond the locking bushing by using the number RA20LASD plus the ohmage code. The commercial 2 Watt locking series is designated by 43C2 or the military version RA20LASB. These two parts are 1/2 locking bushing and 1/8 shaft. When looking for a 2 Watt non-locking wire-wound potentiometer, you will look for Clarostat series 43C1 or 43C3 and MIL-R-19 RA20NASD series. The 43C3 or RA20NASD is a 3/8 inch bushing with a 1/2 inch shaft. The 43C1 series contains a 1 5/8 inch shaft, which can be cut down in size. These series are able to handle any 1/4 inch diameter knob.

American-made industrial wire-wound controls requiring 4 Watt power can be found by using the 58C series or the military RA30 series. The wire-wound controls come in linear taper. The ohmages run from 1ohm – 75Kohm in 10% tolerance. When looking for a locking shaft, please use designation RA30LASB or 58C2. If requiring a shaft longer than 1/8, please designate by using RA30LASD. When looking for a non-locking shaft, please use RA30NASD 1/2 inch shaft or 58C3. RA30NASA for 1/8 inch shaft 58C1 for 1 5/8 inch shaft (able to be cut down).

Clarostat 43C1, 43C2, 43C3, RA20LASB, RA20NASD, 58C1, 58C2, 58C3, RA30LASB, RA30NASD, can all be found at TEDSS.com

List of Popular RA20 and RA30 Wirewound Potentiometers Series.

Series NameManufacturerWattageShaftBushingPicture
RA20LASB potentiometer. RA20LASB series Clarostat 2 Watt 5/8 in. screwdriver slotted Locking 1/2 x 3/8 in. RA20LASB
RA20LASD potentiometer. RA20LASD series Clarostat 2 Watt 7/8 in. screwdriver slotted Locking 1/2 x 3/8 in. RA20LASD
RA20NASA potentiometer. RA20NASA series Clarostat 2 Watt 1/2 in. screwdriver slotted Standard 3/8 x 3/8 in. RA20NASA
RA20NASD potentiometer. RA20NASD series Clarostat 2 Watt 7/8 in. screwdriver slotted Standard 3/8 x 3/8 in. RA20NASD
RA20NASK potentiometer. RA20NASK series Clarostat 2 Watt 2 1/2 in. screwdriver slotted Standard 3/8 x 3/8 in. RA20NASK
RA30LASB potentiometer. RA30LASB series Clarostat 4 Watt 5/8 in. screwdriver slotted Locking 1/2 x 3/8 in. RA30LASB
RA30LASD potentiometer. RA30LASD series Clarostat 4 Watt 7/8 in. screwdriver slotted Locking 1/2 x 3/8 in. RA30LASD
RA30NASA potentiometer. RA30NASA series Clarostat 4 Watt 1/2 in. screwdriver slotted Standard 3/8 x 3/8 in. RA30NASA
RA30NASD potentiometer. RA30NASD series Clarostat 4 Watt 7/8 in. screwdriver slotted Standard 3/8 x 3/8 in. RA30NASA

List of Popular 43C and 58C Wirewound Potentiometers Series.

43C1 potentiometer. 43C1 series Clarostat 2 Watt 2 in. round. Standard 3/8 x 3/8 in. 43C1
43C2 potentiometer. 43C2 series Clarostat 2 Watt 5/8 in. screwdriver slotted Locking 1/2 x 3/8 in. 43C2
43C3 potentiometer. 43C3 series Clarostat 2 Watt 1/2 in. screwdriver slotted Standard 3/8 x 3/8 in. 43C3
58C1 potentiometer. 58C1 series Clarostat 4 Watt 2 in. round. Standard 3/8 x 3/8 in. 58C1
58C2 potentiometer. 58C2 series Clarostat 4 Watt 5/8 in. screwdriver slotted Locking 1/2 x 3/8 in. 58C2
58C3 potentiometer. 58C3 series Clarostat 4 Watt 1/2 in. screwdriver slotted Standard 3/8 x 3/8 in. 58C3

Wirewound Potentiometers Part Number Breakdowns.

RA20 and RA30 Series Part Number Breakdown Example:

RA20NASD103A
 
RA20 N A S D 10 3 A
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Series Bushing Switch Shaft Style Shaft Length Resistance First Two Digits Resistance Number of Zeros Linearity

Series Name:

  • RA20 Style Potentiometer
  • RA30 Style Potentiometer

Bushing:

  • N = Standard: 3/8 in. long x 3/8 x 32-NEF-2A
  • L = Locking: 1/2 in. long x 3/8 x 32-NEF-2A
  • S = Panel and shaft seal (Standard)
  • T = Panel and shaft seal (Locking)

Switch:

  • A = None
  • B = SPST 1A, 250V

Shaft Style:

  • S = Slotted
  • F = Flatted
  • X = Custom

Shaft Length:

  • A = 1/2 in.*
  • B = 5/8 in. ^
  • D = 7/8 in.
  • G = 1 1/4 in.
  • K = 2 1/2 in.*

* Not available in "L" locking bushing
^ Not available in "N" standard bushing

Linearity:

  • A = Linear
  • C = Log
  • E = Rev. Log

43C and 58C Series Part Number Breakdown Example:

58C1-40K
 
58C1 40K
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Series Resistance Value

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