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. 168-0118
Mfr. Part No.RT025AS15R0KB
BrandVishay
SGD170.085
Each (In a Pack of 25)
units
15Ω ±10% 25W 1 Panel Mount 6 mm 10.5mm Solder Lug 38 (Dia.) x 50mm - - 50mm +320°C -
RS Stock No. 891-5442
Mfr. Part No.RHS750E
SGD97.08
Each
units
750Ω ±10% 25W 300 ° Panel Mount 6.35 mm - Solder Lug 39.62 (Dia.) x 34.93mm - - 34.93mm - Linear Shaft
RS Stock No. 788-7706
Mfr. Part No.RT055AS22R0KB
BrandVishay
SGD436.04
Each
units
22Ω ±10% 55W 1 Panel Mount 6 mm 10.5mm Solder Lug 60 (Dia.) x 64mm - - 64mm +320°C -
RS Stock No. 144-5529
Mfr. Part No.RHS50RE
SGD102.65
Each
units
50Ω 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. 2509192647
Mfr. Part No.RKS300E
BrandOhmite
SGD128.93
Each
units
- - - - - - - - - - - - - -
RS Stock No. 2509192940
Mfr. Part No.RNS2R0E
BrandOhmite
SGD296.22
Each
units
- - - - - - - - - - - - - -
RS Stock No. 2509031132
Mfr. Part No.232P21
BrandOhmite
SGD83.42
Each
units
- - - - - - - - - - - - - -
RS Stock No. 2508305924
Mfr. Part No.232P19
BrandOhmite
SGD103.46
Each
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- - - - - - - - - - - - - -
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