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. 795-4847
Mfr. Part No.RT025AS2201KB
BrandVishay
SGD146.19
Each
units
2.2kΩ ±10% 25W 1 Panel Mount 6 mm 10.5mm Solder Lug 38 Dia.x 50mm 50mm - 38 (Dia.)mm +320°C -
RS Stock No. 167-8618
Mfr. Part No.RT025AS2201KB
BrandVishay
SGD130.664
Each (In a Pack of 25)
units
2.2kΩ ±10% 25W 1 Panel Mount 6 mm 10.5mm Solder Lug 38 Dia.x 50mm 50mm - 38 (Dia.)mm +320°C -
RS Stock No. 827-6413
Mfr. Part No.VRH320 100R K
BrandArcol
SGD262.35
Each
units
100Ω - - - Surface Mount - - Solder Lug 446 x 93 x 150mm 93mm 150mm 446mm - Slide
RS Stock No. 891-5354
Mfr. Part No.RES500E
SGD79.78
Each
units
500Ω ±10% 12.5W 300 ° Panel Mount 3.18 mm - Solder Lug 22.23 (Dia.) x 17.46mm - - 17.46mm - Linear Shaft
RS Stock No. 788-7823
Mfr. Part No.RT025AS4701KB
BrandVishay
SGD124.76
Each
units
4.7kΩ ±10% 25W 1 Panel Mount 6 mm 10.5mm Solder Lug 38 (Dia.) x 50mm - - 50mm +320°C -
RS Stock No. 892-2434
Mfr. Part No.RRS2K5E
BrandOhmite
SGD513.864
Each (In a Pack of 5)
units
2.5kΩ ±10% 500W 325 ° Panel Mount 9.53 mm - Solder Lug 203.2 (Dia.) x 53.98mm - - 53.98mm - Linear Shaft
RS Stock No. 144-5537
Mfr. Part No.RKS10RE
SGD143.92
Each
units
10Ω 10% 100W 300 ° Panel Mount 6.35 mm - Solder 79.38 (Dia.) x 44.45mm 79.38 (Dia.)mm - 44.45mm - Linear Shaft
RS Stock No. 168-0124
Mfr. Part No.RT025AS4701KB
BrandVishay
SGD102.273
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. 891-5593
Mfr. Part No.RLS250E
BrandOhmite
SGD213.24
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. 891-5455
Mfr. Part No.RHS8R0E
BrandOhmite
SGD94.62
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. 893-4702
Mfr. Part No.RLS35RE
BrandOhmite
SGD220.89
Each
units
35Ω ±10% 150W 300 ° Panel Mount 6.35 mm - Solder Lug 101.6 (Dia.) x 50.8mm - - 50.8mm - Linear Shaft
RS Stock No. 891-5578
Mfr. Part No.RKS7R5E
BrandOhmite
SGD171.30
Each
units
7.5Ω ±10% 100W 300 ° Panel Mount 6.35 mm - Solder Lug 79.38 (Dia.) x 44.45mm - - 44.45mm - Linear Shaft
RS Stock No. 891-5499
Mfr. Part No.RJS300E
BrandOhmite
SGD107.68
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. 144-5530
Mfr. Part No.RHS5K0E
SGD74.32
Each
units
5kΩ 10% 25W 300 ° Panel Mount 6.35 mm - Solder 39.62 (Dia.) x 34.93mm 39.62 (Dia.)mm - 34.93mm - Linear Shaft
RS Stock No. 891-5604
Mfr. Part No.RLS50RE
BrandOhmite
SGD224.17
Each
units
50Ω ±10% 150W 300 ° Panel Mount 6.35 mm - Solder Lug 101.6 (Dia.) x 50.8mm - - 50.8mm - Linear Shaft
RS Stock No. 891-5597
Mfr. Part No.RLS25RE
BrandOhmite
SGD197.92
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. 144-5532
Mfr. Part No.RJS1K0E
SGD104.45
Each
units
1kΩ 10% 50W 300 ° Panel Mount 6.35 mm - Solder 58.67 (Dia.) x 34.93mm 58.67 (Dia.)mm - 34.93mm - Linear Shaft
RS Stock No. 891-5525
Mfr. Part No.RJS8R0E
BrandOhmite
SGD96.37
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. 788-7677
Mfr. Part No.RT500AS1001KB
BrandVishay
SGD1,893.91
Each
units
1kΩ ±10% 500W 1 Panel Mount 10 mm 12mm Solder Lug 143 (Dia.) x 158mm - - 158mm +320°C -
RS Stock No. 827-6397
Mfr. Part No.VRH320 33R K
BrandArcol
SGD214.09
Each
units
33Ω - - - Surface Mount - - Solder Lug 446 x 93 x 150mm 93mm 150mm 446mm - Slide
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