Rheostats

A rheostat is a variable resistor which is used to control current within an electrical circuit. They are able to vary the resistance in a circuit without interruption. Rheostats are very similar in construction to potentiometers.
How Rheostats Operate
Rheostats use two connections, even when 3 terminals are present, the first connection is made to one end of the resistive element and the other connection to the wiper (sliding contact). Resistive wire is wound around an insulating ceramic core, as the wiper slides over the windings the resistance, and therefore current, produced is altered.
Rheostat Types
Several types of rheostats exist, with varying functions and applications.
• Rotary type – Mostly used in power control applications. Rotary rheostats feature a turnable shaft that adjusts the resistance. They are used to control multiple applications in parallel or to increase the power rating or adjusting range.
• Slide type – Slide rheostats are often used for education and in laboratory environments. Linear or slide types are constructed of resistive wire wound on an insulating cylinder, a sliding contact moves along the winding to increase or decrease the resistance.

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Description Price Maximum Resistance Tolerance Power Rating Number of Turns Mounting Type Shaft Diameter Mounting Hole Diameter Termination Style Dimensions Depth Height Length Maximum Operating Temperature Actuator Type
RS Stock No. 891-5398
Mfr. Part No.RHS1K0E
TWD1,695.00
Each
units
1kΩ ±10% 25W 300 ° Panel Mount 6.35 mm - Solder Lug 39.62 (Dia.) x 34.93mm - - 34.93mm - Linear Shaft
RS Stock No. 891-5363
Mfr. Part No.RES75RE
TWD1,825.00
Each
units
75Ω ±10% 12.5W 300 ° Panel Mount 3.18 mm - Solder Lug 22.23 (Dia.) x 17.46mm - - 17.46mm - Linear Shaft
RS Stock No. 893-4279
Mfr. Part No.RHL5K0E
BrandOhmite
TWD2,356.00
Each
units
5kΩ ±10% 25W 300 ° Panel Mount 6.35 mm - Solder Lug 39.62 (Dia.) x 34.93mm - - 34.93mm - Linear Shaft
RS Stock No. 891-5446
Mfr. Part No.RHS75RE
TWD2,144.00
Each
units
75Ω ±10% 25W 300 ° Panel Mount 6.35 mm - Solder Lug 39.62 (Dia.) x 34.93mm - - 34.93mm - Linear Shaft
RS Stock No. 168-0124
Mfr. Part No.RT025AS4701KB
BrandVishay
TWD2,428.00
Each (In a Pack of 25)
units
4.7kΩ ±10% 25W 1 Panel Mount 6 mm 10.5mm Solder Lug 38 (Dia.) x 50mm - - 50mm +320°C -
RS Stock No. 891-5424
Mfr. Part No.RHS3R0E
TWD1,690.00
Each
units
±10% 25W 300 ° Panel Mount 6.35 mm - Solder Lug 39.62 (Dia.) x 34.93mm - - 34.93mm - Linear Shaft
RS Stock No. 167-9894
Mfr. Part No.RT100AS22R0KB
BrandVishay
TWD7,720.20
Each (In a Pack of 25)
units
22Ω ±10% 100W 1 Panel Mount 6 mm 10.5mm Solder Lug 85 (Dia.) x 81mm - - 81mm +320°C -
RS Stock No. 144-5522
Mfr. Part No.RES50RE
TWD1,635.00
Each
units
50Ω 10% 12.5W 300 ° Panel Mount 3.18 mm - Solder 22.23 (Dia.) x 17.46mm 22.23 (Dia.)mm - 17.46mm - Linear Shaft
RS Stock No. 891-5616
Mfr. Part No.RNS100E
BrandOhmite
TWD9,497.00
Each
units
100Ω ±10% 300W 320 ° Panel Mount 9.53 mm - Solder Lug 152.4 (Dia.) x 60.33mm - - 60.33mm - Linear Shaft
RS Stock No. 891-5593
Mfr. Part No.RLS250E
BrandOhmite
TWD5,062.00
Each
units
250Ω ±10% 150W 300 ° Panel Mount 6.35 mm - Solder Lug 101.6 (Dia.) x 50.8mm - - 50.8mm - Linear Shaft
RS Stock No. 891-5506
Mfr. Part No.RJS4R0E
BrandOhmite
TWD3,200.00
Each
units
±10% 50W 300 ° Panel Mount 6.35 mm - Solder Lug 58.67 (Dia.) x 34.93mm - - 34.93mm - Linear Shaft
RS Stock No. 892-2469
Mfr. Part No.RUS50RE
BrandOhmite
TWD30,245.00
Each
units
50Ω ±10% 1kW 335 ° Panel Mount 9.53 mm - Solder Lug 304.8 (Dia.) x 76.2mm - - 76.2mm - Linear Shaft
RS Stock No. 891-5405
Mfr. Part No.RHS250E
TWD2,075.00
Each
units
250Ω ±10% 25W 300 ° Panel Mount 6.35 mm - Solder Lug 39.62 (Dia.) x 34.93mm - - 34.93mm - Linear Shaft
RS Stock No. 891-5597
Mfr. Part No.RLS25RE
BrandOhmite
TWD4,699.00
Each
units
25Ω ±10% 150W 300 ° Panel Mount 6.35 mm - Solder Lug 101.6 (Dia.) x 50.8mm - - 50.8mm - Linear Shaft
RS Stock No. 892-2416
Mfr. Part No.RRS125E
BrandOhmite
TWD15,031.00
Each
units
125Ω ±10% 500W 325 ° Panel Mount 9.53 mm - Solder Lug 203.2 (Dia.) x 53.98mm - - 53.98mm - Linear Shaft
RS Stock No. 891-5509
Mfr. Part No.RJS500E
TWD2,434.00
Each
units
500Ω ±10% 50W 300 ° Panel Mount 6.35 mm - Solder Lug 58.67 (Dia.) x 34.93mm - - 34.93mm - Linear Shaft
RS Stock No. 891-5455
Mfr. Part No.RHS8R0E
BrandOhmite
TWD2,246.00
Each
units
±10% 25W 300 ° Panel Mount 6.35 mm - Solder Lug 39.62 (Dia.) x 34.93mm - - 34.93mm - Linear Shaft
RS Stock No. 788-7826
Mfr. Part No.RT025AS22R0KB
BrandVishay
TWD3,290.00
Each
units
22Ω ±10% 25W 1 Panel Mount 6 mm 10.5mm Solder Lug 38 (Dia.) x 50mm - - 50mm +320°C -
RS Stock No. 891-5499
Mfr. Part No.RJS300E
BrandOhmite
TWD2,556.00
Each
units
300Ω ±10% 50W 300 ° Panel Mount 6.35 mm - Solder Lug 58.67 (Dia.) x 34.93mm - - 34.93mm - Linear Shaft
RS Stock No. 144-5540
Mfr. Part No.RLS15RE
TWD4,249.00
Each
units
15Ω 10% 150W 300 ° Panel Mount 6.35 mm - Solder 101.6 (Dia.) x 50.8mm 101.6 (Dia.)mm - 50.8mm - Linear Shaft