30 Ohm 200W Adjustable Industrial Resistor | 250mm Tubular Rheostat

We offer a 30 Ohm 200W Adjustable Resistor of industrial origin (OEM Surplus). This component has been recovered from high-end automation equipment and is designed to withstand continuous workloads where thermal stability is critical.

Unlike lightweight commercial resistors, this unit features an oversized 33mm diameter, providing a greater heat dissipation surface and superior thermal inertia. Its special black coating not only protects the winding against oxidation, but also maximizes heat transfer through radiation.

Technical Data and Specifications

• Component Type: Wirewound Power Resistor

• ΩNominal Value: 30 ohm ±4%

• Valor Medido: 30.4 ΩVerificado en laboratorio, ver fotos).

• Measured Value: 30.4Ω ±4% (Laboratory verified, see photos)

• Maximum Operating Current: 2.58 Amperes

• Adjustability: Yes. Includes a sliding clamp (wiper) to regulate the resistance value (rheostat or power potentiometer functionality).

• Connections: Screw terminals with included nuts, ready for ring terminals.

Physical Dimensions of the 30 Ohm 200W Industrial Adjustable Resistor:

• Body Length: 250 mm

• Outer Diameter: 33 mm

• Weight: Heavy-duty construction with a solid core

Condition of the 30 Ohm 200W Industrial Adjustable Resistor

• Condition: Used (Industrial Surplus)

• Functionality Test: 100% tested. The winding continuity is perfect across the entire resistive track.

• Cosmetic Condition: Shows signs of industrial use, including surface scratches on the coating and normal oxidation on the terminal screws, which do not affect its electrical performance in any way.

• Included Accessory: Guaranteed to include the adjustment clamp/slider (not shown in the main photos but included in the package).

Applications & Use Cases
This 30Ω 200W adjustable resistor is ideal for a wide range of engineering and industrial applications:

1. Electronics Laboratories: Ideal as a variable load for testing 12V, 24V, or 48V power supplies.

2. DC Motor Control: Speed regulation for direct current motors (within the 2.5A range).

3. Dynamic Braking: Dissipation of regenerative energy in variable frequency drives (VFDs) or servo motors.

4. Battery Discharge: For capacity testing in battery banks.

Q: I don’t see the sliding adjustment piece in the photos. Is it included?
A: Yes, absolutely. Although it is not shown in the photos due to logistical reasons at the time they were taken, we guarantee that the resistor is shipped with its original compatible sliding clamp (slider), ready to be used as a variable resistor.

Q: The multimeter in the photo shows 30.4 ohms, but the title says 30. Is it defective?
A: No, quite the opposite. Power resistors have a standard tolerance (generally… ±5% o ±10%). A reading of 30.4 $\Omega$is extremely precise for a nominal 30Ω resistor Ωand confirms the component is functioning properly.

Q: What power rating can it actually handle? I don’t see a marking.
A: Based on its physical dimensions (250mm x 33mm) and ceramic core construction, it corresponds to the industrial standard of 200 watts. It can operate continuously, efficiently dissipating heat thanks to its dark coating.

Q: What are the screws at the ends for?
A: They are the fixed connection terminals. They include nuts and lock washers to securely fasten thick-gauge wires or ring terminals, ensuring a solid electrical connection capable of handling high currents.

Q: Can I use it to test batteries?
A: Yes. It is excellent for creating a controlled discharge load for deep-cycle batteries or solar systems, as long as the current does not exceed 2.5 amperes.