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庫存編號 788-7719
製造零件編號RT055AS3300KB
BrandVishay
HK$1,747.54
單位
330Ω ±10% 55W 1 Panel Mount 6 mm 10.5mm Solder Lug 60 (Dia.) x 64mm - - 64mm +320°C -
RS庫存編號 891-5424
製造零件編號RHS3R0E
HK$344.50
單位
±10% 25W 300 ° Panel Mount 6.35 mm - Solder Lug 39.62 (Dia.) x 34.93mm - - 34.93mm - Linear Shaft
RS庫存編號 891-5345
製造零件編號RES3R0E
HK$227.90
單位
±10% 12.5W 300 ° Panel Mount 3.18 mm - Solder Lug 22.23 (Dia.) x 17.46mm - - 17.46mm - Linear Shaft
RS庫存編號 891-5584
製造零件編號RLS10RE
BrandOhmite
HK$715.54
單位
10Ω ±10% 150W 300 ° Panel Mount 6.35 mm - Solder Lug 101.6 (Dia.) x 50.8mm - - 50.8mm - Linear Shaft
RS庫存編號 891-5341
製造零件編號RES3K5E
HK$350.292
/個 (每包:5個)
單位
3.5kΩ ±10% 12.5W 300 ° Panel Mount 3.18 mm - Solder Lug 22.23 (Dia.) x 17.46mm - - 17.46mm - Linear Shaft
RS庫存編號 788-7829
製造零件編號RT025AS2R20KB
BrandVishay
HK$551.00
單位
2.2Ω ±10% 25W 1 Panel Mount 6 mm 10.5mm Solder Lug 38 (Dia.) x 50mm - - 50mm +320°C -
RS庫存編號 788-7706
製造零件編號RT055AS22R0KB
BrandVishay
HK$1,306.04
單位
22Ω ±10% 55W 1 Panel Mount 6 mm 10.5mm Solder Lug 60 (Dia.) x 64mm - - 64mm +320°C -
RS庫存編號 891-5332
製造零件編號RES250E
HK$246.56
單位
250Ω ±10% 12.5W 300 ° Panel Mount 3.18 mm - Solder Lug 22.23 (Dia.) x 17.46mm - - 17.46mm - Linear Shaft
RS庫存編號 892-8271
製造零件編號RJS1K6E
BrandOhmite
HK$393.07
單位
1.6kΩ ±10% 50W 300 ° Panel Mount 6.35 mm - Solder Lug 58.67 (Dia.) x 34.93mm - - 34.93mm - Linear Shaft
RS庫存編號 2509031132
製造零件編號232P21
BrandOhmite
HK$533.26
單位
- - - - - - - - - - - - - -
RS庫存編號 2509192647
製造零件編號RKS300E
BrandOhmite
HK$824.18
單位
- - - - - - - - - - - - - -
RS庫存編號 2508305924
製造零件編號232P19
BrandOhmite
HK$661.36
單位
- - - - - - - - - - - - - -
RS庫存編號 2509192940
製造零件編號RNS2R0E
BrandOhmite
HK$1,893.64
單位
- - - - - - - - - - - - - -