Adjustable Resistors

Adjustable resistors, also known as potentiometers, allow a degree of control over the resistance within a circuit. This gives them an advantage over other types of fixed resistor, depending on your needs.
They are composed of a fixed resistive element, and a slider that is able to pass along the element. This is what changes the resistance of the circuit, and it is usually controlled externally.

What are adjustable resistors used for?
Adjustable resistors are most commonly used for volume control in TV and radio. They can also be used as part of a light dimmer, to indirectly affect the level of light.

Types of adjustable resistor
Adjustable resistors largely vary based on material:

  • Wirewound adjustable resistors use a coil of resistance wire, and offer the highest performance.
  • Cermet adjustable resistors are composed of ceramic and metal. They can withstand high temperatures, and are often used in trimmer resistors.
  • Carbon composition adjustable resistors are some of the most common types used, as they are a good all-purpose resistor.
  • Conductive plastic adjustable resistors use conductive plastic ink, and have a low noise output.

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Description Price Resistance Tolerance Power Rating Temperature Coefficient Termination Style Package/Case Technology Mounting Style Case Style Series Dimensions Diameter Length Maximum Operating Temperature
RS Stock No. 893-0902
Mfr. Part No.E300K16RE
BrandOhmite
MYR155.05
Each
units
16 Ω ±10% 300W ±400ppm/°C - - - Bolt On, Bracket Vitreous Enamel E300 28.58 x 215.9mm 28.58mm 215.9mm +400°C
RS Stock No. 892-5746
Mfr. Part No.D25K150E
BrandOhmite
MYR63.31
Each
units
150 Ω ±10% 25W ±260ppm/°C - - - Bolt On, Bracket Vitreous Enamel D25 14.3 x 50.8mm 14.3mm 50.8mm +350°C
RS Stock No. 892-4894
Mfr. Part No.D25K2K5E
BrandOhmite
MYR65.48
Each
units
2.5 kΩ ±10% 25W ±260ppm/°C - - - Bolt On, Bracket Vitreous Enamel D25 14.3 x 50.8mm 14.3mm 50.8mm +350°C
RS Stock No. 892-4853
Mfr. Part No.D225K50RE
BrandOhmite
MYR169.65
Each
units
50 Ω ±10% 225W ±260ppm/°C - - - Bolt On, Bracket Vitreous Enamel D225 28.6 x 266.7mm 28.6mm 266.7mm +350°C
RS Stock No. 893-0937
Mfr. Part No.E300KR16E
BrandOhmite
MYR201.02
Each
units
160 mΩ ±10% 300W ±400ppm/°C - - - Bolt On, Bracket Vitreous Enamel E300 28.58 x 215.9mm 28.58mm 215.9mm +400°C
RS Stock No. 892-4721
Mfr. Part No.D100K1R0E
BrandOhmite
MYR120.57
Each
units
1 Ω ±10% 100W ±260ppm/°C - - - Bolt On, Bracket Vitreous Enamel D100 19.1 x 165.1mm 19.1mm 165.1mm +350°C
RS Stock No. 161-7570
Mfr. Part No.ZC3/6-FT
BrandCressall
MYR593.19
Each
units
650 mΩ ±10% - - Screw - Wire Wound Bolt On - ZC - - 330mm +50°C
RS Stock No. 892-8335
Mfr. Part No.D100K2K5E
BrandOhmite
MYR105.56
Each
units
2.5 kΩ ±10% 100W ±260ppm/°C - - - Bolt On, Bracket Vitreous Enamel D100 19.1 x 165.1mm 19.1mm 165.1mm +350°C
RS Stock No. 788-7655
Mfr. Part No.RSSD25168AR470MB06
BrandVishay
MYR216.58
Each
units
470 mΩ ±20% 200W - Radial BA25 - Bolt On Vitreous Enamel RSSD 27 (Dia.) x 168mm 27mm 168mm +450°C
RS Stock No. 893-5092
Mfr. Part No.D100K100K
BrandOhmite
MYR92.27
Each (In a Pack of 25)
units
100 kΩ ±10% 100W ±260ppm/°C - - - Bolt On, Bracket Vitreous Enamel D100 19.1 x 165.1mm 19.1mm 165.1mm +350°C
RS Stock No. 893-5579
Mfr. Part No.D225K300-B
BrandOhmite
MYR62.575
Each (In a Pack of 50)
units
300 Ω ±10% 225W ±260ppm/°C - - - Bolt On, Bracket Vitreous Enamel D225 28.6 x 266.7mm 28.6mm 266.7mm +350°C
RS Stock No. 788-7790
Mfr. Part No.RSSD30250A47R0JB06
BrandVishay
MYR319.16
Each
units
47 Ω 5% 280W - Radial BA25 Wire Wound Bolt On Vitreous Enamel RSSD 32 (Dia.) x 250mm 32mm 250mm +450°C
RS Stock No. 892-6688
Mfr. Part No.D50K400E
BrandOhmite
MYR71.53
Each
units
400 Ω ±10% 50W ±260ppm/°C - - - Bolt On, Bracket Vitreous Enamel D50 14.3 x 101.6mm 14.3mm 101.6mm +350°C
RS Stock No. 788-7652
Mfr. Part No.RSSD25168AR220MB06
BrandVishay
MYR269.61
Each
units
220 mΩ ±20% 200W ±75ppm/°C Radial BA25 - Bolt On Vitreous Enamel RSSD 27 (Dia.) x 168mm 27mm 168mm +450°C
RS Stock No. 892-4904
Mfr. Part No.D25K2R0E
BrandOhmite
MYR65.36
Each
units
2 Ω ±10% 25W ±260ppm/°C - - - Bolt On, Bracket Vitreous Enamel D25 14.3 x 50.8mm 14.3mm 50.8mm +350°C
RS Stock No. 144-5509
Mfr. Part No.D50K75RE
MYR79.51
Each
units
75 Ω ±10% 50W ±260ppm/°C Solder - Wire Wound Bolt On Vitreous Enamel 210 14.3 (Dia.) x 101.6mm 14.3mm 101.6mm +350°C
RS Stock No. 893-5519
Mfr. Part No.D225K250E-B
BrandOhmite
MYR61.136
Each (In a Pack of 50)
units
250 Ω ±10% 225W ±260ppm/°C - - - Bolt On, Bracket Vitreous Enamel D225 28.6 x 266.7mm 28.6mm 266.7mm +350°C
RS Stock No. 892-4907
Mfr. Part No.D25K50RE
BrandOhmite
MYR61.31
Each
units
50 Ω ±10% 25W ±260ppm/°C - - - Bolt On, Bracket Vitreous Enamel D25 14.3 x 50.8mm 14.3mm 50.8mm +350°C
RS Stock No. 892-4872
Mfr. Part No.D25K1R0E
BrandOhmite
MYR61.92
Each
units
1 Ω ±10% 25W ±260ppm/°C - - - Bolt On, Bracket Vitreous Enamel D25 14.3 x 50.8mm 14.3mm 50.8mm +350°C
RS Stock No. 892-5755
Mfr. Part No.D25K3R0E
BrandOhmite
MYR61.31
Each
units
3 Ω ±10% 25W ±260ppm/°C - - - Bolt On, Bracket Vitreous Enamel D25 14.3 x 50.8mm 14.3mm 50.8mm +350°C