Rheostats

A rheostat is a variable resistor used to control current or vary resistance within an electrical circuit, without interrupting the circuit itself. Unlike potentiometers, a rheostat is specifically designed to handle higher current loads. As such, it’s suitable for motor speed control, lighting control, and similar applications. Moreover, some buyers search for a rheostat switch when looking for an adjustable current-control device, rather than a standalone switch.

RS Australia stocks rheostats from trusted brands including Vishay, Arcol Ohmite, and Ohmite. For a deeper look at how these devices work, check out our comprehensive rheostats guide.

Browse the full range of rheostats and find the right product for your electrical circuits today.

Key Uses of Rheostats

A rheostat variable resistor is a practical solution across a range of higher-current control applications, including:

• Manual Current Adjustment: A rheostat allows smooth, continuous adjustment of current in a live circuit without interrupting operation, giving engineers control over electrical output.
• Higher-Current Applications: Unlike standard potentiometers, a high-power rheostat is built to handle elevated current loads, making it the preferred choice for demanding industrial and commercial applications.
• Motor Speed and Load Control: Rheostats are widely used in motor speed control, variable load adjustment, and dimmer-style control across manufacturing and processing equipment.
• Fine-Tuning Resistance: A rheostat resistor enables operators to fine-tune resistance incrementally, supporting accurate calibration and process control without circuit interruption.

Shop Our Range of Rheostats

RS Australia stocks a broad selection of rheostats to suit both standard and demanding electrical control requirements. Whether you need a wire-wound rheostat resistor for reliable panel-mount use or a high-power rheostat built for rugged industrial environments, you will find the right variable resistor here.

Wirewound Rheostats

Wirewound rheostats feature resistive wire wound around an insulating ceramic core, delivering consistent, repeatable resistance adjustment under load. A high-power rheostat of this type is built to handle elevated currents reliably, making it a strong choice for industrial motor speed control, power regulation, and panel-mount applications. If you prioritise durability and stable power handling, this option will provide you with a long service life in demanding conditions.

Linear Rheostats

Slide or linear rheostats use a sliding contact that moves along a straight resistive element, enabling smooth, incremental current adjustment along a linear path. This variable resistor is well-suited to laboratory testing, educational setups, and controlled adjustment environments where precise, repeatable resistance changes are required. Additionally, the straightforward sliding mechanism makes linear rheostats easy to operate and calibrate, supporting accurate results in technical and research applications across Australia.

How to Choose the Right Rheostat for Your Needs

Selecting the right rheostat requires careful consideration of your application requirements. Key factors include:

• Resistance Range: Confirm the required minimum and maximum resistance values suit your circuit design.
• Power Rating and Wattage: Match the rheostat resistor wattage to your application, particularly for high-current environments requiring a high-power rheostat.
• Current and Voltage Demands: Ensure the device handles your circuit's operating current and voltage without exceeding rated limits.
• Product Type: Choose between standard rotary, linear, or wirewound rheostat variable resistor formats based on your control requirements.
• Brand Preference: Consider established options from Ohmite and other trusted manufacturers for quality assurance.
• Mount Type and Termination: Specify panel mount configurations and termination style, such as solder or solder lug, to suit your enclosure.
• Physical Dimensions: Account for shaft diameter, shaft length, and overall dimensions when fitting into existing assemblies.
• Tolerance and Taper: Evaluate tolerance ratings and taper characteristics where consistent rheostat switch-style control is required.

Common Industry Applications

Rheostats are used across a broad range of industrial, commercial, and technical environments in Australia, such as:

• Motor Speed Control: A rheostat variable resistor provides smooth, adjustable control over motor speed in manufacturing and processing equipment.
• Dimmers and Adjustable Power Circuits: Rheostats enable variable output in lighting and power distribution systems.
• Heaters and Ovens: A high-power rheostat supports temperature regulation in industrial heating applications.
• Laboratory and Testing Setups: Rheostat resistors are a staple in test benches requiring adjustable resistance.
• Teaching and Training Environments: Linear rheostats are widely used in educational settings to demonstrate circuit behaviour.
• Equipment Calibration and Maintenance: Rheostats assist in variable-resistance adjustment during equipment servicing and design workflows.

Your Trusted Rheostats Supplier & Manufacturer in Australia

RS Australia offers a curated range of durable, standards-compliant rheostats from trusted brands like Vishay, Arcol Ohmite, and Ohmite, backed by technical support and reliable service. Our secure online platform makes ordering straightforward, with clear product specifications and stock availability visible at a glance.

You can also consolidate your purchase by adding products such as dimmable LED drivers, temperature control switches, and circuit breakers in a single order. And when you order your rheostats from us, you can expect quick and efficient delivery across Australia. For full details on delivery schedules and rates, visit our Delivery page.