SP Series Carbon Film Single-Turn Potentiometers
Carbon film single-turn potentiometer with 29mm housing diameter, designed for DC and AC current circuits in special equipment
Operating temperature range −65°C to +100°C with relative humidity tolerance of 95 to 98% at up to +40°C
Barometric pressure operating range 6.7 to 1040 hPa (5 to 780 mmHg)
Power rating minimum 1W at 70°C, derating to zero at 125°C
Resistance 10kΩ (E6 series), linear taper (A); tolerance ±10% on request
Independent linearity ±5%
Mechanical angle 255° ±5°; electrical angle within 30° of mechanical angle
Running torque 2 to 6 Ncm across full rotation range
Stop strength ≥50 Ncm
Rotational life 15,000 rotations
Dielectric withstanding voltage minimum 1000V AC; insulation resistance minimum 1GΩ
IP54 ingress protection rating
RoHS 2 compliant
6mm shaft diameter; shaft lengths of 16mm, 20mm, or 25mm from mounting surface; bushing length ≤9mm
Terminals: solder lugs; anti-rotation secured by two lug pins
What are the SP Series Carbon Film Single-Turn Potentiometers?
The SP series is a carbon film single-turn potentiometer in a 29mm housing, engineered specifically for use in special equipment operating in demanding environmental conditions including extreme temperature ranges, high humidity, and wide barometric pressure variation. Where standard panel potentiometers are designed for benign indoor environments, the SP is intended for deployment in industrial, military, aerospace, and field instrumentation applications where ambient conditions cannot be controlled and the potentiometer must continue to perform reliably under sustained environmental stress.
The carbon film resistive element is housed within a 29mm body and operated by a 6mm metal shaft through a 255° ±5° mechanical rotation arc, with the electrically active portion of the track falling within 30° of the full mechanical angle. The running torque of 2 to 6 Ncm is maintained consistently across the full rotation range, providing a controlled, deliberate feel that resists accidental displacement in vibrating or shock-exposed environments. The stop strength of at least 50 Ncm ensures that the end stops withstand rough handling without mechanical failure. Shaft lengths of 16mm, 20mm, and 25mm from the mounting surface are available, with a bushing length not exceeding 9mm, accommodating a range of panel thicknesses and knob fitment configurations.
The SP is rated at a minimum of 1W power dissipation at 70°C, derating linearly to zero at 125°C, making it suitable for circuits carrying meaningful signal power as well as pure voltage reference functions. The dielectric withstanding voltage of at least 1000V AC and insulation resistance of at least 1GΩ confirm suitability for high-voltage-referenced and electrically isolated control circuits. The IP54 ingress protection rating provides dust exclusion and splash resistance, supporting deployment in environments where particulate contamination and moisture ingress are realistic hazards.
The resistance value is fixed at 10kΩ in the E6 series with a linear (A) taper characteristic, and a tolerance of ±10% is available on request. Independent linearity is specified at ±5%, defining how closely the actual output tracks the ideal linear relationship between shaft position and resistance, a parameter of particular importance in analogue control and feedback applications where positional accuracy translates directly to control precision. The rotational life of 15,000 cycles reflects the SP’s role as a setting and calibration control rather than a continuously operated user interface. Terminals are solder lug type, suited to cable attachment in panel-wiring and field-installation environments, and the potentiometer is secured against rotation by two anti-rotation lug pins. The SP series is RoHS 2 compliant.
SP Series Carbon Film Single-Turn Potentiometers Specifications
A practical overview for engineers and procurement teams evaluating resistive solutions.
Model: SP
Resistor type: Variable
Description: 29mm, carbon single turn potentiometer
Power Rating: 1W
Resistance (Ω): 10kR (E6)
Tolerance (%): ±10
Applications of the SP Series Carbon Film Single-Turn Potentiometers
Where RARA variable resistors are deployed in the field.
Military and defence equipment — control and calibration potentiometers in systems requiring operation across extreme temperature and pressure ranges
Aerospace and avionics instrumentation — setpoint and reference adjustment in equipment subjected to wide altitude-related pressure variation
Industrial field instrumentation — analogue setpoint control in outdoor and harsh-environment process monitoring equipment
Marine and shipboard electronics — control adjustment in equipment exposed to high humidity and salt-laden atmospheres
Railway and rolling stock control systems — driver interface and setpoint adjustment controls in traction and auxiliary power equipment
High-voltage control circuits — reference and divider adjustment where 1000V AC dielectric withstanding voltage is required
Power conversion and DC drive systems — speed reference and current limit adjustment in systems requiring splash-resistant panel controls
Test and measurement equipment — calibration and range adjustment in field-deployed instrumentation
Oil, gas, and petrochemical plant control — setpoint adjustment in control panels subject to dust, humidity, and temperature extremes
General-purpose special equipment — wherever a carbon film single-turn potentiometer with IP54 protection, 1000V dielectric strength, and −65°C to +100°C operating range is required
Related Products of the SP Series Carbon Film Single-Turn Potentiometers
Model: DOW
Resistor type: Variable
Description: Wire wound potentiometer
Power Rating: 4W
Resistance (Ω): 22~47k
Tolerance (%): ±2, ±5
Model: DG
Resistor type: Variable
Description: Wire wound potentiometer
Power Rating: 2W
Resistance (Ω): 22~3.3k
Tolerance (%): ±5, ±10
Model: BC1
Resistor type: Variable
Description: Variable power rheostat
Power Rating: 12.5W~150W
Resistance (Ω): 0.5~5.1k
Tolerance (%): ±5, ±10
TCR (ppm/C): 200~400
Model: BSR/BSQ
Resistor type: Variable
Description: Slide type variable power resistor
Power Rating: 200W~2000W
Resistance (Ω): 0.5~200 max.
Tolerance (%): ±10
Why Choose RARA Variable Resistors
What sets RARA apart for engineers and procurement managers in industrial and automotive markets.
01
Full Spectrum Coverage
From 0.1W carbon signal potentiometers to 3000W industrial wire wound rheostats — RARA covers the complete variable resistor spectrum from a single ISO 9001 certified supplier.
02
Hermetic Sealed Options
PC-199 and CW-18 hermetically sealed cermet models resist moisture, dust, and contamination — extending service life in outdoor, marine, and industrial environments where standard potentiometers degrade rapidly.
03
Precision Wire Wound
DM, DOW, and DG precision wire wound potentiometers deliver the accuracy and repeatability needed for calibration, instrumentation, and closed-loop feedback applications.
04
Global Track Record
Trusted by Siemens, Rockwell, Schneider Electric, and Hanwha — deployed in industrial control and power regulation systems across six continents.
