Nidec Copal JC30S/JC40S Single-turn Wirewound Potentiometer

Precision wire winding technology has been used to achieve low noise and long life. Wirewound types include the single turn J series for use in servo drives


Potentiometers are displacement sensors that produce electrical output (voltage) in proportion to the mechanical displacement. They are basically composed of a resistor and a wiper (brush), with the mechanical displacement of the resistor relative to the wiper being accurately converted into electrical voltage output. A voltage is applied to both ends of the resistor, and the wiper is moved. The displacement is measured by the voltage between one terminal of the resistor and the wiper. Looking at the component structurally, we can see the following: (Fig. 1) Further, the following formulas apply to the voltage output



Nidec Potentiometer

Model of potentiometer

Wirewound Type

Precision wire winding technology has been used to achieve low noise and long life. Wirewound types include the single turn J series for use in servo drives and the multiturn M series for use in setting.

Conductive Plastic Type

Special film resistors and original contact construction provide long life, with degradation that is theoretically infinitely small. Conductive plastic types include single turn types and linear types, both for use in servo drives.

Cerment Type

The use of cermet resistors allows low price. The degradation is theoretically infinitely small. Cermet tyeps are single turn for use in servo drives and for setting.

Optical Contactless Type

Contactless configuration offers much longer life and lower noise compared with the conventional contact method.



Nidec Copal

Nidec Copal

NIDEC COPAL ELECTRONICS was established in April 1967 in Japan as a specialty manufacturer of electronics components. The company's philosophy remains unchanged - to be a supplier of high quality products while offering competitive prices. NIDEC COPAL ELECTRONICS began by developing a wirewound trimmer. This product was enthusiastically received by many sectors in the industry. The initial success of the trimmers laid the groundwork for future development of a wide selection of manufactured products that combined electronics at the start of the electronics revolution.

Later, robust sales of cermet trimmers led to the company's remarkable expansion. Further development efforts led to the release of a succession of new product lines. These included a wide range of motors, encoders, switches and pressure sensors.


  • Compact
  • Cost effective (JC22E) in house comparison
  • Long life
  • High following characteristics
  • High resolution (Essentially infinite)
  • RoHS compliant


Item Single turn
Nominal resistance value  Refer to LIST OF PART NUMBERS
Resistance torelance ± 15% ± 15%
Resolution Essentially infinite
Independent linearity ± 0.5% ± 0.3%
Effective electrical angle 343° ± 5° 345° ± 5°
Mechanical angle 360° continuous
Power rating (at 40 °C) 0.7W 1.5W
Dielectric strength 1000Vrms    1 min
Insulation resistance 1000MΩ minimum (at DC500 V)
Rotational torque 1.18 {12}mN·m {gf·cm} maximum 1.47 {15}mN·m {gf·cm} maximum
Temp. coefficient of resistance ± 400ppm/°C
Operating temp. range − 40 ~ 85°C
Maximum rotational speed 300 min-1 300 min-1
Rotational life (cycles) 30 million
Output smoothness 0.1 % maximum
Net weight Approx. 24g Approx. 56g
Protection grade IP40


Part Number Designation

JC30S 2K 1%

Series name

JC30S:Linear φ30mm
JC40S:Linear φ40mm

Nominal resistance value(Ω)

200, 500, 1 k, 2 k, 5 k, 10 k, 20 k

Independent linearity

0.3%:±0.3 %
0.5%:±0.5 %
1%:± 1%

List of Part Numbers

Part number Size Nominal resistance value Independent linearity
JC30S 500 0.5 % φ 30 mm 500 Ω ± 0.5 %
JC30S 1 k 0.5 % 1 kΩ
JC30S 2 k 0.5 % 2 kΩ
JC30S 5 k 0.5 % 5 kΩ
JC30S 10 k 0.5 % 10 kΩ
JC30S 20 k 0.5 % 20 kΩ
JC40S 500 0.3 % φ 40 mm 500 Ω ± 0.3 %
JC40S 1 k 0.3 % 1 kΩ
JC40S 2 k 0.3 % 2 kΩ
JC40S 5 k 0.3 % 5 kΩ
JC40S 10 k 0.3 % 10 kΩ
JC40S 20 k 0.3 % 20 kΩ

Additional Information

Rated Power Derating Curve




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